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Derivative Instruments (Non Hedging Derivatives and Embedded Derivatives Effect on Income Statement) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Income Affect Of Non Hedging Derivatives [Line Items] |  |  |  |
Total investment related gains (losses), net | $ 13 | $ (78) | $ (110) | $ (498)
Interest credited | (547) | (310) | (1,160) | (795)
Not Designated as Hedging Instrument |  |  |  |
Income Affect Of Non Hedging Derivatives [Line Items] |  |  |  |
Total investment related gains (losses), net | (100) | (40) | (28) | (165)
Gain Loss On Investments Related To Change In Fair Value Of Derivatives Excluding Embedded Derivatives | 32 | 87 | 80 | (129)
Not Designated as Hedging Instrument | Interest Rate Swaps |  |  |  |
Income Affect Of Non Hedging Derivatives [Line Items] |  |  |  |
Total investment related gains (losses), net | 1 | 13 | 6 | (31)
Not Designated as Hedging Instrument | Financial Futures |  |  |  |
Income Affect Of Non Hedging Derivatives [Line Items] |  |  |  |
Total investment related gains (losses), net | (13) | (12) | (25) | (31)
Not Designated as Hedging Instrument | Currency Swap [Member] |  |  |  |
Income Affect Of Non Hedging Derivatives [Line Items] |  |  |  |
Total investment related gains (losses), net | 6 | (7) | 1 | 15
Not Designated as Hedging Instrument | Foreign Currency Forwards |  |  |  |
Income Affect Of Non Hedging Derivatives [Line Items] |  |  |  |
Total investment related gains (losses), net | (40) | 77 | 22 | (85)
Not Designated as Hedging Instrument | Consumer Price Index Swap [Member] |  |  |  |
Income Affect Of Non Hedging Derivatives [Line Items] |  |  |  |
Total investment related gains (losses), net | 3 | (1) | (3) | (2)
Not Designated as Hedging Instrument | Equity Options |  |  |  |
Income Affect Of Non Hedging Derivatives [Line Items] |  |  |  |
Total investment related gains (losses), net | 30 | 1 | 35 | (4)
Not Designated as Hedging Instrument | Embedded Derivatives In Modified Coinsurance Or Funds Withheld Arrangements |  |  |  |
Income Affect Of Non Hedging Derivatives [Line Items] |  |  |  |
Total investment related gains (losses), net | (33) | (112) | (41) | (9)
Not Designated as Hedging Instrument | Embedded Derivatives In Indexed Annuity [Member] |  |  |  |
Income Affect Of Non Hedging Derivatives [Line Items] |  |  |  |
Policyholder Account Balance, Period Increase (Decrease) | (99) | (15) | (67) | (27)
Not Designated as Hedging Instrument | Interest Rate Future |  |  |  |
Income Affect Of Non Hedging Derivatives [Line Items] |  |  |  |
Total investment related gains (losses), net | 0 | 0 | 0 | 2
Not Designated as Hedging Instrument | Total Return Swap |  |  |  |
Income Affect Of Non Hedging Derivatives [Line Items] |  |  |  |
Total investment related gains (losses), net | 16 | 7 | 16 | 0
Not Designated as Hedging Instrument | Interest Rate Swaption |  |  |  |
Income Affect Of Non Hedging Derivatives [Line Items] |  |  |  |
Total investment related gains (losses), net | (2) | (3) | (3) | (6)
Not Designated as Hedging Instrument | Credit Default Swaps |  |  |  |
Income Affect Of Non Hedging Derivatives [Line Items] |  |  |  |
Total investment related gains (losses), net | 33 | 10 | 36 | 14
Not Designated as Hedging Instrument | Foreign Exchange Option |  |  |  |
Income Affect Of Non Hedging Derivatives [Line Items] |  |  |  |
Total investment related gains (losses), net | $ (2) | $ 2 | $ (5) | $ (1)

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- Definition This item represents the amount recognized in investment related gains (losses) related to the change in the fair value of derivatives, excluding embedded derivatives. + References No definition available. + Details
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- Definition Changes in estimated fair value related to embedded derivatives Abstract. + References No definition available. + Details
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- Definition Amount of realized and unrealized gain (loss) on investment. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(9)(a)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147483621/220-10-S99-2 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(7)(c)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147483621/220-10-S99-2 Reference 3: http://www.xbrl.org/2003/role/recommendedDisclosureRef -Topic 230 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 28 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-28 + Details
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