Annual report pursuant to Section 13 and 15(d)

PENSION AND OTHER POSTRETIREMENT BENEFITS - FAIR VALUE OF PLAN ASSETS (Details 4)

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PENSION AND OTHER POSTRETIREMENT BENEFITS - FAIR VALUE OF PLAN ASSETS (Details 4) - USD ($)
$ in Millions
1 Months Ended
Jul. 31, 2012
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
UNITED STATES        
Pension and other postretirement benefits        
Fair value of plan assets   $ 3,166 $ 2,751  
Total Fair Value of Defined Benefit Plan assets subject to leveling   1,914 1,738  
Pending Trade Purchases, Sales   (96) (83)  
Accrued Investment Income Receivable [1]   12 12  
Investments Net Asset Value   1,336 1,084  
UNITED STATES | U.S. Equity        
Pension and other postretirement benefits        
Fair value of plan assets   102 145  
UNITED STATES | Non-U.S. Equity        
Pension and other postretirement benefits        
Fair value of plan assets   56 125  
UNITED STATES | Global Equities        
Pension and other postretirement benefits        
Investments Net Asset Value   428 511  
UNITED STATES | US Treasury and Government        
Pension and other postretirement benefits        
Fair value of plan assets   691 570  
Investments Net Asset Value   347 178  
UNITED STATES | Domestic Corporate Debt Securities        
Pension and other postretirement benefits        
Fair value of plan assets   590 497  
UNITED STATES | Foreign Corporate Debt Securities        
Pension and other postretirement benefits        
Fair value of plan assets   73 84  
UNITED STATES | U.S. and non-U.S. corporate debt        
Pension and other postretirement benefits        
Investments Net Asset Value   321 265  
UNITED STATES | Real estate        
Pension and other postretirement benefits        
Investments Net Asset Value   137 129  
UNITED STATES | Asset-backed Securities        
Pension and other postretirement benefits        
Fair value of plan assets   78 58  
Investments Net Asset Value   103 1  
UNITED STATES | Cash Equivalents        
Pension and other postretirement benefits        
Fair value of plan assets [2]   75 38  
UNITED STATES | Derivative        
Pension and other postretirement benefits        
Fair value of plan assets [3]   3 9  
UNITED STATES | Private Equity and Real Estate        
Pension and other postretirement benefits        
Fair value of plan assets [4]   246 212  
UNITED STATES | Fair Value, Inputs, Level 1        
Pension and other postretirement benefits        
Fair value of plan assets   208 288  
UNITED STATES | Fair Value, Inputs, Level 1 | U.S. Equity        
Pension and other postretirement benefits        
Fair value of plan assets   102 145  
UNITED STATES | Fair Value, Inputs, Level 1 | Non-U.S. Equity        
Pension and other postretirement benefits        
Fair value of plan assets   56 125  
UNITED STATES | Fair Value, Inputs, Level 1 | Cash Equivalents        
Pension and other postretirement benefits        
Fair value of plan assets [2]   50 18  
UNITED STATES | Significant other observable inputs Level 2        
Pension and other postretirement benefits        
Fair value of plan assets   1,460 1,238  
UNITED STATES | Significant other observable inputs Level 2 | US Treasury and Government        
Pension and other postretirement benefits        
Fair value of plan assets   691 570  
UNITED STATES | Significant other observable inputs Level 2 | Domestic Corporate Debt Securities        
Pension and other postretirement benefits        
Fair value of plan assets   590 497  
UNITED STATES | Significant other observable inputs Level 2 | Foreign Corporate Debt Securities        
Pension and other postretirement benefits        
Fair value of plan assets   73 84  
UNITED STATES | Significant other observable inputs Level 2 | Asset-backed Securities        
Pension and other postretirement benefits        
Fair value of plan assets   78 58  
UNITED STATES | Significant other observable inputs Level 2 | Cash Equivalents        
Pension and other postretirement benefits        
Fair value of plan assets [2]   25 20  
UNITED STATES | Significant other observable inputs Level 2 | Derivative        
Pension and other postretirement benefits        
Fair value of plan assets [3]   3 9  
UNITED STATES | Fair Value, Inputs, Level 3        
Pension and other postretirement benefits        
Fair value of plan assets   246 212 $ 203
UNITED STATES | Fair Value, Inputs, Level 3 | Real estate        
Pension and other postretirement benefits        
Fair value of plan assets   66 64 60
UNITED STATES | Fair Value, Inputs, Level 3 | Private Equity and Real Estate        
Pension and other postretirement benefits        
Fair value of plan assets [4]   246 212  
UNITED KINGDOM        
Pension and other postretirement benefits        
Fair value of plan assets   1,960 1,753  
Total Fair Value of Defined Benefit Plan assets subject to leveling   854 1,004  
Investments Net Asset Value   1,106 749  
UNITED KINGDOM | U.S. Equity        
Pension and other postretirement benefits        
Fair value of plan assets   63 174  
UNITED KINGDOM | Non-U.S. Equity        
Pension and other postretirement benefits        
Fair value of plan assets   91 193  
UNITED KINGDOM | Global Equities        
Pension and other postretirement benefits        
Investments Net Asset Value   144 0  
UNITED KINGDOM | U.S. and non-U.S. corporate debt        
Pension and other postretirement benefits        
Investments Net Asset Value   822 655  
UNITED KINGDOM | Insurance Contract        
Pension and other postretirement benefits        
Insurance Contract Payment Deferment Period 10 years      
UNITED KINGDOM | Cash Equivalents        
Pension and other postretirement benefits        
Fair value of plan assets [5]   29 24  
UNITED KINGDOM | Private Equity Real Estate and Insurance        
Pension and other postretirement benefits        
Fair value of plan assets [6]   671 613  
UNITED KINGDOM | Reinsurance        
Pension and other postretirement benefits        
Investments Net Asset Value   86 56  
UNITED KINGDOM | Managed Futures Funds        
Pension and other postretirement benefits        
Investments Net Asset Value   54 38  
UNITED KINGDOM | Fair Value, Inputs, Level 1        
Pension and other postretirement benefits        
Fair value of plan assets   29 24  
UNITED KINGDOM | Fair Value, Inputs, Level 1 | Cash Equivalents        
Pension and other postretirement benefits        
Fair value of plan assets [5]   29 24  
UNITED KINGDOM | Significant other observable inputs Level 2        
Pension and other postretirement benefits        
Fair value of plan assets   154 367  
UNITED KINGDOM | Significant other observable inputs Level 2 | U.S. Equity        
Pension and other postretirement benefits        
Fair value of plan assets   63 174  
UNITED KINGDOM | Significant other observable inputs Level 2 | Non-U.S. Equity        
Pension and other postretirement benefits        
Fair value of plan assets   91 193  
UNITED KINGDOM | Fair Value, Inputs, Level 3        
Pension and other postretirement benefits        
Fair value of plan assets   671 613 601
UNITED KINGDOM | Fair Value, Inputs, Level 3 | Real estate        
Pension and other postretirement benefits        
Fair value of plan assets   59 57 $ 57
UNITED KINGDOM | Fair Value, Inputs, Level 3 | Insurance Contract        
Pension and other postretirement benefits        
Fair value of plan assets   477 439  
UNITED KINGDOM | Fair Value, Inputs, Level 3 | Private Equity Real Estate and Insurance        
Pension and other postretirement benefits        
Fair value of plan assets [6]   $ 671 $ 613  
[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, 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 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.