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Derivative and Hedging Activities and Restricted Cash - Notional Amount and Fair Value of Derivative Financial Instruments (Details) - USD ($) $ in Millions | Mar. 31, 2025 | Dec. 31, 2024
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Derivatives designated as hedging instruments: | Interest rate swaps | Other Assets |  |
Derivative Asset [Abstract] |  |
Notional Amount | $ 993 |
Fair Value | 0 |
Derivatives designated as hedging instruments: | Interest rate swaps | Other Liabilities |  |
Derivative Asset [Abstract] |  |
Fair Value | 0 |
Derivatives not designated as hedging instruments: | Interest rate swaps | Other Assets |  |
Derivative Asset [Abstract] |  |
Notional Amount | 3,234 | $ 3,323
Fair Value | 15 | 15
Derivatives not designated as hedging instruments: | Interest rate swaps | Other Liabilities |  |
Derivative Asset [Abstract] |  |
Fair Value | 23 | 30
Derivatives not designated as hedging instruments: | Rate lock commitments | Other Assets |  |
Derivative Asset [Abstract] |  |
Notional Amount | 547 | 563
Fair Value | 4 | 3
Derivatives not designated as hedging instruments: | Rate lock commitments | Other Liabilities |  |
Derivative Asset [Abstract] |  |
Fair Value | 3 | 3
Derivatives not designated as hedging instruments: | Mortgage-backed securities forwards | Other Assets |  |
Derivative Asset [Abstract] |  |
Notional Amount | 281 | 344
Fair Value | 0 | 7
Derivatives not designated as hedging instruments: | Mortgage-backed securities forwards | Other Liabilities |  |
Derivative Asset [Abstract] |  |
Fair Value | $ 3 | $ 2

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