Investments (Supplemental Net Investment Gains (Losses)) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Net Investment Income [Line Items]
Equity Securities, FV-NI, Unrealized Gain (Loss)	$ (65)	$ 60	$ (86)
Realized gains (losses) on investments sold or disposed	(436)	(1,028)	(880)
Investments Impairment	101	1,498	40
Gains (losses) on leveraged leases and renewable energy partnerships	12	24	33
Foreign Currency Transaction Gain (Loss), Realized	(79)	52	183
Debt and Equity Securities, Realized Gain (Loss)	(166)	(821)	(725)
Cash Flow Hedging [Member]
Net Investment Income [Line Items]
Realized gains (losses) on investments sold or disposed	(3)	(7)	38
Equity Securities
Net Investment Income [Line Items]
Equity Securities, FV-NI, Unrealized Gain (Loss)	$ (39)	$ 22	$ (89)