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Investment Securities (Investment Income) (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2024 | Mar. 31, 2023
Investments, Debt and Equity Securities [Abstract] |  |
Taxable interest | $ 245 | $ 217
Taxable dividends | 4 | 3
Interest and dividends exempt from U.S. federal income tax | 6 | 6
Interest and dividends on investment securities | $ 255 | $ 226

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