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Benefit Plans - Pension Plans Resulted in Net Pension Liability (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items]    
Prepaid pension assets $ 672 $ 516
Other current liabilities (29) (35)
Accrued pension costs (1,257) (1,190)
Net pension liability (614) (709)
Pension Plans    
Defined Benefit Plan Disclosure [Line Items]    
Net pension liability (614) (709)
Pension Plans | U.S. Plans    
Defined Benefit Plan Disclosure [Line Items]    
Projected benefit obligation 51 55
Accumulated benefit obligation 51 55
Fair value of plan assets 3 2
Pension Plans | Non-U.S. Plans    
Defined Benefit Plan Disclosure [Line Items]    
Projected benefit obligation 4,059 3,613
Accumulated benefit obligation 3,873 3,447
Fair value of plan assets $ 2,827 $ 2,443