Annual report pursuant to Section 13 and 15(d)

PENSION AND OTHER POSTRETIREMENT BENEFITS - (Details 5 ) - Level 3 Fair Value Reconciliation

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PENSION AND OTHER POSTRETIREMENT BENEFITS - (Details 5 ) - Level 3 Fair Value Reconciliation - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
U.S. PENSION PLAN      
Summary of changes in the fair value of level 3 assets      
Fair value of plan assets $ 3,357 $ 2,937 $ 3,166
U.S. PENSION PLAN | Fair Value, Inputs, Level 3      
Summary of changes in the fair value of level 3 assets      
Fair value of plan assets 371 316 246
Unrealized gains (losses) on assets still held at the reporting date 29 39  
Purchases, sales and settlements, net 26 31  
U.S. PENSION PLAN | Fair Value, Inputs, Level 3 | Private Markets      
Summary of changes in the fair value of level 3 assets      
Fair value of plan assets 299 247 180
Unrealized gains (losses) on assets still held at the reporting date 24 33  
Purchases, sales and settlements, net 28 34  
U.S. PENSION PLAN | Fair Value, Inputs, Level 3 | Real Assets      
Summary of changes in the fair value of level 3 assets      
Fair value of plan assets 72 69 66
Unrealized gains (losses) on assets still held at the reporting date 5 6  
Purchases, sales and settlements, net (2) (3)  
U.K. PENSION PLAN      
Summary of changes in the fair value of level 3 assets      
Fair value of plan assets 2,010 1,782 1,960
U.K. PENSION PLAN | Fair Value, Inputs, Level 3      
Summary of changes in the fair value of level 3 assets      
Fair value of plan assets 735 686 671
Unrealized gains (losses) on assets still held at the reporting date 53 (16)  
Purchases, sales and settlements, net (4) 31  
U.K. PENSION PLAN | Fair Value, Inputs, Level 3 | Private Markets      
Summary of changes in the fair value of level 3 assets      
Fair value of plan assets 224 187 135
Unrealized gains (losses) on assets still held at the reporting date 14 21  
Purchases, sales and settlements, net 23 31  
U.K. PENSION PLAN | Fair Value, Inputs, Level 3 | Real Assets      
Summary of changes in the fair value of level 3 assets      
Fair value of plan assets 35 57 59
Unrealized gains (losses) on assets still held at the reporting date 5 (2)  
Purchases, sales and settlements, net (27) 0  
U.K. PENSION PLAN | Fair Value, Inputs, Level 3 | Insurance      
Summary of changes in the fair value of level 3 assets      
Fair value of plan assets 476 442 $ 477
Unrealized gains (losses) on assets still held at the reporting date 34 (35)  
Purchases, sales and settlements, net $ 0 $ 0