Annual report [Section 13 and 15(d), not S-K Item 405]

PENSION AND OTHER POSTRETIREMENT BENEFITS (Details 4) - Fair Value of Plan Assets

v3.25.4
PENSION AND OTHER POSTRETIREMENT BENEFITS (Details 4) - Fair Value of Plan Assets - USD ($)
$ in Millions
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
UNITED STATES      
Pension and other postretirement benefits      
Fair value of plan assets $ 3,789 $ 3,706 $ 3,826
Pending Trade Purchases, Sales (1) (2)  
Accrued Investment Income Receivable 7 12  
UNITED STATES | U.S. Equity      
Pension and other postretirement benefits      
Fair value of plan assets 68 168  
UNITED STATES | Non-U.S. Equity      
Pension and other postretirement benefits      
Fair value of plan assets 37 31  
UNITED STATES | Government debt      
Pension and other postretirement benefits      
Fair value of plan assets 57 105  
UNITED STATES | Domestic Corporate Debt Securities      
Pension and other postretirement benefits      
Fair value of plan assets 406 600  
UNITED STATES | Foreign Corporate Debt Securities      
Pension and other postretirement benefits      
Fair value of plan assets 23 36  
UNITED STATES | Asset-backed Securities      
Pension and other postretirement benefits      
Fair value of plan assets 3 13  
UNITED STATES | Net cash equivalents      
Pension and other postretirement benefits      
Fair value of plan assets 258 388  
UNITED STATES | Private markets and real assets (2)      
Pension and other postretirement benefits      
Fair value of plan assets 462 500  
UNITED STATES | Fair Value, Inputs, Level 1      
Pension and other postretirement benefits      
Fair value of plan assets 363 587  
UNITED STATES | Fair Value, Inputs, Level 1 | U.S. Equity      
Pension and other postretirement benefits      
Fair value of plan assets 68 168  
UNITED STATES | Fair Value, Inputs, Level 1 | Non-U.S. Equity      
Pension and other postretirement benefits      
Fair value of plan assets 37 31  
UNITED STATES | Fair Value, Inputs, Level 1 | Government debt      
Pension and other postretirement benefits      
Fair value of plan assets 0 0  
UNITED STATES | Fair Value, Inputs, Level 1 | Domestic Corporate Debt Securities      
Pension and other postretirement benefits      
Fair value of plan assets 0 0  
UNITED STATES | Fair Value, Inputs, Level 1 | Foreign Corporate Debt Securities      
Pension and other postretirement benefits      
Fair value of plan assets 0 0  
UNITED STATES | Fair Value, Inputs, Level 1 | Asset-backed Securities      
Pension and other postretirement benefits      
Fair value of plan assets 0 0  
UNITED STATES | Fair Value, Inputs, Level 1 | Net cash equivalents      
Pension and other postretirement benefits      
Fair value of plan assets 258 388  
UNITED STATES | Significant other observable inputs Level 2      
Pension and other postretirement benefits      
Fair value of plan assets 489 754  
UNITED STATES | Significant other observable inputs Level 2 | U.S. Equity      
Pension and other postretirement benefits      
Fair value of plan assets   0  
UNITED STATES | Significant other observable inputs Level 2 | Non-U.S. Equity      
Pension and other postretirement benefits      
Fair value of plan assets   0  
UNITED STATES | Significant other observable inputs Level 2 | Government debt      
Pension and other postretirement benefits      
Fair value of plan assets 57 105  
UNITED STATES | Significant other observable inputs Level 2 | Domestic Corporate Debt Securities      
Pension and other postretirement benefits      
Fair value of plan assets 406 600  
UNITED STATES | Significant other observable inputs Level 2 | Foreign Corporate Debt Securities      
Pension and other postretirement benefits      
Fair value of plan assets 23 36  
UNITED STATES | Significant other observable inputs Level 2 | Asset-backed Securities      
Pension and other postretirement benefits      
Fair value of plan assets 3 13  
UNITED STATES | Significant other observable inputs Level 2 | Net cash equivalents      
Pension and other postretirement benefits      
Fair value of plan assets 0 0  
UNITED STATES | Fair Value, Inputs, Level 3      
Pension and other postretirement benefits      
Fair value of plan assets 462 500 604
UNITED STATES | Fair Value, Inputs, Level 3 | Real Assets      
Pension and other postretirement benefits      
Fair value of plan assets 60 59 67
UNITED STATES | Fair Value, Inputs, Level 3 | Private markets and real assets (2)      
Pension and other postretirement benefits      
Fair value of plan assets 462 500  
UNITED STATES | Fair Value, Inputs, Level 1, 2 and 3      
Pension and other postretirement benefits      
Fair value of plan assets 1,314 1,841  
UNITED STATES | Fair Value Measured at Net Asset Value Per Share      
Pension and other postretirement benefits      
Fair value of plan assets 2,469 1,855  
UNITED STATES | Fair Value Measured at Net Asset Value Per Share | Government debt      
Pension and other postretirement benefits      
Fair value of plan assets 282 235  
UNITED STATES | Fair Value Measured at Net Asset Value Per Share | Asset-backed Securities      
