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Debt - Maturities (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Debt Disclosure [Abstract]    
2021 $ 73  
2022 74  
2023 1,611  
2024 1,363  
2025 1,349  
Thereafter 3,156  
Total debt payments (excluding financing lease payments) 7,626  
Less: unamortized discounts, premiums and deferred financing fees (6)  
Finance Lease, Liability 72 $ 81
Debt and Lease Obligation, Total $ 7,692 $ 8,059