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Securities - Summary of Held-to-Maturity and Available-for-Sale Securities Having Continuous Unrealized Loss Position (Details) - USD ($) $ in Millions | Jun. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Schedule of Investments [Line Items] |  |
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value | $ 3,096 | $ 1,846
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss | 205 | 44
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Fair Value | 2,136 | 1,683
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss | 403 | 72
Temporarily Impaired Available-for-Sale Securities, Total Fair Value | 5,232 | 3,529
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss | 608 | 116
Debt Securities | U.S. Treasury Obligations |  |
Schedule of Investments [Line Items] |  |
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value | 197 | 45
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss | 1 |
Temporarily Impaired Available-for-Sale Securities, Total Fair Value | 197 | 45
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss | 1 |
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 | 421 | 317
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss | 44 | 7
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Fair Value | 959 | 185
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss | 204 | 8
Temporarily Impaired Available-for-Sale Securities, Total Fair Value | 1,380 | 502
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss | 248 | 15
Debt Securities | GSE Certificates |  |
Schedule of Investments [Line Items] |  |
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value | 683 | 846
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss | 58 | 28
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Fair Value | 252 | 293
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss | 54 | 17
Temporarily Impaired Available-for-Sale Securities, Total Fair Value | 935 | 1,139
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss | 112 | 45
Debt Securities | GSE CMOs |  |
Schedule of Investments [Line Items] |  |
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value | 800 | 491
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss | 73 | 8
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Fair Value | 596 | 926
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss | 122 | 37
Temporarily Impaired Available-for-Sale Securities, Total Fair Value | 1,396 | 1,417
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss | 195 | 45
Debt Securities | Asset-backed Securities |  |
Schedule of Investments [Line Items] |  |
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value | 227 | 130
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss | 7 | 1
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Fair Value | 180 | 135
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss | 8 | 2
Temporarily Impaired Available-for-Sale Securities, Total Fair Value | 407 | 265
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss | 15 | 3
Debt Securities | Municipal Bonds |  |
Schedule of Investments [Line Items] |  |
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 | 7 | 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 | 713 |
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss | 21 |
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 | 5 | 1
Temporarily Impaired Available-for-Sale Securities, Total Fair Value | 808 | 99
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss | 26 | 1
Debt Securities | Foreign Notes |  |
Schedule of Investments [Line Items] |  |
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value | 5 | 5
Temporarily Impaired Available-for-Sale Securities, Total Fair Value | 5 | 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 | 1 |
Temporarily Impaired Available-for-Sale Securities, Total Fair Value | 15 | $ 12
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss | $ 1 |

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