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Retirement Programs - Contributions and Estimated Future Benefit Payments (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]      
Pension contributions $ 91 $ 94 $ 87
OPEB      
Defined Benefit Plan Disclosure [Line Items]      
2021 13    
2022 12    
2023 12    
2024 11    
2025 10    
2026-2030 44    
Minimum      
Defined Benefit Plan Disclosure [Line Items]      
Estimated Pension plan contributions during next fiscal year 70    
Maximum      
Defined Benefit Plan Disclosure [Line Items]      
Estimated Pension plan contributions during next fiscal year 80    
U.S. | Pensions      
Defined Benefit Plan Disclosure [Line Items]      
2021 175    
2022 146    
2023 148    
2024 151    
2025 155    
2026-2030 771    
International | Pensions      
Defined Benefit Plan Disclosure [Line Items]      
2021 360    
2022 360    
2023 371    
2024 380    
2025 389    
2026-2030 $ 1,046