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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, 2022 | Dec. 31, 2021
--- | --- | ---
Schedule of Investments [Line Items] |  |
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value | $ 3,821 | $ 1,846
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss | 181 | 44
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Fair Value | 2,594 | 1,683
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss | 667 | 72
Temporarily Impaired Available-for-Sale Securities, Total Fair Value | 6,415 | 3,529
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss | 848 | 116
Debt Securities | U.S. Treasury Obligations |  |
Schedule of Investments [Line Items] |  |
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value | 1,476 | 45
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss | 5 |
Temporarily Impaired Available-for-Sale Securities, Total Fair Value | 1,476 | 45
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss | 5 |
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 | 394 | 317
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss | 43 | 7
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Fair Value | 1,012 | 185
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss | 300 | 8
Temporarily Impaired Available-for-Sale Securities, Total Fair Value | 1,406 | 502
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss | 343 | 15
Debt Securities | GSE Certificates |  |
Schedule of Investments [Line Items] |  |
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value | 572 | 846
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss | 62 | 28
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Fair Value | 371 | 293
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss | 109 | 17
Temporarily Impaired Available-for-Sale Securities, Total Fair Value | 943 | 1,139
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss | 171 | 45
Debt Securities | GSE CMOs |  |
Schedule of Investments [Line Items] |  |
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value | 448 | 491
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss | 41 | 8
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Fair Value | 838 | 926
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss | 235 | 37
Temporarily Impaired Available-for-Sale Securities, Total Fair Value | 1,286 | 1,417
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss | 276 | 45
Debt Securities | Asset-backed Securities |  |
Schedule of Investments [Line Items] |  |
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value | 125 | 130
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss | 2 | 1
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Fair Value | 224 | 135
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss | 8 | 2
Temporarily Impaired Available-for-Sale Securities, Total Fair Value | 349 | 265
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss | 10 | 3
Debt Securities | Municipal Bonds |  |
Schedule of Investments [Line Items] |  |
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value | 11 |
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Fair Value | 7 | 8
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss | 1 |
Temporarily Impaired Available-for-Sale Securities, Total Fair Value | 18 | 8
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss | 1 |
Debt Securities | Corporate Bonds |  |
Schedule of Investments [Line Items] |  |
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value | 720 |
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss | 27 |
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Fair Value | 95 | 99
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss | 4 | 1
Temporarily Impaired Available-for-Sale Securities, Total Fair Value | 815 | 99
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss | 31 | 1
Debt Securities | Foreign Notes |  |
Schedule of Investments [Line Items] |  |
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value | 25 | 5
Temporarily Impaired Available-for-Sale Securities, Total Fair Value | 25 | 5
Debt Securities | Capital Trust Notes |  |
Schedule of Investments [Line Items] |  |
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value | 46 |
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 | 36 | 37
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss | 8 | 7
Temporarily Impaired Available-for-Sale Securities, Total Fair Value | 82 | 37
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss | 9 | 7
Equity Securities |  |
Schedule of Investments [Line Items] |  |
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value | 4 | 12
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Fair Value | 11 |
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss | 2 |
Temporarily Impaired Available-for-Sale Securities, Total Fair Value | 15 | $ 12
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss | $ 2 |

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