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, 2018
Dec. 31, 2017
Health care trend rate    
Health care trend rate (as a percent) 6.75% 6.75%
Ultimate health care trend rate (as a percent) 5.00% 5.00%
Effects of one-percent-point change in assumed health care cost trend rates    
Effect on postretirement benefit obligation, Increase $ 1  
Effect on postretirement benefit obligation, Decrease (2)  
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 1,080 $ 1,153
Fair value of plan assets 767 821
Accumulated benefit obligation in excess of plan assets    
Projected benefit obligation 1,080 1,153
Accumulated benefit obligation 1,057 1,127
Fair value of plan assets 767 821
2018 expected employer contributions:    
To plan trusts 50  
Expected benefit payments:    
2018 72  
2019 63  
2020 63  
2021 67  
2022 114  
2023 - 2027 376  
Defined Benefit Plans | Non-U.S. Defined Benefit Plans    
Projected benefit obligation in excess of plan assets    
Projected benefit obligation 1,790 1,213
Fair value of plan assets 1,375 815
Accumulated benefit obligation in excess of plan assets    
Projected benefit obligation 986 1,026
Accumulated benefit obligation 919 957
Fair value of plan assets 608 $ 638
2018 expected employer contributions:    
To plan trusts 38  
Expected benefit payments:    
2018 69  
2019 69  
2020 73  
2021 75  
2022 80  
2023 - 2027 428  
Other Postretirement Benefit Plans | United States    
2018 expected employer contributions:    
To plan trusts 6  
Expected benefit payments:    
2018 6  
2019 6  
2020 6  
2021 6  
2022 6  
2023 - 2027 $ 30