Pension and other postretirement benefits      
Fair value of plan assets 338 327  
UNITED STATES | Fair Value Measured at Net Asset Value Per Share | Corporate Debt Securities      
Pension and other postretirement benefits      
Fair value of plan assets 912 912  
UNITED STATES | Fair Value Measured at Net Asset Value Per Share | Global Equities      
Pension and other postretirement benefits      
Fair value of plan assets 809 260  
UNITED STATES | Fair Value Measured at Net Asset Value Per Share | Real Assets      
Pension and other postretirement benefits      
Fair value of plan assets 128 121  
UNITED KINGDOM      
Pension and other postretirement benefits      
Fair value of plan assets 1,518 1,468 1,720
Pending Trade Purchases, Sales   1  
Accrued Investment Income Receivable 3 2  
UNITED KINGDOM | Government debt      
Pension and other postretirement benefits      
Fair value of plan assets 960 204  
UNITED KINGDOM | Domestic Corporate Debt Securities      
Pension and other postretirement benefits      
Fair value of plan assets 43 32  
UNITED KINGDOM | Foreign Corporate Debt Securities      
Pension and other postretirement benefits      
Fair value of plan assets 82 93  
UNITED KINGDOM | Net cash equivalents      
Pension and other postretirement benefits      
Fair value of plan assets 89 25  
UNITED KINGDOM | Derivative      
Pension and other postretirement benefits      
Fair value of plan assets (2)    
UNITED KINGDOM | Repurchase Agreements      
Pension and other postretirement benefits      
Fair value of plan assets (666)    
UNITED KINGDOM | Insurance      
Pension and other postretirement benefits      
Fair value of plan assets 698 383  
UNITED KINGDOM | Private markets and real assets (2)      
Pension and other postretirement benefits      
Fair value of plan assets 99 102  
UNITED KINGDOM | Fair Value, Inputs, Level 1      
Pension and other postretirement benefits      
Fair value of plan assets 26 11  
UNITED KINGDOM | Fair Value, Inputs, Level 1 | Net cash equivalents      
Pension and other postretirement benefits      
Fair value of plan assets 26 11  
UNITED KINGDOM | Significant other observable inputs Level 2      
Pension and other postretirement benefits      
Fair value of plan assets 480 343  
UNITED KINGDOM | Significant other observable inputs Level 2 | Government debt      
Pension and other postretirement benefits      
Fair value of plan assets 960 204  
UNITED KINGDOM | Significant other observable inputs Level 2 | Domestic Corporate Debt Securities      
Pension and other postretirement benefits      
Fair value of plan assets 43 32  
UNITED KINGDOM | Significant other observable inputs Level 2 | Foreign Corporate Debt Securities      
Pension and other postretirement benefits      
Fair value of plan assets 82 93  
UNITED KINGDOM | Significant other observable inputs Level 2 | Net cash equivalents      
Pension and other postretirement benefits      
Fair value of plan assets 63 14  
UNITED KINGDOM | Significant other observable inputs Level 2 | Derivative      
Pension and other postretirement benefits      
Fair value of plan assets (2)    
UNITED KINGDOM | Significant other observable inputs Level 2 | Repurchase Agreements      
Pension and other postretirement benefits      
Fair value of plan assets (666)    
UNITED KINGDOM | Fair Value, Inputs, Level 3      
Pension and other postretirement benefits      
Fair value of plan assets 797 485 539
UNITED KINGDOM | Fair Value, Inputs, Level 3 | Real Assets      
Pension and other postretirement benefits      
Fair value of plan assets 5 6 7
UNITED KINGDOM | Fair Value, Inputs, Level 3 | Insurance      
Pension and other postretirement benefits      
Fair value of plan assets 698 383 $ 436
UNITED KINGDOM | Fair Value, Inputs, Level 3 | Private markets and real assets (2)      
Pension and other postretirement benefits      
Fair value of plan assets 99 102  
UNITED KINGDOM | Fair Value, Inputs, Level 1, 2 and 3      
Pension and other postretirement benefits      
Fair value of plan assets 1,303 839  
UNITED KINGDOM | Fair Value Measured at Net Asset Value Per Share      
Pension and other postretirement benefits      
Fair value of plan assets 212 626  
UNITED KINGDOM | Fair Value Measured at Net Asset Value Per Share | Government debt      
Pension and other postretirement benefits      
Fair value of plan assets 0 434  
UNITED KINGDOM | Fair Value Measured at Net Asset Value Per Share | Asset-backed Securities      
Pension and other postretirement benefits      
Fair value of plan assets 0 92  
UNITED KINGDOM | Fair Value Measured at Net Asset Value Per Share | Corporate Debt Securities      
Pension and other postretirement benefits      
Fair value of plan assets 70 96  
UNITED KINGDOM | Fair Value Measured at Net Asset Value Per Share | Global Equities      
Pension and other postretirement benefits      
Fair value of plan assets 141 0  
UNITED KINGDOM | Fair Value Measured at Net Asset Value Per Share | Reinsurance      
Pension and other postretirement benefits      
Fair value of plan assets $ 1 $ 4