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Investment Securities - Summary of Unrealized Loss Positions on Investment Securities (Details) - USD ($) $ in Millions | Jun. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Less than Twelve Months, Fair Value | $ 807 | $ 2,357
Less than Twelve Months, Unrealized Loss | 2 | 84
Twelve Months or Longer, Fair Value | 6,015 | 4,198
Twelve Months or Longer, Unrealized Loss | 957 | 777
Fair Value | 6,822 | 6,555
Unrealized Loss | 959 | 861
Other Debt Securities: | U.S. Government agency and GSE obligations |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than Twelve Months, Fair Value | 0 | 181
Less than Twelve Months, Unrealized Loss | 0 | 1
Twelve Months or Longer, Fair Value | 1,345 | 1,362
Twelve Months or Longer, Unrealized Loss | 308 | 290
Fair Value | 1,345 | 1,543
Unrealized Loss | 308 | 291
Other Debt Securities: | GSE certificates |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than Twelve Months, Fair Value | 46 | 312
Less than Twelve Months, Unrealized Loss | 0 | 5
Twelve Months or Longer, Fair Value | 1,085 | 843
Twelve Months or Longer, Unrealized Loss | 166 | 141
Fair Value | 1,131 | 1,155
Unrealized Loss | 166 | 146
Other Debt Securities: | Private Label collateralized mortgage obligations |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than Twelve Months, Fair Value | 0 | 29
Less than Twelve Months, Unrealized Loss | 0 | 1
Twelve Months or Longer, Fair Value | 17 | 0
Twelve Months or Longer, Unrealized Loss | 1 | 0
Fair Value | 17 | 29
Unrealized Loss | 1 | 1
Other Debt Securities: | GSE collateralized mortgage obligations |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than Twelve Months, Fair Value | 761 | 1,835
Less than Twelve Months, Unrealized Loss | 2 | 77
Twelve Months or Longer, Fair Value | 2,925 | 1,312
Twelve Months or Longer, Unrealized Loss | 443 | 304
Fair Value | 3,686 | 3,147
Unrealized Loss | 445 | 381
Other Debt Securities: | Asset-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than Twelve Months, Fair Value | 0 | 0
Less than Twelve Months, Unrealized Loss | 0 | 0
Twelve Months or Longer, Fair Value | 193 | 228
Twelve Months or Longer, Unrealized Loss | 3 | 5
Fair Value | 193 | 228
Unrealized Loss | 3 | 5
Other Debt Securities: | Municipal bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than Twelve Months, Fair Value | 0 | 0
Less than Twelve Months, Unrealized Loss | 0 | 0
Twelve Months or Longer, Fair Value | 5 | 6
Twelve Months or Longer, Unrealized Loss | 0 | 0
Fair Value | 5 | 6
Unrealized Loss | 0 | 0
Other Debt Securities: | Corporate bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than Twelve Months, Fair Value | 0 | 0
Less than Twelve Months, Unrealized Loss | 0 | 0
Twelve Months or Longer, Fair Value | 341 | 343
Twelve Months or Longer, Unrealized Loss | 23 | 22
Fair Value | 341 | 343
Unrealized Loss | 23 | 22
Other Debt Securities: | Foreign notes |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than Twelve Months, Fair Value | 0 | 0
Less than Twelve Months, Unrealized Loss | 0 | 0
Twelve Months or Longer, Fair Value | 10 | 9
Twelve Months or Longer, Unrealized Loss | 0 | 1
Fair Value | 10 | 9
Unrealized Loss | 0 | 1
Other Debt Securities: | Capital trust notes |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than Twelve Months, Fair Value | 0 | 0
Less than Twelve Months, Unrealized Loss | 0 | 0
Twelve Months or Longer, Fair Value | 80 | 81
Twelve Months or Longer, Unrealized Loss | 11 | 12
Fair Value | 80 | 81
Unrealized Loss | 11 | 12
Equity securities: |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than Twelve Months, Fair Value | 0 | 0
Less than Twelve Months, Unrealized Loss | 0 | 0
Twelve Months or Longer, Fair Value | 14 | 14
Twelve Months or Longer, Unrealized Loss | 2 | 2
Fair Value | 14 | 14
Unrealized Loss | $ 2 | $ 2

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