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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, 2022 | Dec. 31, 2021
--- | --- | ---
Schedule of Investments [Line Items] |  |
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value | $ 5,658 | $ 1,846
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss | 122 | 44
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Fair Value | 2,911 | 1,683
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss | 752 | 72
Temporarily Impaired Available-for-Sale Securities, Total Fair Value | 8,569 | 3,529
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss | 873 | 116
Debt Securities | U.S. Treasury Obligations |  |
Schedule of Investments [Line Items] |  |
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value | 1,487 | 45
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss | 4 |
Temporarily Impaired Available-for-Sale Securities, Total Fair Value | 1,487 | 45
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss | 4 |
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 | 243 | 317
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss | 5 | 7
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Fair Value | 1,156 | 185
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss | 346 | 8
Temporarily Impaired Available-for-Sale Securities, Total Fair Value | 1,399 | 502
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss | 351 | 15
Debt Securities | GSE Certificates |  |
Schedule of Investments [Line Items] |  |
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value | 871 | 846
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss | 46 | 28
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Fair Value | 420 | 293
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss | 114 | 17
Temporarily Impaired Available-for-Sale Securities, Total Fair Value | 1,291 | 1,139
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss | 160 | 45
Debt Securities | GSE CMOs |  |
Schedule of Investments [Line Items] |  |
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value | 2,219 | 491
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss | 36 | 8
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Fair Value | 925 | 926
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss | 264 | 37
Temporarily Impaired Available-for-Sale Securities, Total Fair Value | 3,144 | 1,417
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss | 300 | 45
Debt Securities | Asset-backed Securities |  |
Schedule of Investments [Line Items] |  |
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value | 61 | 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 | 262 | 135
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss | 12 | 2
Temporarily Impaired Available-for-Sale Securities, Total Fair Value | 323 | 265
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss | 14 | 3
Debt Securities | Municipal Bonds |  |
Schedule of Investments [Line Items] |  |
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value | 9 |
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Fair Value | 7 | 8
Temporarily Impaired Available-for-Sale Securities, Total Fair Value | 16 | 8
Debt Securities | Corporate Bonds |  |
Schedule of Investments [Line Items] |  |
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value | 698 |
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 | 97 | 99
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss | 4 | 1
Temporarily Impaired Available-for-Sale Securities, Total Fair Value | 795 | 99
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss | 30 | 1
Debt Securities | Foreign Notes |  |
Schedule of Investments [Line Items] |  |
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value | 20 | 5
Temporarily Impaired Available-for-Sale Securities, Total Fair Value | 20 | 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 | 2 |
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Fair Value | 34 | 37
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss | 10 | 7
Temporarily Impaired Available-for-Sale Securities, Total Fair Value | 80 | 37
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss | 12 | 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 | 10 |
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss | 2 |
Temporarily Impaired Available-for-Sale Securities, Total Fair Value | 14 | $ 12
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss | $ 2 |

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