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Borrowed Funds - Summary of Borrowed Funds (Details) - USD ($)
$ in Millions
Sep. 30, 2021
Dec. 31, 2020
Debt Disclosure [Abstract]    
FHLB advances $ 13,978 $ 14,628
Repurchase agreements 800 800
Total wholesale borrowings 14,778 15,428
Junior subordinated debentures 360 360
Subordinated notes 296 296
Total borrowed funds $ 15,434 $ 16,084