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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, 2019
Dec. 31, 2018
U.S.    
Changes in fair value of pension plan assets    
Fair value at beginning of year $ 1,094 $ 1,394
Actual gain (loss) on plan assets 235 (96)
Benefit payments (87) (91)
Employer contributions 8 1
Settlements (35) (114)
Net change in fair value of assets 121 (300)
Fair value at end of year 1,215 1,094
Non-U.S.    
Changes in fair value of pension plan assets    
Fair value at beginning of year 843 975
Actual gain (loss) on plan assets 110 (15)
Benefit payments (37) (51)
Employer contributions 25 33
Participant contributions 1 2
Settlements (44) (35)
Acquisitions 30  
Foreign currency translation 26 (58)
Other (7) (8)
Net change in fair value of assets 104 (132)
Fair value at end of year $ 947 $ 843