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Fair Values - Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Investment securities: |  |
Equity securities | $ 48 | $ 66
Debt securities | 1,192 | 2,120
Derivatives, gross | 1,006 | 80
Total Assets | 2,246 | 2,266
Liabilities |  |
Derivatives, gross | 131 | 977
Total Liabilities | 131 | 977
Fair Value, Inputs, Level 1 |  |
Investment securities: |  |
Equity securities | 48 | 66
Debt securities | 0 | 0
Derivatives, gross | 0 | 0
Total Assets | 48 | 66
Liabilities |  |
Derivatives, gross | 0 | 0
Total Liabilities | 0 | 0
Fair Value, Inputs, Level 2 |  |
Investment securities: |  |
Equity securities | 0 | 0
Debt securities | 1,115 | 2,046
Derivatives, gross | 975 | 62
Total Assets | 2,090 | 2,108
Liabilities |  |
Derivatives, gross | 131 | 977
Total Liabilities | 131 | 977
Fair Value, Inputs, Level 3 |  |
Investment securities: |  |
Equity securities | 0 | 0
Debt securities | 77 | 74
Derivatives, gross | 31 | 18
Total Assets | 108 | 92
Liabilities |  |
Derivatives, gross | 0 | 0
Total Liabilities | $ 0 | $ 0

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