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Debt - Maturities of Long-Term Debt (Details)
$ in Millions
Mar. 31, 2020
USD ($)
Long-term Debt, Fiscal Year Maturity [Abstract]  
2021 $ 290
2022 2,199
2023 1,514
2024 182
2025 2,698
Thereafter 1,477
Total $ 8,360