Derivatives and Hedge Accounting - Derivatives not designated as hedging instruments (Details) - Derivatives not designated as hedging instruments - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Total	$ (142)	$ (1,098)
Net realized gains (losses) - excluding Fortitude Re funds withheld assets
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Total	(222)	(728)
Net realized gains on Fortitude Re funds withheld assets
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Total	23	25
Net realized gains (losses) on Fortitude Re funds withheld embedded derivatives
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Total	14	(596)
Policy fees
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Total	16	15
Net investment income (loss) - Fortitude Re funds withheld assets
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Total	16	(2)
Policyholder benefits
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Total	0	(2)
Change in the Fair Value of market risk benefits, net
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Total	11	190
Interest rate contracts
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Total	(124)	(22)
Foreign exchange contracts
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Total	17	(219)
Equity contracts
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Total	(616)	(454)
Credit contracts
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Total	(110)	(69)
Other contracts
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Total	23	16
Embedded derivatives
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Total	654	246
Embedded derivatives \| Net realized gains (losses) on Fortitude Re funds withheld embedded derivatives
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Total	$ 14	$ (596)