Annual report pursuant to Section 13 and 15(d)

PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS (Details)

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PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Pension benefits      
Changes in benefit obligations      
Benefit obligation at January 1 $ 9,428 $ 9,159  
Service cost 197 239 $ 265
Interest cost 306 319  
Foreign currency exchange rate changes 150 (38)  
Amendments 1 17  
Actuarial loss (gain) 420 441  
Defined Benefit Plan, Benefit Obligation, Benefits Paid (341) (346)  
Divestitures (7) (16)  
Settlements (832) (384)  
Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Curtailment (10) 0  
Special termination benefits 106 37  
Other 37 0  
Benefit obligation at December 31 9,455 9,428 9,159
Fair value of plan assets      
Fair value of plan assets at January 1 8,371 7,689  
Actual return on plan assets 1,139 690  
Employer contributions 181 718  
Foreign currency exchange rate changes 196 (70)  
Benefits Paid (285) (270)  
Divestitures 0 (16)  
Settlements (794) (374)  
Other 35 4  
Fair value of plan assets at December 31 8,843 8,371 7,689
Net liability recognized (612) (1,057)  
Accumulated benefit obligation for pension plans 9,175 9,141  
Pension and other benefit amounts recognized in our consolidated balance sheets      
Noncurrent asset 921 572  
Current liability (72) (71)  
Long-term liability (1,461) (1,558)  
Net liability recognized (612) (1,057)  
Projected benefit obligations in excess of the fair value of plan assets      
Projected benefit obligation 7,833 7,907  
Fair value of plan assets 6,330 6,303  
Accumulated benefit obligations in excess of the fair value of plan assets      
Accumulated benefit obligation 7,614 7,668  
Fair value of plan assets 6,305 6,257  
Other benefits      
Changes in benefit obligations      
Benefit obligation at January 1 962 940  
Service cost 17 22 27
Interest cost 29 31  
Foreign currency exchange rate changes 4 (2)  
Amendments (21) (4)  
Actuarial loss (gain) (28) 20  
Defined Benefit Plan, Benefit Obligation, Benefits Paid (71) (64)  
Divestitures (66) (2)  
Settlements 0 0  
Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Curtailment (48) (17)  
Special termination benefits 0 2  
Other 4 36  
Benefit obligation at December 31 782 962 940
Fair value of plan assets      
Fair value of plan assets at January 1 255 245  
Actual return on plan assets 31 8  
Employer contributions 0 0  
Foreign currency exchange rate changes 0 0  
Benefits Paid (3) (3)  
Divestitures 0 0  
Settlements 0 0  
Other 5 5  
Fair value of plan assets at December 31 288 255 $ 245
Net liability recognized (494) (707)  
Pension and other benefit amounts recognized in our consolidated balance sheets      
Noncurrent asset 0 0  
Current liability (21) (23)  
Long-term liability (473) (684)  
Net liability recognized $ (494) (707)  
United States      
Defined Benefit Plan Disclosure      
Portion of projected pension benefit obligation represented by the defined benefit plan (as a percent) 64.00%    
Portion of projected pension plan assets represented by the defined benefit plan (as a percent) 65.00%    
Fair value of plan assets      
Fair value of plan assets at January 1 $ 6,061    
Fair value of plan assets at December 31 $ 6,028 $ 6,061