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Pensions Benefit Plans and Other Postretirement Benefits - Changes in Fair Value of Pension Plan Assets (Details) - Pension Benefit Plans - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
U.S.    
Changes in fair value of pension plan assets    
Fair value at beginning of year $ 1,394 $ 1,654
Actual gain (loss) on plan assets (96) 254
Benefit payments (91) (128)
Employer contributions 1 7
Settlements (114) (393)
Net change in fair value of assets (300) (260)
Fair value at end of year 1,094 1,394
Non-U.S.    
Changes in fair value of pension plan assets    
Fair value at beginning of year 975 1,011
Actual gain (loss) on plan assets (15) 87
Benefit payments (51) (60)
Employer contributions 33 24
Participant contributions 2 1
Settlements (35) (171)
Foreign currency translation (58) 83
Other (8)  
Net change in fair value of assets (132) (36)
Fair value at end of year $ 843 $ 975