Derivative Instruments (Non Hedging Derivatives and Embedded Derivatives Effect on Income Statement) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Income Affect Of Non Hedging Derivatives [Line Items]
Total investment related gains (losses), net	$ (745)	$ (481)	$ (539)
Other revenues	(593)	(372)	(527)
Gain Loss On Investments Related To Change In Fair Value Of Derivatives Excluding Embedded Derivatives	(227)	(125)	(172)
Indexed annuity products	(1,087)	(864)	(682)
Not Designated as Hedging Instrument [Member]
Income Affect Of Non Hedging Derivatives [Line Items]
Total investment related gains (losses), net	(133)	(271)	(247)
Not Designated as Hedging Instrument [Member] | Interest Rate Swap [Member]
Income Affect Of Non Hedging Derivatives [Line Items]
Total investment related gains (losses), net	(49)	(15)	(131)
Not Designated as Hedging Instrument [Member] | Future [Member]
Income Affect Of Non Hedging Derivatives [Line Items]
Total investment related gains (losses), net	(28)	(31)	22
Not Designated as Hedging Instrument [Member] | Currency Swap [Member]
Income Affect Of Non Hedging Derivatives [Line Items]
Total investment related gains (losses), net	29	17	21
Not Designated as Hedging Instrument [Member] | Foreign Exchange Forward [Member]
Income Affect Of Non Hedging Derivatives [Line Items]
Total investment related gains (losses), net	(167)	(98)	(93)
Not Designated as Hedging Instrument [Member] | Consumer Price Index Swap [Member]
Income Affect Of Non Hedging Derivatives [Line Items]
Total investment related gains (losses), net	(4)	6	31
Not Designated as Hedging Instrument [Member] | Credit Default Swap [Member]
Income Affect Of Non Hedging Derivatives [Line Items]
Total investment related gains (losses), net	15	42	(66)
Not Designated as Hedging Instrument [Member] | Equity [Member]
Income Affect Of Non Hedging Derivatives [Line Items]
Total investment related gains (losses), net	(5)	(28)	14
Not Designated as Hedging Instrument [Member] | Embedded Derivatives In Modified Coinsurance Or Funds Withheld Arrangements [Member]
Income Affect Of Non Hedging Derivatives [Line Items]
Total investment related gains (losses), net	116	(163)	(173)
Not Designated as Hedging Instrument [Member] | Embedded Derivatives In Indexed Annuity [Member]
Income Affect Of Non Hedging Derivatives [Line Items]
Indexed annuity products	(22)	(17)	(98)
Not Designated as Hedging Instrument [Member] | Interest Rate Swaption
Income Affect Of Non Hedging Derivatives [Line Items]
Total investment related gains (losses), net	(6)	(33)	3
Not Designated as Hedging Instrument [Member] | Total Return Swap [Member]
Income Affect Of Non Hedging Derivatives [Line Items]
Total investment related gains (losses), net	(7)	14	21
Not Designated as Hedging Instrument [Member] | Interest Rate Future
Income Affect Of Non Hedging Derivatives [Line Items]
Total investment related gains (losses), net	2	1	6
Not Designated as Hedging Instrument [Member] | Foreign Exchange Option
Income Affect Of Non Hedging Derivatives [Line Items]
Total investment related gains (losses), net	$ (7)	$ 0	$ 0