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Investment Securities - Available-For-Sale Securities (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Debt Securities, Available-for-Sale [Line Items] |  |  |
Amortized Cost |  | $ 94,121 | $ 92,793
Unrealized Gains |  | 295 | 58
Unrealized Losses |  | (5,351) | (6,859)
Fair Value | [1] | 89,065 | 85,992
Portfolio level basis adjustments, Amortized Cost |  | 304 | 13
Portfolio level basis adjustments, Unrealized Losses |  | (304) | (13)
U.S. Treasury and agencies |  |  |
Debt Securities, Available-for-Sale [Line Items] |  |  |
Amortized Cost |  | 28,556 | 30,467
Unrealized Gains |  | 10 | 1
Unrealized Losses |  | (1,498) | (2,081)
Fair Value |  | 27,068 | 28,387
Residential mortgage-backed securities | Agency |  |  |
Debt Securities, Available-for-Sale [Line Items] |  |  |
Amortized Cost |  | 38,921 | 35,558
Unrealized Gains |  | 245 | 13
Unrealized Losses |  | (1,489) | (2,290)
Fair Value |  | 37,677 | 33,281
Commercial mortgage-backed securities | Agency |  |  |
Debt Securities, Available-for-Sale [Line Items] |  |  |
Amortized Cost |  | 8,655 | 8,673
Unrealized Gains |  | 0 | 0
Unrealized Losses |  | (961) | (1,322)
Fair Value |  | 7,694 | 7,351
Commercial mortgage-backed securities | Non-agency |  |  |
Debt Securities, Available-for-Sale [Line Items] |  |  |
Amortized Cost |  | 7 | 7
Unrealized Gains |  | 0 | 0
Unrealized Losses |  | 0 | (1)
Fair Value |  | 7 | 6
Asset-backed securities |  |  |
Debt Securities, Available-for-Sale [Line Items] |  |  |
Amortized Cost |  | 6,842 | 7,136
Unrealized Gains |  | 23 | 30
Unrealized Losses |  | 0 | (1)
Fair Value |  | 6,865 | 7,165
Obligations of state and political subdivisions |  |  |
Debt Securities, Available-for-Sale [Line Items] |  |  |
Amortized Cost |  | 10,571 | 10,690
Unrealized Gains |  | 14 | 13
Unrealized Losses |  | (1,099) | (1,151)
Fair Value |  | 9,486 | 9,552
Other |  |  |
Debt Securities, Available-for-Sale [Line Items] |  |  |
Amortized Cost |  | 265 | 249
Unrealized Gains |  | 3 | 1
Unrealized Losses |  | 0 | 0
Fair Value |  | 268 | 250
Excluding portfolio level basis adjustments |  |  |
Debt Securities, Available-for-Sale [Line Items] |  |  |
Amortized Cost |  | 93,817 | 92,780
Unrealized Gains |  | 295 | 58
Unrealized Losses |  | (5,047) | (6,846)
Fair Value |  | $ 89,065 | $ 85,992
[1] | Includes only collateral pledged by the Company where counterparties have the right to sell or pledge the collateral.

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