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Derivatives - Cash Flow Hedges (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Net realized losses | $ (61) | $ (188) | $ (627)
Net investment income | 2,568 | 2,305 | 2,177
Interest Expense | 199 | 199 | 213
Cash Flow Hedging | Designated as Hedging Instrument |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification and Tax | 27 | (25) | 56
Cash Flow Hedging | Designated as Hedging Instrument | Foreign currency swaps | Reclassification out of Accumulated Other Comprehensive Income |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Gain Reclassified from AOCI into Income | (13) | (16) | 15
Cash Flow Hedging | Designated as Hedging Instrument | Interest Expense [Member] | Reclassification out of Accumulated Other Comprehensive Income |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Gain Reclassified from AOCI into Income | 16 | 15 | (2)
Interest rate swaps | Reclassification out of Accumulated Other Comprehensive Income | Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Net investment income | (25) | (26) | 6
Interest Expense | 16 | 15 | (2)
Interest rate swaps | Cash Flow Hedging | Designated as Hedging Instrument |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification and Tax | (14) | 6 | 0
Interest rate swaps | Cash Flow Hedging | Designated as Hedging Instrument | Foreign currency swaps | Reclassification out of Accumulated Other Comprehensive Income | Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Gain Reclassified from AOCI into Income | (25) | (26) | 6
Interest rate swaps | Cash Flow Hedging | Designated as Hedging Instrument | Interest Expense [Member] | Reclassification out of Accumulated Other Comprehensive Income | Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Gain Reclassified from AOCI into Income | 16 | 15 | (2)
Foreign currency swaps | Reclassification out of Accumulated Other Comprehensive Income | Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Net investment income | 12 | 10 | 9
Foreign currency swaps | Cash Flow Hedging | Designated as Hedging Instrument |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification and Tax | 41 | (31) | 56
Foreign currency swaps | Cash Flow Hedging | Designated as Hedging Instrument | Foreign currency swaps | Reclassification out of Accumulated Other Comprehensive Income | Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Gain Reclassified from AOCI into Income | 12 | 10 | 9
Foreign currency swaps | Cash Flow Hedging | Designated as Hedging Instrument | Interest Expense [Member] | Reclassification out of Accumulated Other Comprehensive Income | Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Gain Reclassified from AOCI into Income | $ 0 | $ 0 | $ 0

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