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Borrowed Funds - Breakdown of borrowed funds (Details) - USD ($) $ in Millions | Sep. 30, 2023 | Dec. 31, 2022
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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

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