Annual report pursuant to Section 13 and 15(d)

EMPLOYEE BENEFIT PLANS - HEALTH CARE TREND RATES, EFFECTS OF ONE PERCENT CHANGE IN HEALTH CARE COST RATES AND EXPECTED BENEFIT PAYMENTS (Details)

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EMPLOYEE BENEFIT PLANS - HEALTH CARE TREND RATES, EFFECTS OF ONE PERCENT CHANGE IN HEALTH CARE COST RATES AND EXPECTED BENEFIT PAYMENTS (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Health care trend rate    
Health care trend rate (as a percent) 7.00% 7.00%
Ultimate health care trend rate (as a percent) 5.00% 5.00%
Expected benefit payments:    
Net transfer out of Level 3 assets due to a change in the significance of unobservable inputs for several investments $ 0  
Defined Benefit Plans | United States    
Projected benefit obligation in excess of plan assets    
Projected benefit obligation 1,153 $ 1,049
Fair value of plan assets 821 721
Accumulated benefit obligation in excess of plan assets    
Projected benefit obligation 1,153 1,049
Accumulated benefit obligation 1,127 1,022
Fair value of plan assets 821 721
2018 expected employer contributions:    
To plan trusts 51  
Expected benefit payments:    
2018 72  
2019 61  
2020 62  
2021 62  
2022 107  
2023 - 2027 370  
Defined Benefit Plans | Non-U.S. Defined Benefit Plans    
Projected benefit obligation in excess of plan assets    
Projected benefit obligation 1,213 2,050
Fair value of plan assets 815 1,623
Accumulated benefit obligation in excess of plan assets    
Projected benefit obligation 1,026 1,121
Accumulated benefit obligation 957 1,043
Fair value of plan assets 638 $ 721
2018 expected employer contributions:    
To plan trusts 38  
Expected benefit payments:    
2018 71  
2019 71  
2020 74  
2021 78  
2022 79  
2023 - 2027 428  
Other Postretirement Benefit Plans | United States    
2018 expected employer contributions:    
To plan trusts 7  
Expected benefit payments:    
2018 7  
2019 7  
2020 6  
2021 6  
2022 6  
2023 - 2027 $ 31