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Investment Securities - Held-to-Maturity Securities (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Schedule of Held-to-Maturity Securities [Line Items] |  |  |
Amortized Cost | [1] | $ 76,931 | $ 78,634
Unrealized Gains |  | 86 | 6
Unrealized Losses |  | (9,671) | (12,365)
Fair Value |  | 67,346 | 66,275
U.S. Treasury and agencies |  |  |
Schedule of Held-to-Maturity Securities [Line Items] |  |  |
Amortized Cost |  | 647 | 1,296
Unrealized Gains |  | 0 | 0
Unrealized Losses |  | (6) | (21)
Fair Value |  | 641 | 1,275
Residential mortgage-backed securities | Agency |  |  |
Schedule of Held-to-Maturity Securities [Line Items] |  |  |
Amortized Cost |  | 74,326 | 75,392
Unrealized Gains |  | 61 | 3
Unrealized Losses |  | (9,663) | (12,317)
Fair Value |  | 64,724 | 63,078
Commercial mortgage-backed securities | Agency |  |  |
Schedule of Held-to-Maturity Securities [Line Items] |  |  |
Amortized Cost |  | 1,696 | 1,702
Unrealized Gains |  | 22 | 0
Unrealized Losses |  | (2) | (27)
Fair Value |  | 1,716 | 1,675
Other |  |  |
Schedule of Held-to-Maturity Securities [Line Items] |  |  |
Amortized Cost |  | 262 | 244
Unrealized Gains |  | 3 | 3
Unrealized Losses |  | 0 | 0
Fair Value |  | $ 265 | $ 247
[1] | Includes only collateral pledged by the Company where counterparties have the right to sell or pledge the collateral.

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