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Securities - Summary of Held-to-Maturity and Available-for-Sale Securities Having Continuous Unrealized Loss Position (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Schedule of Investments [Line Items] |  |
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value | $ 1,846 | $ 1,095
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss | 44 | 10
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Fair Value | 1,683 | 726
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss | 72 | 20
Temporarily Impaired Available-for-Sale Securities, Total Fair Value | 3,529 | 1,821
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss | 116 | 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 | 317 | 59
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss | 7 |
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Fair Value | 185 |
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss | 8 |
Temporarily Impaired Available-for-Sale Securities, Total Fair Value | 502 | 59
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss | 15 |
Debt Securities | GSE Certificates |  |
Schedule of Investments [Line Items] |  |
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value | 846 | 442
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss | 28 | 3
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Fair Value | 293 | 74
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss | 17 |
Temporarily Impaired Available-for-Sale Securities, Total Fair Value | 1,139 | 516
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss | 45 | 3
Debt Securities | GSE CMOs |  |
Schedule of Investments [Line Items] |  |
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value | 491 | 522
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss | 8 | 4
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Fair Value | 926 |
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss | 37 |
Temporarily Impaired Available-for-Sale Securities, Total Fair Value | 1,417 | 522
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss | 45 | 4
Debt Securities | Asset-backed Securities |  |
Schedule of Investments [Line Items] |  |
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value | 130 |
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss | 1 |
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Fair Value | 135 | 364
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss | 2 | 6
Temporarily Impaired Available-for-Sale Securities, Total Fair Value | 265 | 364
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss | 3 | 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 | 99 | 246
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss | 1 | 3
Temporarily Impaired Available-for-Sale Securities, Total Fair Value | 99 | 318
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss | 1 | 6
Debt Securities | Foreign Notes |  |
Schedule of Investments [Line Items] |  |
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value | 5 |
Temporarily Impaired Available-for-Sale Securities, Total Fair Value | 5 |
Debt Securities | Capital Trust Notes |  |
Schedule of Investments [Line Items] |  |
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Fair Value | 37 | 33
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss | 7 | 11
Temporarily Impaired Available-for-Sale Securities, Total Fair Value | 37 | 33
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss | 7 | $ 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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