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Pensions Benefit Plans and Other Postretirement Benefits - Funded Status (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Pension Benefit Plans | Minimum      
Defined Benefit Plan Disclosure      
Percentage of pension plan assets 10.00%    
Pension Benefit Plans | U.S. | Funded Plan      
Defined Benefit Plan Disclosure      
Plan assets at fair value $ 1,324 $ 1,215 $ 1,094
Projected benefit obligations 1,590 1,505 1,413
Plan assets less than projected benefit obligations (266) (290)  
Items not yet recognized in pension expense and net postretirement benefit cost:      
Actuarial gain (loss) 708 722  
Total 708 722  
Net amount recognized 442 432  
Pension Benefit Plans | Non-U.S. | Funded Plan      
Defined Benefit Plan Disclosure      
Plan assets at fair value 929 947 843
Projected benefit obligations 1,127 1,150 1,022
Plan assets less than projected benefit obligations (198) (203)  
Items not yet recognized in pension expense and net postretirement benefit cost:      
Actuarial gain (loss) 323 327  
Prior service cost (credit) 11 5  
Total 334 332  
Net amount recognized 136 129  
Other Post-retirement Benefits | U.S. | Funded Plan      
Defined Benefit Plan Disclosure      
Projected benefit obligations 38 72 74
Items not yet recognized in pension expense and net postretirement benefit cost:      
Actuarial gain (loss) 20 1  
Prior service cost (credit) (35) 8  
Total (15) 9  
Net amount recognized (53) (63)  
Other Post-retirement Benefits | Non-U.S. | Funded Plan      
Defined Benefit Plan Disclosure      
Projected benefit obligations 80 71 $ 80
Items not yet recognized in pension expense and net postretirement benefit cost:      
Actuarial gain (loss) (7) (1)  
Total (7) (1)  
Net amount recognized $ (87) $ (72)