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Debt - Maturities (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Debt Disclosure [Abstract]    
2021 $ 400  
2022 1,213  
2023 777  
2024 1,600  
2025 1,350  
Thereafter 2,651  
Total debt payments (excluding financing lease payments) 7,991  
Less: unamortized discounts, premiums and deferred financing fees (13)  
Finance Lease, Liability 81  
Debt and Lease Obligation, Total $ 8,059 $ 8,192