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Borrowings - Maturity Dates of FHLB Advances and Other Borrowings (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Federal Home Loan Bank, Advances by Interest Rate Type, by Maturity    
2020 $ 4,165 $ 3,244
2021 0  
2022 0  
2023 250  
Thereafter 400  
Total $ 4,815 $ 3,394