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Derivative Financial Instruments - Carrying Amounts of Derivative Instruments (Details) - USD ($) $ in Millions | Mar. 31, 2025 | Dec. 31, 2024
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Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Notional Amount | $ 38,139 | $ 34,896
Assets | 737 | 827
Liabilities | 5,240 | 5,121
Derivatives designated as hedging instruments |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Notional Amount | 410 | 39
Assets | 10 | 2
Liabilities | 1 | 0
Derivatives designated as hedging instruments | Interest rate swaps |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Notional Amount | 350 | 0
Assets | 9 | 0
Liabilities | 0 | 0
Derivatives designated as hedging instruments | Foreign currency swaps |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Notional Amount | 60 | 39
Assets | 1 | 2
Liabilities | 1 | 0
Derivatives not designated as hedging instruments |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Notional Amount | 37,729 | 34,857
Assets | 727 | 825
Liabilities | 5,239 | 5,121
Derivatives not designated as hedging instruments | Interest rate swaps |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Notional Amount | 5,655 | 5,145
Assets | 62 | 19
Liabilities | 0 | 10
Derivatives not designated as hedging instruments | Equity options |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Notional Amount | 31,986 | 29,594
Assets | 632 | 773
Liabilities | 1 | 0
Derivatives not designated as hedging instruments | Futures contracts |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Notional Amount | 0 | 0
Assets | 1 | 0
Liabilities | 0 | 0
Derivatives not designated as hedging instruments | Other derivative investments |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Notional Amount | 88 | 118
Assets | 0 | 1
Liabilities | 0 | 0
Derivatives not designated as hedging instruments | Other embedded derivatives |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Notional Amount | 0 | 0
Assets | 32 | 32
Liabilities | 0 | 0
Derivatives not designated as hedging instruments | Indexed annuities/indexed universal life insurance ("IUL") embedded derivatives, included in Contractholder funds |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Notional Amount | 0 | 0
Assets | 0 | 0
Liabilities | 5,316 | 5,220
Derivatives not designated as hedging instruments | Reinsurance related embedded derivatives |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Notional Amount | 0 | 0
Assets | 0 | 0
Liabilities | $ (78) | $ (109)

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