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Fair Value Measurements - Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investment securities available-for-sale | $ 9,060 |  | $ 5,780 |
Total equity securities | 14 |  | 16 |
Total securities | 9,074 | [1] | 5,796 | [2]
Total assets at fair value | 69 |  | 64 |
Total liabilities at fair value | 1,115 |  |  |
Mortgage-Related Securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investment securities available-for-sale | 4,789 |  | 2,790 |
GSE Certificates | Mortgage-Related Securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investment securities available-for-sale | 1,297 |  | 1,107 |
GSE CMOs | Mortgage-Related Securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investment securities available-for-sale | 3,301 |  | 1,683 |
Fair Value, Measurements, Recurring |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investment securities available-for-sale | 9,060 |  | 5,780 |
Total equity securities | 14 |  | 16 |
Total securities | 9,074 |  | 5,796 |
Mortgage servicing rights | 1,033 |  |  |
Total assets at fair value | 11,451 |  |  |
Total liabilities at fair value | 136 |  |  |
Fair Value, Measurements, Recurring | Mortgage-Related Securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investment securities available-for-sale | 4,789 |  | 2,790 |
Fair Value, Measurements, Recurring | Residential First Mortgage |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Loans held-for-sale | 1,115 |  |  |
Fair Value, Measurements, Recurring | Other Securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investment securities available-for-sale | 4,271 |  | 2,990 |
Fair Value, Measurements, Recurring | GSE Certificates | Mortgage-Related Securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investment securities available-for-sale | 1,297 |  | 1,107 |
Fair Value, Measurements, Recurring | GSE CMOs | Mortgage-Related Securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investment securities available-for-sale | 3,301 |  | 1,683 |
Fair Value, Measurements, Recurring | Private Label CMOs | Mortgage-Related Securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investment securities available-for-sale | 191 |  |  |
Fair Value, Measurements, Recurring | U.S. Treasury Obligations | Other Securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investment securities available-for-sale | 1,487 |  | 45 |
Fair Value, Measurements, Recurring | GSE Debentures | Other Securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investment securities available-for-sale | 1,398 |  | 1,480 |
Fair Value, Measurements, Recurring | Asset-backed Securities | Other Securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investment securities available-for-sale | 361 |  | 479 |
Fair Value, Measurements, Recurring | Municipal Bonds | Other Securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investment securities available-for-sale | 30 |  | 25 |
Fair Value, Measurements, Recurring | Corporate Bonds | Other Securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investment securities available-for-sale | 885 |  | 838 |
Fair Value, Measurements, Recurring | Foreign Notes | Other Securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investment securities available-for-sale | 20 |  | 26 |
Fair Value, Measurements, Recurring | Capital Trust Notes | Other Securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investment securities available-for-sale | 90 |  | 97 |
Fair Value, Measurements, Recurring | Mutual Funds and Common Stock |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total equity securities | 14 |  | 16 |
Fair Value, Measurements, Recurring | Mortgage-backed securities forwards |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Derivative assets | $ 36 |  |  |
Derivative Asset, Statement of Financial Position [Extensible Enumeration] | Other Assets |  |  |
Derivative liabilities | $ 61 |  |  |
Derivative Liability, Statement of Financial Position [Extensible Enumeration] | Other Liabilities |  |  |
Fair Value, Measurements, Recurring | Interest rate swaps and swaptions |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Derivative assets | $ 182 |  |  |
Derivative Asset, Statement of Financial Position [Extensible Enumeration] | Other Assets |  |  |
Derivative liabilities | $ 65 |  |  |
Derivative Liability, Statement of Financial Position [Extensible Enumeration] | Other Liabilities |  |  |
Fair Value, Measurements, Recurring | Futures |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Derivative assets | $ 2 |  |  |
Derivative Asset, Statement of Financial Position [Extensible Enumeration] | Other Assets |  |  |
Fair Value, Measurements, Recurring | Rate lock commitments (fallout-adjusted) |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Derivative assets | $ 9 |  |  |
Derivative Asset, Statement of Financial Position [Extensible Enumeration] | Other Assets |  |  |
Derivative liabilities | $ 10 |  |  |
Derivative Liability, Statement of Financial Position [Extensible Enumeration] | Other Liabilities |  |  |
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investment securities available-for-sale | $ 1,487 |  | 45 |
Total securities | 1,487 |  | 45 |
Total assets at fair value | 1,487 |  |  |
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Other Securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investment securities available-for-sale | 1,487 |  | 45 |
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | U.S. Treasury Obligations | Other Securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investment securities available-for-sale | 1,487 |  | 45 |
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investment securities available-for-sale | 7,573 |  | 5,735 |
Total equity securities | 14 |  | 16 |
Total securities | 7,587 |  | 5,751 |
Total assets at fair value | 8,922 |  |  |
Total liabilities at fair value | 126 |  |  |
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Mortgage-Related Securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investment securities available-for-sale | 4,789 |  | 2,790 |
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Residential First Mortgage |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Loans held-for-sale | 1,115 |  |  |
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Other Securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investment securities available-for-sale | 2,784 |  | 2,945 |
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | GSE Certificates | Mortgage-Related Securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investment securities available-for-sale | 1,297 |  | 1,107 |
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | GSE CMOs | Mortgage-Related Securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investment securities available-for-sale | 3,301 |  | 1,683 |
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Private Label CMOs | Mortgage-Related Securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investment securities available-for-sale | 191 |  |  |
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | GSE Debentures | Other Securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investment securities available-for-sale | 1,398 |  | 1,480 |
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Asset-backed Securities | Other Securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investment securities available-for-sale | 361 |  | 479 |
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Municipal Bonds | Other Securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investment securities available-for-sale | 30 |  | 25 |
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Corporate Bonds | Other Securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investment securities available-for-sale | 885 |  | 838 |
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Foreign Notes | Other Securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investment securities available-for-sale | 20 |  | 26 |
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Capital Trust Notes | Other Securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investment securities available-for-sale | 90 |  | 97 |
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Mutual Funds and Common Stock |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total equity securities | 14 |  | $ 16 |
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Mortgage-backed securities forwards |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Derivative assets | $ 36 |  |  |
Derivative Asset, Statement of Financial Position [Extensible Enumeration] | Other Assets |  |  |
Derivative liabilities | $ 61 |  |  |
Derivative Liability, Statement of Financial Position [Extensible Enumeration] | Other Liabilities |  |  |
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Interest rate swaps and swaptions |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Derivative assets | $ 182 |  |  |
Derivative Asset, Statement of Financial Position [Extensible Enumeration] | Other Assets |  |  |
Derivative liabilities | $ 65 |  |  |
Derivative Liability, Statement of Financial Position [Extensible Enumeration] | Other Liabilities |  |  |
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Futures |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Derivative assets | $ 2 |  |  |
Derivative Asset, Statement of Financial Position [Extensible Enumeration] | Other Assets |  |  |
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Mortgage servicing rights | $ 1,033 |  |  |
Total assets at fair value | 1,042 |  |  |
Total liabilities at fair value | 10 |  |  |
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Rate lock commitments (fallout-adjusted) |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Derivative assets | $ 9 |  |  |
Derivative Asset, Statement of Financial Position [Extensible Enumeration] | Other Assets |  |  |
Derivative liabilities | $ 10 |  |  |
Derivative Liability, Statement of Financial Position [Extensible Enumeration] | Other Liabilities |  |  |
[1] | Excludes accrued interest receivable of $31 million included in other assets in the Consolidated Statements of Condition.
[2] | Excludes accrued interest receivable of $15 million included in other assets in the Consolidated Statements of Condition.

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