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Investment Securities - Summary of Unrealized Loss Positions on Investment Securities (Details) - USD ($) $ in Millions | Jun. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Less than Twelve Months, Fair Value | $ 3,171 | $ 5,658
Less than Twelve Months, Unrealized Loss | 104 | 122
Twelve Months or Longer, Fair Value | 4,090 | 2,911
Twelve Months or Longer, Unrealized Loss | 824 | 752
Fair Value | 7,261 | 8,569
Unrealized Loss | 928 | 874
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 | 221 | 243
Less than Twelve Months, Unrealized Loss | 1 | 5
Twelve Months or Longer, Fair Value | 1,399 | 1,156
Twelve Months or Longer, Unrealized Loss | 328 | 346
Fair Value | 1,620 | 1,399
Unrealized Loss | 329 | 351
Debt Securities | GSE certificates |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than Twelve Months, Fair Value | 458 | 871
Less than Twelve Months, Unrealized Loss | 14 | 46
Twelve Months or Longer, Fair Value | 739 | 420
Twelve Months or Longer, Unrealized Loss | 148 | 114
Fair Value | 1,197 | 1,291
Unrealized Loss | 162 | 160
Debt Securities | Private Label CMOs |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than Twelve Months, Fair Value | 20 |
Less than Twelve Months, Unrealized Loss | 1 |
Twelve Months or Longer, Fair Value | 0 |
Twelve Months or Longer, Unrealized Loss | 0 |
Fair Value | 20 |
Unrealized Loss | 1 |
Debt Securities | GSE CMOs |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than Twelve Months, Fair Value | 2,391 | 2,219
Less than Twelve Months, Unrealized Loss | 81 | 36
Twelve Months or Longer, Fair Value | 1,182 | 925
Twelve Months or Longer, Unrealized Loss | 288 | 264
Fair Value | 3,573 | 3,144
Unrealized Loss | 369 | 300
Debt Securities | Asset-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than Twelve Months, Fair Value | 34 | 61
Less than Twelve Months, Unrealized Loss | 0 | 2
Twelve Months or Longer, Fair Value | 289 | 262
Twelve Months or Longer, Unrealized Loss | 9 | 12
Fair Value | 323 | 323
Unrealized Loss | 9 | 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 | 38 | 698
Less than Twelve Months, Unrealized Loss | 5 | 27
Twelve Months or Longer, Fair Value | 383 | 97
Twelve Months or Longer, Unrealized Loss | 34 | 4
Fair Value | 421 | 795
Unrealized Loss | 39 | 31
Debt Securities | Foreign notes |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than Twelve Months, Fair Value | 8 | 20
Less than Twelve Months, Unrealized Loss | 2 | 0
Twelve Months or Longer, Fair Value | 0 | 0
Twelve Months or Longer, Unrealized Loss | 0 | 0
Fair Value | 8 | 20
Unrealized Loss | 2 | 0
Debt Securities | Capital trust notes |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than Twelve Months, Fair Value | 1 | 46
Less than Twelve Months, Unrealized Loss | 0 | 2
Twelve Months or Longer, Fair Value | 78 | 34
Twelve Months or Longer, Unrealized Loss | 14 | 10
Fair Value | 79 | 80
Unrealized Loss | 14 | 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 | 14 | 10
Twelve Months or Longer, Unrealized Loss | 2 | 2
Fair Value | 14 | 14
Unrealized Loss | $ 2 | $ 2

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