Annual report pursuant to Section 13 and 15(d)

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

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PENSION AND OTHER POSTRETIREMENT BENEFITS (Details 4) - Fair Value of Plan Assets - USD ($)
$ in Millions
1 Months Ended
Jul. 31, 2012
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
UNITED STATES        
Pension and other postretirement benefits        
Fair value of plan assets   $ 2,937 $ 3,166  
Pending Trade Purchases, Sales   9 (96)  
Accrued Investment Income Receivable [1]   5 12  
UNITED STATES | U.S. Equity        
Pension and other postretirement benefits        
Fair value of plan assets   77 102  
UNITED STATES | Non-U.S. Equity        
Pension and other postretirement benefits        
Fair value of plan assets   42 56  
UNITED STATES | Government debt        
Pension and other postretirement benefits        
Fair value of plan assets   38 691  
UNITED STATES | Domestic Corporate Debt Securities        
Pension and other postretirement benefits        
Fair value of plan assets   323 590  
UNITED STATES | Foreign Corporate Debt Securities        
Pension and other postretirement benefits        
Fair value of plan assets   15 73  
UNITED STATES | Asset-backed Securities        
Pension and other postretirement benefits        
Fair value of plan assets   5 78  
UNITED STATES | Net cash equivalents        
Pension and other postretirement benefits        
Fair value of plan assets [2]   192 75  
UNITED STATES | Derivative instruments        
Pension and other postretirement benefits        
Fair value of plan assets [3]     3  
UNITED STATES | Private Equity and Real Estate        
Pension and other postretirement benefits        
Fair value of plan assets [4]   316 246  
UNITED STATES | Fair Value, Inputs, Level 1        
Pension and other postretirement benefits        
Fair value of plan assets   294 208  
UNITED STATES | Fair Value, Inputs, Level 1 | U.S. Equity        
Pension and other postretirement benefits        
Fair value of plan assets   77 102  
UNITED STATES | Fair Value, Inputs, Level 1 | Non-U.S. Equity        
Pension and other postretirement benefits        
Fair value of plan assets   42 56  
UNITED STATES | Fair Value, Inputs, Level 1 | Net cash equivalents        
Pension and other postretirement benefits        
Fair value of plan assets [2]   175 50  
UNITED STATES | Significant other observable inputs Level 2        
Pension and other postretirement benefits        
Fair value of plan assets   398 1,460  
UNITED STATES | Significant other observable inputs Level 2 | Government debt        
Pension and other postretirement benefits        
Fair value of plan assets   38 691  
UNITED STATES | Significant other observable inputs Level 2 | Domestic Corporate Debt Securities        
Pension and other postretirement benefits        
Fair value of plan assets   323 590  
UNITED STATES | Significant other observable inputs Level 2 | Foreign Corporate Debt Securities        
Pension and other postretirement benefits        
Fair value of plan assets   15 73  
UNITED STATES | Significant other observable inputs Level 2 | Asset-backed Securities        
Pension and other postretirement benefits        
Fair value of plan assets   5 78  
UNITED STATES | Significant other observable inputs Level 2 | Net cash equivalents        
Pension and other postretirement benefits        
Fair value of plan assets [2]   17 25  
UNITED STATES | Significant other observable inputs Level 2 | Derivative instruments        
Pension and other postretirement benefits        
Fair value of plan assets [3]     3  
UNITED STATES | Fair Value, Inputs, Level 3        
Pension and other postretirement benefits        
Fair value of plan assets   316 246 $ 212
UNITED STATES | Fair Value, Inputs, Level 3 | Private Equity and Real Estate        
Pension and other postretirement benefits        
Fair value of plan assets [4]   316 246  
UNITED STATES | Fair Value, Inputs, Level 3 | Real estate        
Pension and other postretirement benefits        
Fair value of plan assets   69 66 64
UNITED STATES | Fair Value, Inputs, Level 1, 2 and 3        
Pension and other postretirement benefits        
Fair value of plan assets   1,008 1,914  
UNITED STATES | Fair Value Measured at Net Asset Value Per Share        
Pension and other postretirement benefits        
Fair value of plan assets   1,915 1,336  
UNITED STATES | Fair Value Measured at Net Asset Value Per Share | Government debt        
Pension and other postretirement benefits        
Fair value of plan assets   602 347  
UNITED STATES | Fair Value Measured at Net Asset Value Per Share | Asset-backed Securities        
Pension and other postretirement benefits        
