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Investment Securities - Amortized Cost, Gross Unrealized Gains and Losses, and Fair Value of Securities Available for Sale and Held to Maturity (Details) - USD ($) $ in Millions | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2025 | Dec. 31, 2024
Available for sale securities |  |
Amortized Cost | $ 66,698 | $ 89,704
Gross Unrealized Gains | 3 | 1
Gross Unrealized Losses | 4,393 | 6,711
Fair Value | 62,308 | 82,994
Unallocated portfolio layer method (PLM) fair value basis adjustments, Amortized Cost | 8 | (47)
Unallocated portfolio layer method fair value basis adjustments, Gross Unrealized Gains | 0 | 0
Unallocated portfolio layer method fair value basis adjustments, Gross Unrealized Losses | 8 | (47)
Held to maturity securities |  |
Amortized Cost | 136,693 | 146,453
Gross Unrealized Gains | 1,672 | 146
Gross Unrealized Losses | 10,106 | 13,994
Fair Value | 128,259 | 132,605
U.S. agency mortgage-backed securities |  |
Available for sale securities |  |
Amortized Cost | 48,011 | 57,262
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 3,555 | 5,429
Fair Value | 44,456 | 51,833
Held to maturity securities |  |
Amortized Cost | 136,693 | 146,453
Gross Unrealized Gains | 1,672 | 146
Gross Unrealized Losses | 10,106 | 13,994
Fair Value | 128,259 | 132,605
U.S. Treasury securities |  |
Available for sale securities |  |
Amortized Cost | 8,009 | 14,939
Gross Unrealized Gains | 3 | 1
Gross Unrealized Losses | 226 | 471
Fair Value | 7,786 | 14,469
Corporate debt securities |  |
Available for sale securities |  |
Amortized Cost | 5,502 | 10,166
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 411 | 587
Fair Value | 5,091 | 9,579
Asset-backed securities |  |
Available for sale securities |  |
Amortized Cost | 4,429 | 6,106
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 148 | 196
Fair Value | 4,281 | 5,910
U.S. state and municipal securities |  |
Available for sale securities |  |
Amortized Cost | 597 | 603
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 35 | 54
Fair Value | 562 | 549
Foreign government agency securities |  |
Available for sale securities |  |
Amortized Cost |  | 533
Gross Unrealized Gains |  | 0
Gross Unrealized Losses |  | 6
Fair Value |  | 527
Non-agency commercial mortgage-backed securities |  |
Available for sale securities |  |
Amortized Cost | 121 | 121
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 8 | 12
Fair Value | 113 | 109
Other |  |
Available for sale securities |  |
Amortized Cost | 21 | 21
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 2 | 3
Fair Value | $ 19 | $ 18
Corporate Debt Securities Issued By Financial Services Industry | Asset-backed securities | Financial Instrument Concentration Risk |  |
Held to maturity securities |  |
Concentration (percent) | 15.00% | 35.00%
Corporate Debt Securities Issued By Information Technology Industry | Asset-backed securities | Financial Instrument Concentration Risk |  |
Held to maturity securities |  |
Concentration (percent) | 25.00% | 16.00%
Corporate Debt Securities Issued By Consumer Staples Industry | Asset-backed securities | Financial Instrument Concentration Risk |  |
Held to maturity securities |  |
Concentration (percent) | 24.00% | 18.00%
Federal Family Education Loan Program (FFELP) Guaranteed Loans | Asset-backed securities | Financial Instrument Concentration Risk |  |
Held to maturity securities |  |
Concentration (percent) | 71.00% | 62.00%
Collateralized Credit Card Securities | Asset-backed securities | Financial Instrument Concentration Risk |  |
Held to maturity securities |  |
Concentration (percent) | 21.00% | 25.00%

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