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Borrowings (Annual Maturities on Long-term Debt Outstanding) (Details) - USD ($)
$ in Millions
Sep. 30, 2021
Dec. 31, 2020
Debt Disclosure [Abstract]    
2021 $ 608  
2022 1,035  
2023 829  
2024 3,673  
2025 2,237  
Thereafter 11,050  
Total maturities 19,432  
Unamortized discount— net 195  
Debt issuance costs (97) $ (54)
Total long-term debt $ 19,530 $ 13,632