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Debt (Maturities) (Details) - USD ($)
$ in Millions
Sep. 30, 2018
Dec. 31, 2017
Scheduled maturities of debt    
2019 $ 385  
2020 392  
2021 685  
2022 681  
2023 2,838  
Thereafter 4,453  
Total principal amount of debt 9,434 $ 7,484
Total debt-related balances, net (107)  
Total carrying amount of debt $ 9,327