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Debt, Debt Maturities (Details)
$ in Millions
Dec. 31, 2020
USD ($)
Debt Maturities [Abstract]  
Long term debt maturing in 2021 $ 37
Long term debt maturing in 2022 650
Long term debt maturing in 2023 1,100
Long term debt maturing in 2024 2,000
Long term debt maturing in 2025 7
Long term debt maturing thereafter $ 6,400