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Pensions Benefit Plans and Other Postretirement Benefits - Funded Status (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Pension Benefit Plans | Minimum      
Defined Benefit Plan Disclosure      
Percentage of pension plan assets 10.00%    
U.S. | Pension Benefit Plans      
Defined Benefit Plan Disclosure      
Plan assets at fair value $ 1,215 $ 1,094 $ 1,394
Postretirement benefit obligations 1,505 1,413 1,650
Plan assets less than projected benefit obligations (290) (319)  
Items not yet recognized in pension expense and net postretirement benefit cost:      
Actuarial gain (loss) 722 785  
Total 722 785  
Net amount recognized 432 466  
U.S. | Other Postretirement Benefits      
Defined Benefit Plan Disclosure      
Postretirement benefit obligations 72 74 89
Items not yet recognized in pension expense and net postretirement benefit cost:      
Actuarial gain (loss) 1 (8)  
Prior service cost (credit) 8 15  
Total 9 7  
Net amount recognized (63) (67)  
Non-U.S. | Pension Benefit Plans      
Defined Benefit Plan Disclosure      
Plan assets at fair value 947 843 975
Postretirement benefit obligations 1,150 1,022 1,148
Plan assets less than projected benefit obligations (203) (179)  
Items not yet recognized in pension expense and net postretirement benefit cost:      
Actuarial gain (loss) 327 285  
Prior service cost (credit) 5 4  
Total 332 289  
Net amount recognized 129 110  
Non-U.S. | Other Postretirement Benefits      
Defined Benefit Plan Disclosure      
Postretirement benefit obligations 71 80 $ 89
Items not yet recognized in pension expense and net postretirement benefit cost:      
Actuarial gain (loss) (1) (2)  
Total (1) (2)  
Net amount recognized $ (72) $ (82)