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Derivative Financial Instruments - Offsetting (Details) - USD ($) | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2024 | Jun. 30, 2024 | Jun. 30, 2025 | Dec. 31, 2024
Derivative Financial Instruments |  |  |  |
Potential reduction in net position of total derivative liabilities |  |  | $ 416,000,000 | $ 352,000,000
Potential reduction in net position of total derivative assets |  |  | 416,000,000 | 352,000,000
Foreign Exchange Call Option |  |  |  |
Derivative Financial Instruments |  |  |  |
Realized gain (loss) on derivatives | $ (18,000,000) | $ (68,000,000) |  |
Fair value of derivatives |  |  | 0 | 0
Other receivables |  |  |  |
Derivative Financial Instruments |  |  |  |
Right to reclaim cash collateral |  |  | $ 25,000,000 | $ 29,000,000

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