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Debt - Maturities of Long-term Debt (Details)
$ in Millions
Dec. 31, 2019
USD ($)
Debt Disclosure [Abstract]  
Principal amount of long-term debt maturing in year 2020 $ 1,000
Principal amount of long-term debt maturing in year 2021 1,250
Principal amount of long-term debt maturing in year 2022 627
Principal amount of long-term debt maturing in year 2023 0
Principal amount of long-term debt maturing in year 2024 $ 1,250