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Debt and Credit Facilities - Contractual Maturities of Financing Obligations (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Debt Instrument [Line Items]    
Total $ 26,695 $ 31,402
Senior notes    
Debt Instrument [Line Items]    
2022 1,500  
2023 2,250  
2024 1,750  
2025 1,750  
2026 2,750  
Thereafter 15,750  
Total $ 25,750