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Debt Debt Maturities (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Debt Disclosure [Abstract]    
2019 $ 27  
2020 1,718  
2021 620  
2022 3,059  
2023 648  
Thereafter 1,280  
Future maturiites due on debt 7,352  
Unamortized discounts, premiums and deferred financing fees (26)  
Total Debt $ 7,326 $ 7,372