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Debt (Maturities) (Details) - USD ($)
$ in Millions
Mar. 31, 2020
Dec. 31, 2019
Scheduled maturities of debt    
2021 $ 595  
2022 606  
2023 1,466  
2024 1,020  
2025 516  
Thereafter 5,043  
Total principal amount of debt 9,246 $ 9,361
Total debt-related balances, net (89)  
Total carrying amount of debt $ 9,157