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Borrowed Funds - Breakdown of borrowed funds (Details) - USD ($)
$ in Millions
Sep. 30, 2023
Dec. 31, 2022
Debt Disclosure [Abstract]    
FHLB advances $ 13,023 $ 20,325
Fed funds purchased 547 0
Total wholesale borrowings 13,570 20,325
Junior subordinated debentures 578 575
Subordinated notes 437 432
Total borrowed funds $ 14,585 $ 21,332