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Securities - Summary of Portfolio of Securities Available for Sale (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2022 | Dec. 31, 2021
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Fair value |  | $ 9,060 |  | $ 5,780 |
Equity Securities, Fair Value |  | 14 |  | 16 |
Total Securities, Amortized Cost |  | 9,933 | [1] | 5,850 | [2]
Total Securities, Gross Unrealized Gain |  | 14 | [1] | 62 | [2]
Total Securities, Gross Unrealized Loss |  | 873 | [1] | 116 | [2]
Total Securities, Fair Value |  | 9,074 | [1] | 5,796 | [2]
Mortgage-Related Securities |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Amortized Cost |  | 5,242 |  | 2,819 |
Gross Unrealized Gain |  | 7 |  | 31 |
Gross Unrealized Loss |  | 460 |  | 60 |
Fair value |  | 4,789 |  | 2,790 |
Mortgage-Related Securities | GSE Certificates |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Amortized Cost |  | 1,457 |  | 1,102 |
Gross Unrealized Gain |  |  |  | 20 |
Gross Unrealized Loss |  | 160 |  | 15 |
Fair value |  | 1,297 |  | 1,107 |
Mortgage-Related Securities | GSE CMOs |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Amortized Cost |  | 3,600 |  | 1,717 |
Gross Unrealized Gain |  | 1 |  | 11 |
Gross Unrealized Loss |  | 300 |  | 45 |
Fair value |  | 3,301 |  | 1,683 |
Mortgage-Related Securities | Private Label CMOs |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Amortized Cost |  | 185 |  |  |
Gross Unrealized Gain |  | 6 |  |  |
Fair value |  | 191 |  |  |
Debt Securities |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Amortized Cost |  | 4,675 |  | 3,015 |
Gross Unrealized Gain |  | 7 |  | 31 |
Gross Unrealized Loss |  | 411 |  | 56 |
Fair value |  | 4,271 |  | 2,990 |
Debt Securities | U.S. Treasury Obligations |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Amortized Cost |  | 1,491 |  | 45 |
Gross Unrealized Loss |  | 4 |  |  |
Fair value |  | 1,487 |  | 45 |
Debt Securities | GSE Debentures |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Amortized Cost |  | 1,749 |  | 1,524 |
Gross Unrealized Gain |  |  |  | 1 |
Gross Unrealized Loss |  | 351 |  | 45 |
Fair value |  | 1,398 |  | 1,480 |
Debt Securities | Asset-backed Securities |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Amortized Cost |  | 375 | [3] | 479 | [4]
Gross Unrealized Gain | [4] |  |  | 3 |
Gross Unrealized Loss |  | 14 | [3] | 3 | [4]
Fair value |  | 361 | [3] | 479 | [4]
Debt Securities | Municipal Bonds |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Amortized Cost |  | 30 |  | 25 |
Fair value |  | 30 |  | 25 |
Debt Securities | Corporate Bonds |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Amortized Cost |  | 913 |  | 821 |
Gross Unrealized Gain |  | 2 |  | 18 |
Gross Unrealized Loss |  | 30 |  | 1 |
Fair value |  | 885 |  | 838 |
Debt Securities | Foreign Notes |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Amortized Cost |  | 20 |  | 25 |
Gross Unrealized Gain |  |  |  | 1 |
Fair value |  | 20 |  | 26 |
Debt Securities | Capital Trust Notes |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Amortized Cost |  | 97 |  | 96 |
Gross Unrealized Gain |  | 5 |  | 8 |
Gross Unrealized Loss |  | 12 |  | 7 |
Fair value |  | 90 |  | 97 |
Mortgage Backed Securities And Other Securities |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Amortized Cost |  | 9,917 |  | 5,834 |
Gross Unrealized Gain |  | 14 |  | 62 |
Gross Unrealized Loss |  | 871 |  | 116 |
Fair value |  | 9,060 |  | 5,780 |
Equity Securities |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Equity Securities, Amortized Cost |  | 16 |  | 16 |
Equity Securities, Gross Unrealized Loss |  | 2 |  |  |
Equity Securities, Fair Value |  | 14 |  | 16 |
Equity Securities | Mutual Funds |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Equity Securities, Amortized Cost |  | 16 |  | 16 |
Equity Securities, Gross Unrealized Loss |  | 2 |  |  |
Equity Securities, Fair Value |  | $ 14 |  | $ 16 |
[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.
[3] | The underlying assets of the asset-backed securities are substantially guaranteed by the U.S. Government.
[4] | The underlying assets of the asset-backed securities are substantially guaranteed by the U.S. Government.

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