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Investments (Components of Net Investment Gains Losses - Transaction Type) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Gain (Loss) on Securities [Line Items]
Realized gains (losses) on investments sold or disposed	$ 22	$ (39)	$ (424)	$ (369)
Impairment (losses)	16	17	23	17
Change in ACL recognized in earnings	(254)	(150)	(685)	(231)
Unrealized net gains (losses) recognized in earnings	11	(59)	84	(42)
Total recognized gains (losses)	(243)	(209)	(601)	(273)
Non-investment portfolio gains (losses)	(88)	188	63	(214)
Net investment gains (losses)	$ (325)	$ (77)	(985)	(873)
Private Equity Funds
Gain (Loss) on Securities [Line Items]
Realized gains (losses) on investments sold or disposed			2	46
Portfolio of investments, amount sold			43	798
Proceeds from sale of equity method investment			$ 41	$ 752

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