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Investment Securities - Summary of Unrealized Loss Positions on Investment Securities (Details) - USD ($) $ in Millions | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Less than Twelve Months, Fair Value | $ 3,955 | $ 5,658
Less than Twelve Months, Unrealized Loss | 208 | 122
Twelve Months or Longer, Fair Value | 4,101 | 2,911
Twelve Months or Longer, Unrealized Loss | 982 | 751
Fair Value | 8,056 | 8,569
Unrealized Loss | 1,190 | 873
Debt Securities | U. S. Treasury obligations |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than Twelve Months, Fair Value | 0 | 1,487
Less than Twelve Months, Unrealized Loss | 0 | 4
Twelve Months or Longer, Fair Value | 0 | 0
Twelve Months or Longer, Unrealized Loss | 0 | 0
Fair Value | 0 | 1,487
Unrealized Loss | 0 | 4
Debt Securities | U.S. Government agency and GSE obligations |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than Twelve Months, Fair Value | 216 | 243
Less than Twelve Months, Unrealized Loss | 1 | 5
Twelve Months or Longer, Fair Value | 1,367 | 1,156
Twelve Months or Longer, Unrealized Loss | 382 | 346
Fair Value | 1,583 | 1,399
Unrealized Loss | 383 | 351
Debt Securities | GSE certificates |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than Twelve Months, Fair Value | 341 | 871
Less than Twelve Months, Unrealized Loss | 23 | 46
Twelve Months or Longer, Fair Value | 823 | 420
Twelve Months or Longer, Unrealized Loss | 191 | 114
Fair Value | 1,164 | 1,291
Unrealized Loss | 214 | 160
Debt Securities | Private Label CMOs |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than Twelve Months, Fair Value | 140 |
Less than Twelve Months, Unrealized Loss | 3 |
Twelve Months or Longer, Fair Value | 0 |
Twelve Months or Longer, Unrealized Loss | 0 |
Fair Value | 140 |
Unrealized Loss | 3 |
Debt Securities | GSE CMOs |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than Twelve Months, Fair Value | 3,234 | 2,219
Less than Twelve Months, Unrealized Loss | 180 | 36
Twelve Months or Longer, Fair Value | 1,117 | 925
Twelve Months or Longer, Unrealized Loss | 352 | 264
Fair Value | 4,351 | 3,144
Unrealized Loss | 532 | 300
Debt Securities | Asset-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than Twelve Months, Fair Value | 0 | 61
Less than Twelve Months, Unrealized Loss | 0 | 2
Twelve Months or Longer, Fair Value | 280 | 262
Twelve Months or Longer, Unrealized Loss | 6 | 12
Fair Value | 280 | 323
Unrealized Loss | 6 | 14
Debt Securities | Municipal bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than Twelve Months, Fair Value | 0 | 9
Less than Twelve Months, Unrealized Loss | 0 | 0
Twelve Months or Longer, Fair Value | 6 | 7
Twelve Months or Longer, Unrealized Loss | 1 | 0
Fair Value | 6 | 16
Unrealized Loss | 1 | 0
Debt Securities | Corporate bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than Twelve Months, Fair Value | 0 | 698
Less than Twelve Months, Unrealized Loss | 0 | 27
Twelve Months or Longer, Fair Value | 405 | 97
Twelve Months or Longer, Unrealized Loss | 35 | 3
Fair Value | 405 | 795
Unrealized Loss | 35 | 30
Debt Securities | Foreign notes |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than Twelve Months, Fair Value | 24 | 20
Less than Twelve Months, Unrealized Loss | 1 | 0
Twelve Months or Longer, Fair Value | 9 | 0
Twelve Months or Longer, Unrealized Loss | 1 | 0
Fair Value | 33 | 20
Unrealized Loss | 2 | 0
Debt Securities | Capital trust notes |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than Twelve Months, Fair Value | 0 | 46
Less than Twelve Months, Unrealized Loss | 0 | 2
Twelve Months or Longer, Fair Value | 81 | 34
Twelve Months or Longer, Unrealized Loss | 11 | 10
Fair Value | 81 | 80
Unrealized Loss | 11 | 12
Equity Securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than Twelve Months, Fair Value | 0 | 4
Less than Twelve Months, Unrealized Loss | 0 | 0
Twelve Months or Longer, Fair Value | 13 | 10
Twelve Months or Longer, Unrealized Loss | 3 | 2
Fair Value | 13 | 14
Unrealized Loss | $ 3 | $ 2

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