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Fair Value Measurements - Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Millions | Sep. 30, 2021 | Dec. 31, 2020
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available for sale | $ 5,914 | [1] | $ 5,845 | [2]
Total equity securities | 16 |  | 32 |
Total securities | 5,914 |  | 5,845 |
Fair Value, Measurements, Recurring |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available for sale | 5,898 |  | 5,814 |
Total equity securities | 16 |  | 31 |
Total securities | 5,914 |  | 5,845 |
Fair Value, Measurements, Recurring | Preferred Stock |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total equity securities |  |  | 15 |
Fair Value, Measurements, Recurring | Mutual Fund |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total equity securities | 16 |  | 16 |
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] |  |  |  |
Securities available for sale | 65 |  | 65 |
Total equity securities |  |  | 15 |
Total securities | 65 |  | 80 |
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Preferred Stock |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total equity securities |  |  | 15 |
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available for sale | 5,833 |  | 5,749 |
Total equity securities | 16 |  | 16 |
Total securities | 5,849 |  | 5,765 |
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Mutual Fund |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total equity securities | 16 |  | 16 |
Fair Value, Measurements, Recurring | Mortgage-Related Securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available for sale | 2,979 |  | 3,038 |
Fair Value, Measurements, Recurring | Mortgage-Related Securities | GSE Certificates |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available for sale | 1,130 |  | 1,209 |
Fair Value, Measurements, Recurring | Mortgage-Related Securities | GSE CMOs |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available for sale | 1,849 |  | 1,829 |
Fair Value, Measurements, Recurring | Mortgage-Related Securities | Municipal Bonds |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available for sale | 25 |  |  |
Fair Value, Measurements, Recurring | Mortgage-Related Securities | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available for sale |  |  | 3,038 |
Fair Value, Measurements, Recurring | Mortgage-Related Securities | Quoted Prices in Active Markets for Identical Assets (Level 1) | GSE Certificates |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available for sale |  |  | 1,209 |
Fair Value, Measurements, Recurring | Mortgage-Related Securities | Quoted Prices in Active Markets for Identical Assets (Level 1) | GSE CMOs |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available for sale |  |  | 1,829 |
Fair Value, Measurements, Recurring | Mortgage-Related Securities | Significant Other Observable Inputs (Level 2) |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available for sale | 2,979 |  |  |
Fair Value, Measurements, Recurring | Mortgage-Related Securities | Significant Other Observable Inputs (Level 2) | GSE Certificates |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available for sale | 1,130 |  |  |
Fair Value, Measurements, Recurring | Mortgage-Related Securities | Significant Other Observable Inputs (Level 2) | GSE CMOs |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available for sale | 1,849 |  |  |
Fair Value, Measurements, Recurring | Mortgage-Related Securities | Significant Other Observable Inputs (Level 2) | Capital Trust Notes |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available for sale | 95 |  |  |
Fair Value, Measurements, Recurring | Other Securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available for sale | 2,919 |  | 2,776 |
Fair Value, Measurements, Recurring | Other Securities | U.S. Treasury Obligations |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available for sale | 65 |  | 65 |
Fair Value, Measurements, Recurring | Other Securities | GSE Debentures |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available for sale | 1,372 |  | 1,158 |
Fair Value, Measurements, Recurring | Other Securities | Asset-backed Securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available for sale | 495 |  | 526 |
Fair Value, Measurements, Recurring | Other Securities | Municipal Bonds |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available for sale |  |  | 27 |
Fair Value, Measurements, Recurring | Other Securities | Corporate Bonds |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available for sale | 841 |  | 883 |
Fair Value, Measurements, Recurring | Other Securities | Foreign Notes |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available for sale | 26 |  | 26 |
Fair Value, Measurements, Recurring | Other Securities | Capital Trust Notes |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available for sale | 95 |  | 91 |
Fair Value, Measurements, Recurring | Other Securities | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available for sale | 65 |  | 65 |
Fair Value, Measurements, Recurring | Other Securities | Quoted Prices in Active Markets for Identical Assets (Level 1) | U.S. Treasury Obligations |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available for sale | 65 |  | 65 |
Fair Value, Measurements, Recurring | Other Securities | Significant Other Observable Inputs (Level 2) |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available for sale | 2,854 |  | 2,711 |
Fair Value, Measurements, Recurring | Other Securities | Significant Other Observable Inputs (Level 2) | GSE Certificates |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available for sale |  |  | 1,158 |
Fair Value, Measurements, Recurring | Other Securities | Significant Other Observable Inputs (Level 2) | GSE Debentures |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available for sale | 1,372 |  |  |
Fair Value, Measurements, Recurring | Other Securities | Significant Other Observable Inputs (Level 2) | Asset-backed Securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available for sale | 495 |  | 526 |
Fair Value, Measurements, Recurring | Other Securities | Significant Other Observable Inputs (Level 2) | Municipal Bonds |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available for sale | 25 |  | 27 |
Fair Value, Measurements, Recurring | Other Securities | Significant Other Observable Inputs (Level 2) | Corporate Bonds |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available for sale | 841 |  | 883 |
Fair Value, Measurements, Recurring | Other Securities | Significant Other Observable Inputs (Level 2) | Foreign Notes |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available for sale | $ 26 |  | 26 |
Fair Value, Measurements, Recurring | Other Securities | Significant Other Observable Inputs (Level 2) | Capital Trust Notes |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available for sale |  |  | $ 91 |
[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.

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