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Securities - Summary of Portfolio of Securities Available for Sale (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2022 | Dec. 31, 2021
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Fair Value | $ 5,612 |  | $ 5,780 |
Equity Securities, Fair Value | 15 |  | 16 |
Total Securities, Amortized Cost | 5,978 | [1] | 5,850 | [2]
Total Securities, Gross Unrealized Gain | 21 | [1] | 62 | [2]
Total Securities, Gross Unrealized Loss | 372 | [1] | 116 | [2]
Total Securities, Fair Value | 5,627 | [1] | 5,796 | [2]
Mortgage-Related Securities |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Amortized Cost | 2,806 |  | 2,819 |
Gross Unrealized Gain | 4 |  | 31 |
Gross Unrealized Loss | 194 |  | 60 |
Fair Value | 2,616 |  | 2,790 |
Mortgage-Related Securities | GSE Certificates |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Amortized Cost | 1,126 |  | 1,102 |
Gross Unrealized Gain | 3 |  | 20 |
Gross Unrealized Loss | 66 |  | 15 |
Fair Value | 1,063 |  | 1,107 |
Mortgage-Related Securities | GSE CMOs |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Amortized Cost | 1,680 |  | 1,717 |
Gross Unrealized Gain | 1 |  | 11 |
Gross Unrealized Loss | 128 |  | 45 |
Fair Value | 1,553 |  | 1,683 |
Debt Securities |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Amortized Cost | 3,156 |  | 3,015 |
Gross Unrealized Gain | 17 |  | 31 |
Gross Unrealized Loss | 177 |  | 56 |
Fair Value | 2,996 |  | 2,990 |
Debt Securities | U.S. Treasury Obligations |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Amortized Cost | 144 |  | 45 |
Fair Value | 144 |  | 45 |
Debt Securities | GSE Debentures |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Amortized Cost | 1,524 |  | 1,524 |
Gross Unrealized Gain | 1 |  | 1 |
Gross Unrealized Loss | 152 |  | 45 |
Fair Value | 1,373 |  | 1,480 |
Debt Securities | Asset-backed Securities |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Amortized Cost | 461 | [3] | 479 | [4]
Gross Unrealized Gain | 1 | [3] | 3 | [4]
Gross Unrealized Loss | 6 | [3] | 3 | [4]
Fair Value | 456 | [3] | 479 | [4]
Debt Securities | Municipal Bonds |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Amortized Cost | 25 |  | 25 |
Gross Unrealized Loss | 1 |  |  |
Fair Value | 24 |  | 25 |
Debt Securities | Corporate Bonds |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Amortized Cost | 881 |  | 821 |
Gross Unrealized Gain | 8 |  | 18 |
Gross Unrealized Loss | 11 |  | 1 |
Fair Value | 878 |  | 838 |
Debt Securities | Foreign Notes |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Amortized Cost | 25 |  | 25 |
Gross Unrealized Gain | 1 |  | 1 |
Fair Value | 26 |  | 26 |
Debt Securities | Capital Trust Notes |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Amortized Cost | 96 |  | 96 |
Gross Unrealized Gain | 6 |  | 8 |
Gross Unrealized Loss | 7 |  | 7 |
Fair Value | 95 |  | 97 |
Mortgage Backed Securities And Other Securities |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Amortized Cost | 5,962 |  | 5,834 |
Gross Unrealized Gain | 21 |  | 62 |
Gross Unrealized Loss | 371 |  | 116 |
Fair Value | 5,612 |  | 5,780 |
Equity Securities |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Equity Securities, Amortized Cost | 16 |  | 16 |
Equity Securities, Gross Unrealized Loss | 1 |  |  |
Equity Securities, Fair Value | 15 |  | 16 |
Equity Securities | Mutual Funds |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Equity Securities, Amortized Cost | 16 |  | 16 |
Equity Securities, Gross Unrealized Loss | 1 |  |  |
Equity Securities, Fair Value | $ 15 |  | $ 16 |
[1] | Excludes accrued interest receivable of $15 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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