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Fair Values - Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Investment securities: |  |
Equity securities | $ 66 | $ 41
Debt securities | 2,120 | 4,537
Derivatives, gross | 80 | 521
Total Assets | 2,266 | 5,099
Liabilities |  |
Derivatives, gross | 977 | 801
Total Liabilities | 977 | 801
Fair Value, Inputs, Level 1 |  |
Investment securities: |  |
Equity securities | 66 | 40
Debt securities | 0 | 0
Derivatives, gross | 0 | 0
Total Assets | 66 | 40
Liabilities |  |
Derivatives, gross | 0 | 0
Total Liabilities | 0 | 0
Fair Value, Inputs, Level 2 |  |
Investment securities: |  |
Equity securities | 0 | 1
Debt securities | 2,046 | 4,490
Derivatives, gross | 62 | 494
Total Assets | 2,108 | 4,985
Liabilities |  |
Derivatives, gross | 977 | 801
Total Liabilities | 977 | 801
Fair Value, Inputs, Level 3 |  |
Investment securities: |  |
Equity securities | 0 | 0
Debt securities | 74 | 47
Derivatives, gross | 18 | 27
Total Assets | 92 | 74
Liabilities |  |
Derivatives, gross | 0 | 0
Total Liabilities | $ 0 | $ 0

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