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Borrowings - Maturity Dates of FHLB Advances and Other Borrowings (Details) - USD ($)
$ in Millions
Sep. 30, 2021
Dec. 31, 2020
Debt Disclosure [Abstract]    
2021 $ 1,870  
2022 200  
2023 500  
2024 100  
Thereafter 600  
Total $ 3,270 $ 5,100