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Securities - Summary of Portfolio of Securities Available for Sale (Details) - USD ($) $ in Millions | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Amortized Cost | $ 5,936 | [1] | $ 5,744 | [2]
Gross Unrealized Gain | 82 | [1] | 131 | [2]
Gross Unrealized Loss | 104 | [1] | 30 | [2]
Fair Value | 5,914 | [1] | 5,845 | [2]
Mortgage-Related Securities |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Amortized Cost | 2,982 |  | 2,942 |
Gross Unrealized Gain | 47 |  | 99 |
Gross Unrealized Loss | 50 |  | 3 |
Fair Value | 2,979 |  | 3,038 |
Mortgage-Related Securities | GSE Certificates |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Amortized Cost | 1,117 |  | 1,155 |
Gross Unrealized Gain | 28 |  | 54 |
Gross Unrealized Loss | 15 |  |  |
Fair Value | 1,130 |  | 1,209 |
Mortgage-Related Securities | GSE CMOs |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Amortized Cost | 1,865 |  | 1,787 |
Gross Unrealized Gain | 19 |  | 45 |
Gross Unrealized Loss | 35 |  | 3 |
Fair Value | 1,849 |  | 1,829 |
Debt Securities |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Amortized Cost | 2,938 |  | 2,771 |
Gross Unrealized Gain | 35 |  | 32 |
Gross Unrealized Loss | 54 |  | 27 |
Fair Value | 2,919 |  | 2,776 |
Debt Securities | U.S. Treasury Obligations |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Amortized Cost | 65 |  | 65 |
Fair Value | 65 |  | 65 |
Debt Securities | GSE Debentures |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Amortized Cost | 1,413 |  | 1,158 |
Gross Unrealized Gain | 2 |  | 4 |
Gross Unrealized Loss | 43 |  | 4 |
Fair Value | 1,372 |  | 1,158 |
Debt Securities | Asset-backed Securities |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Amortized Cost | 493 | [3] | 530 | [4]
Gross Unrealized Gain | 4 | [3] | 2 | [4]
Gross Unrealized Loss | 2 | [3] | 6 | [4]
Fair Value | 495 | [3] | 526 | [4]
Debt Securities | Municipal Bonds |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Amortized Cost | 25 |  | 26 |
Gross Unrealized Gain |  |  | 1 |
Fair Value | 25 |  | 27 |
Debt Securities | Corporate Bonds |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Amortized Cost | 821 |  | 871 |
Gross Unrealized Gain | 21 |  | 18 |
Gross Unrealized Loss | 1 |  | 6 |
Fair Value | 841 |  | 883 |
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 | 7 |  | 6 |
Gross Unrealized Loss | 8 |  | 11 |
Fair Value | 95 |  | 91 |
Mortgage Backed Securities And Other Securities |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Amortized Cost | 5,920 |  | 5,713 |
Gross Unrealized Gain | 82 |  | 131 |
Gross Unrealized Loss | 104 |  | 30 |
Fair Value | 5,898 |  | 5,814 |
Equity Securities |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Amortized Cost | 16 |  | 31 |
Fair Value | 16 |  | 31 |
Equity Securities | Preferred Stock |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Amortized Cost |  |  | 15 |
Fair Value |  |  | 15 |
Equity Securities | Mutual Funds |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Amortized Cost | 16 |  | 16 |
Fair Value | $ 16 |  | $ 16 |
[1] | Excludes accrued interest receivable of $14 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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