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Derivative Financial Instruments - Schedule of Carrying Amount of Derivative Instruments (Details) - USD ($) $ in Millions | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Derivative [Line Items] |  |
Total asset derivatives | $ 1,435 | $ 977
Total liability derivatives | 5,449 | 4,259
Derivative investments: | Equity options |  |
Derivative [Line Items] |  |
Total asset derivatives | 1,293 | 739
Derivative investments: | Interest rate swaps |  |
Derivative [Line Items] |  |
Total asset derivatives | 108 | 57
Derivative investments: | Other derivative investments |  |
Derivative [Line Items] |  |
Total asset derivatives | 0 | 1
Other embedded derivatives | Other embedded derivatives |  |
Derivative [Line Items] |  |
Total asset derivatives | 34 | 28
Prepaid expenses and other assets: | Reinsurance related embedded derivatives |  |
Derivative [Line Items] |  |
Total asset derivatives | 0 | 152
Contractholder funds: | Indexed annuities/indexed universal life insurance ("IUL") embedded derivatives, included in contractholder funds |  |
Derivative [Line Items] |  |
Total liability derivatives | 5,411 | 4,258
Accounts payable and accrued liabilities: | Equity options |  |
Derivative [Line Items] |  |
Total liability derivatives | 4 | 1
Accounts payable and accrued liabilities: | Reinsurance related embedded derivatives |  |
Derivative [Line Items] |  |
Total liability derivatives | $ 34 | $ 0

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