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Borrowings - Breakdown of FHLB Advances Outstanding (Details) - USD ($)
$ in Millions
Jun. 30, 2021
Dec. 31, 2020
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]    
Total short-term Federal Home Loan Bank advances and other borrowings $ 2,095 $ 3,900
Long-term Federal Home Loan Bank fixed rate advances 1,200 1,200
Total $ 3,295 $ 5,100
Rate 1.03% 1.03%
Current portion of fixed rate advances $ 200 $ 0
Short-term fixed rate term advances    
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]    
Total short-term Federal Home Loan Bank advances and other borrowings $ 1,130 $ 3,415
Rate 0.20% 0.20%
Short-term variable rate term advances    
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]    
Total short-term Federal Home Loan Bank advances and other borrowings $ 300 $ 0
Rate 0.10% 0.00%
Other short-term borrowings    
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]    
Total short-term Federal Home Loan Bank advances and other borrowings $ 665 $ 485
Rate 0.13% 0.08%