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Investment Securities - Interest Income from Taxable and Non-Taxable Investment Securities (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Investments, Debt and Equity Securities [Abstract] |  |  |  |
Taxable | $ 1,318 | $ 1,241 | $ 3,833 | $ 3,558
Non-taxable | 74 | 75 | 222 | 227
Total interest income from investment securities | $ 1,392 | $ 1,316 | $ 4,055 | $ 3,785

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