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Debt (Maturities) (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Scheduled maturities of debt    
2020 $ 581  
2021 633  
2022 610  
2023 2,316  
2024 854  
Thereafter 4,367  
Total principal amount of debt 9,361 $ 10,094
Total debt-related balances, net (100)  
Total carrying amount of debt $ 9,261