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Borrowings - Maturity Dates of FHLB Advances and Other Borrowings (Details) - USD ($)
$ in Millions
Mar. 31, 2020
Dec. 31, 2019
Debt Disclosure [Abstract]    
2020 $ 5,841  
2021 0  
2022 0  
2023 500  
Thereafter 500  
Total $ 6,841 $ 4,815