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Securities - Summary of Held-to-Maturity and Available-for-Sale Securities Having Continuous Unrealized Loss Position (Details) - USD ($) $ in Millions | Mar. 31, 2022 | Dec. 31, 2021
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Schedule of Investments [Line Items] |  |
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value | $ 2,404 | $ 1,846
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss | 112 | 44
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Fair Value | 2,225 | 1,683
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss | 260 | 72
Temporarily Impaired Available-for-Sale Securities, Total Fair Value | 4,629 | 3,529
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss | 372 | 116
Debt Securities | U.S. Treasury Obligations |  |
Schedule of Investments [Line Items] |  |
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value | 144 | 45
Temporarily Impaired Available-for-Sale Securities, Total Fair Value | 144 | 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 | 313 | 317
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss | 27 | 7
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Fair Value | 1,037 | 185
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss | 125 | 8
Temporarily Impaired Available-for-Sale Securities, Total Fair Value | 1,350 | 502
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss | 152 | 15
Debt Securities | GSE Certificates |  |
Schedule of Investments [Line Items] |  |
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value | 598 | 846
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss | 31 | 28
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Fair Value | 259 | 293
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss | 34 | 17
Temporarily Impaired Available-for-Sale Securities, Total Fair Value | 857 | 1,139
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss | 65 | 45
Debt Securities | GSE CMOs |  |
Schedule of Investments [Line Items] |  |
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value | 792 | 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 | 647 | 926
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss | 88 | 37
Temporarily Impaired Available-for-Sale Securities, Total Fair Value | 1,439 | 1,417
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss | 129 | 45
Debt Securities | Asset-backed Securities |  |
Schedule of Investments [Line Items] |  |
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value | 188 | 130
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss | 3 | 1
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Fair Value | 128 | 135
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss | 3 | 2
Temporarily Impaired Available-for-Sale Securities, Total Fair Value | 316 | 265
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss | 6 | 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 | 313 |
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss | 9 |
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Fair Value | 99 | 99
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss | 1 | 1
Temporarily Impaired Available-for-Sale Securities, Total Fair Value | 412 | 99
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss | 10 | 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 | 47 |
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 | 37 | 37
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss | 7 | 7
Temporarily Impaired Available-for-Sale Securities, Total Fair Value | 84 | 37
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss | 8 | 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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