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Fair Values - Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Millions | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Investment securities: |  |
Equity securities | $ 64 | $ 66
Debt securities | 2,168 | 2,120
Derivative, gross, assets | 183 | 80
Total Assets | 2,415 | 2,266
Liabilities |  |
Derivatives, gross, liabilities | 359 | 977
Total Liabilities | 359 | 977
Level 1 |  |
Investment securities: |  |
Equity securities | 64 | 66
Debt securities | 0 | 0
Derivative, gross, assets | 0 | 0
Total Assets | 64 | 66
Liabilities |  |
Derivatives, gross, liabilities | 0 | 0
Total Liabilities | 0 | 0
Level 2 |  |
Investment securities: |  |
Equity securities | 0 | 0
Debt securities | 2,094 | 2,046
Derivative, gross, assets | 169 | 62
Total Assets | 2,263 | 2,108
Liabilities |  |
Derivatives, gross, liabilities | 359 | 977
Total Liabilities | 359 | 977
Level 3 |  |
Investment securities: |  |
Equity securities | 0 | 0
Debt securities | 74 | 74
Derivative, gross, assets | 14 | 18
Total Assets | 88 | 92
Liabilities |  |
Derivatives, gross, liabilities | 0 | 0
Total Liabilities | $ 0 | $ 0

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