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Securities - Summary of Held-to-Maturity and Available-for-Sale Securities Having Continuous Unrealized Loss Position (Details) - USD ($) $ in Millions | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Schedule of Investments [Line Items] |  |
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value | $ 2,588 | $ 1,095
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss | 76 | 10
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Fair Value | 827 | 726
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss | 28 | 20
Temporarily Impaired Available-for-Sale Securities, Total Fair Value | 3,415 | 1,821
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss | 104 | 30
Debt Securities | U.S. Treasury Obligations |  |
Schedule of Investments [Line Items] |  |
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value | 45 |
Temporarily Impaired Available-for-Sale Securities, Total Fair Value | 45 |
Debt Securities | U.S. Government and GSE obligations |  |
Schedule of Investments [Line Items] |  |
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value |  | 59
Temporarily Impaired Available-for-Sale Securities, Total Fair Value |  | 59
Debt Securities | GSE Certificates |  |
Schedule of Investments [Line Items] |  |
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value | 497 | 442
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss | 15 | 3
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Fair Value |  | 74
Temporarily Impaired Available-for-Sale Securities, Total Fair Value | 497 | 516
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss | 15 | 3
Debt Securities | GSE CMOs |  |
Schedule of Investments [Line Items] |  |
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value | 969 | 522
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss | 35 | 4
Temporarily Impaired Available-for-Sale Securities, Total Fair Value | 969 | 522
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss | 35 | 4
Debt Securities | GSE Debentures |  |
Schedule of Investments [Line Items] |  |
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value | 927 |
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss | 26 |
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Fair Value | 393 |
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss | 17 |
Temporarily Impaired Available-for-Sale Securities, Total Fair Value | 1,320 |
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss | 43 |
Debt Securities | Asset-backed Securities |  |
Schedule of Investments [Line Items] |  |
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value | 138 |
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Fair Value | 141 | 364
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss | 2 | 6
Temporarily Impaired Available-for-Sale Securities, Total Fair Value | 279 | 364
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss | 2 | 6
Debt Securities | Municipal Bonds |  |
Schedule of Investments [Line Items] |  |
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Fair Value | 8 | 9
Temporarily Impaired Available-for-Sale Securities, Total Fair Value | 8 | 9
Debt Securities | Corporate Bonds |  |
Schedule of Investments [Line Items] |  |
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value |  | 72
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss |  | 3
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Fair Value | 249 | 246
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss | 1 | 3
Temporarily Impaired Available-for-Sale Securities, Total Fair Value | 249 | 318
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss | 1 | 6
Debt Securities | Capital Trust Notes |  |
Schedule of Investments [Line Items] |  |
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Fair Value | 36 | 33
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss | 8 | 11
Temporarily Impaired Available-for-Sale Securities, Total Fair Value | 36 | 33
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss | 8 | $ 11
Equity Securities |  |
Schedule of Investments [Line Items] |  |
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value | 12 |
Temporarily Impaired Available-for-Sale Securities, Total Fair Value | $ 12 |

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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale in a continuous loss position. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27337-111563 + Details
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