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Debt Debt Maturities (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Debt Disclosure [Abstract]    
2020 $ 35  
2021 640  
2022 3,055  
2023 645  
2024 1,000  
Thereafter 2,751  
Future maturiites due on debt 8,126  
Less: unamortized discounts, premiums and deferred financing fees (27)  
Finance Lease, Liability 93  
Debt $ 8,192 $ 7,326