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Borrowings (Annual Maturities on Long-term Debt Outstanding) (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Debt Disclosure [Abstract]    
2021 $ 1,802  
2022 1,008  
2023 802  
2024 900  
2025 2,225  
Thereafter 6,700  
Total maturities 13,437  
Unamortized discount — net 249  
Debt issuance costs (54) $ (37)
Total long-term debt [1] $ 13,632 $ 7,430
[1] Certain prior year amounts have been reclassified to conform to the current year presentation. See Note 1 for additional information.