Fair value of plan assets   2 103  
UNITED STATES | Fair Value Measured at Net Asset Value Per Share | Global Equities        
Pension and other postretirement benefits        
Fair value of plan assets   343 428  
UNITED STATES | Fair Value Measured at Net Asset Value Per Share | Corporate Debt Securities        
Pension and other postretirement benefits        
Fair value of plan assets   821 321  
UNITED STATES | Fair Value Measured at Net Asset Value Per Share | Real estate        
Pension and other postretirement benefits        
Fair value of plan assets   147 137  
UNITED KINGDOM        
Pension and other postretirement benefits        
Fair value of plan assets   1,782 1,960  
UNITED KINGDOM | U.S. Equity        
Pension and other postretirement benefits        
Fair value of plan assets   47 63  
UNITED KINGDOM | Non-U.S. Equity        
Pension and other postretirement benefits        
Fair value of plan assets   61 91  
UNITED KINGDOM | Net cash equivalents        
Pension and other postretirement benefits        
Fair value of plan assets [5]   12 29  
UNITED KINGDOM | Insurance Contract        
Pension and other postretirement benefits        
Insurance Contract Payment Deferment Period 10 years      
UNITED KINGDOM | Private Equity Real Estate and Insurance        
Pension and other postretirement benefits        
Fair value of plan assets [6]   686 671  
UNITED KINGDOM | Fair Value, Inputs, Level 1        
Pension and other postretirement benefits        
Fair value of plan assets   12 29  
UNITED KINGDOM | Fair Value, Inputs, Level 1 | Net cash equivalents        
Pension and other postretirement benefits        
Fair value of plan assets [5]   12 29  
UNITED KINGDOM | Significant other observable inputs Level 2        
Pension and other postretirement benefits        
Fair value of plan assets   108 154  
UNITED KINGDOM | Significant other observable inputs Level 2 | U.S. Equity        
Pension and other postretirement benefits        
Fair value of plan assets   47 63  
UNITED KINGDOM | Significant other observable inputs Level 2 | Non-U.S. Equity        
Pension and other postretirement benefits        
Fair value of plan assets   61 91  
UNITED KINGDOM | Fair Value, Inputs, Level 3        
Pension and other postretirement benefits        
Fair value of plan assets   686 671 613
UNITED KINGDOM | Fair Value, Inputs, Level 3 | Real estate        
Pension and other postretirement benefits        
Fair value of plan assets   57 59 $ 57
UNITED KINGDOM | Fair Value, Inputs, Level 3 | Insurance Contract        
Pension and other postretirement benefits        
Fair value of plan assets   442 477  
UNITED KINGDOM | Fair Value, Inputs, Level 3 | Private Equity Real Estate and Insurance        
Pension and other postretirement benefits        
Fair value of plan assets [6]   686 671  
UNITED KINGDOM | Fair Value, Inputs, Level 1, 2 and 3        
Pension and other postretirement benefits        
Fair value of plan assets   806 854  
UNITED KINGDOM | Fair Value Measured at Net Asset Value Per Share        
Pension and other postretirement benefits        
Fair value of plan assets   976 1,106  
UNITED KINGDOM | Fair Value Measured at Net Asset Value Per Share | Global Equities        
Pension and other postretirement benefits        
Fair value of plan assets   100 144  
UNITED KINGDOM | Fair Value Measured at Net Asset Value Per Share | Corporate Debt Securities        
Pension and other postretirement benefits        
Fair value of plan assets   753 822  
UNITED KINGDOM | Fair Value Measured at Net Asset Value Per Share | Reinsurance        
Pension and other postretirement benefits        
Fair value of plan assets   77 86  
UNITED KINGDOM | Fair Value Measured at Net Asset Value Per Share | Managed Futures Funds        
Pension and other postretirement benefits        
Fair value of plan assets   $ 46 $ 54  
[1] Accruals include interest or dividends that were not settled at December 31.
[2] Cash equivalents include commercial paper, short-term government/agency, mortgage and credit instruments.
[3] Derivative instruments include interest rate swaps and credit default swaps.
[4] The instruments in private equity and real estate, for which quoted market prices are not available, are valued at their estimated fair value as determined by applicable investment managers or by audited financial statements of the funds.
[5] Cash equivalents include commercial paper, short-term government/agency, mortgage and credit instruments.
[6] The instruments in private equity, real estate and insurance funds, for which quoted market prices are not available, are valued at their estimated fair value as determined by applicable investment managers or by audited financial statement of the funds.