Annual report pursuant to Section 13 and 15(d)

COMPANY-SPONSORED EMPLOYEE BENEFIT PLANS COMPANY-SPONSORED EMPLOYEE BENEFIT PLANS - Effects of One Basis Point Change on Projected Benefit Obligation (Details)

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COMPANY-SPONSORED EMPLOYEE BENEFIT PLANS COMPANY-SPONSORED EMPLOYEE BENEFIT PLANS - Effects of One Basis Point Change on Projected Benefit Obligation (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2015
USD ($)
Pension Plan, Defined Benefit [Member]  
effects of one-basis point change one PBO [Line Items]  
Defined Benefit Plan, Effect of One Percentage Point Increase on Projected Benefit Obligation $ (60)
Defined Benefit Plan, Effect of One Percentage Point Decrease on Projected Benefit Obligation 66
Other Postretirement Benefit Plan, Defined Benefit [Member]  
effects of one-basis point change one PBO [Line Items]  
Defined Benefit Plan, Effect of One Percentage Point Increase on Projected Benefit Obligation (2)
Defined Benefit Plan, Effect of One Percentage Point Decrease on Projected Benefit Obligation 3
Change in Assumptions for Pension Plans | U.S. Pension Benefits  
effects of one-basis point change one PBO [Line Items]  
Defined Benefit Plan, Benefit Obligation, Period Increase (Decrease) 1,119
Change in Assumptions for Pension Plans | U.S. Postretirement Medical Benefits  
effects of one-basis point change one PBO [Line Items]  
Defined Benefit Plan, Benefit Obligation, Period Increase (Decrease) 51
Change in Assumptions for Pension Plans | Pension Plan, Defined Benefit [Member]  
effects of one-basis point change one PBO [Line Items]  
Defined Benefit Plan, Benefit Obligation, Period Increase (Decrease) 383
Change in Assumptions for Pension Plans | Other Postretirement Benefit Plan, Defined Benefit [Member]  
effects of one-basis point change one PBO [Line Items]  
Defined Benefit Plan, Benefit Obligation, Period Increase (Decrease) $ 234