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Debt 2 (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Long-term Debt, Fiscal Year Maturity [Abstract]    
2021 $ 2,975  
2022 2,050  
2023 0  
2024 0  
2025 0  
Thereafter 2,000  
Total 7,025  
Unamortized Underwriting Fees (9) $ (20)
Unamortized Discount (19)  
Impacts due to Fair Value Hedge Accounting 40  
Total Long-Term Debt $ 7,037 $ 13,469