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Long-Term Debt-Maturity Schedule (Details)
$ in Millions
Dec. 31, 2020
USD ($)
Long-term Debt, Fiscal Year Maturity [Abstract]  
2021 $ 6,480
2022 2,886
2023 1,521
2024 1,457
2025 3,854
Thereafter 3,781
Total $ 19,979