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Derivatives - Non-qualifying Strategies (Details) - Not Designated as Hedging Instrument - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Non-qualifying foreign currency derivatives | $ (11) | $ (6) | $ (11) | $ (8)
Interest rate swaps and futures |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Non-qualifying foreign currency derivatives | (1) | (6) | (2) | (3)
Equity Option [Member] |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Non-qualifying foreign currency derivatives | $ (10) | $ 0 | $ (9) | $ (5)

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