Investments (Supplemental Net Investment Income) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Net Investment Income [Line Items]
Debt and Equity Securities, Realized Gain (Loss)	$ (67)	$ (508)
Equity Securities, FV-NI, Unrealized Gain (Loss)	30	41
Income (Loss) from Equity Method Investments	210	(93)
Net investment income
Net Investment Income [Line Items]
Debt and Equity Securities, Realized Gain (Loss)	68	38
Debt and Equity Securities, Unrealized Gain (Loss)	580	322
Debt and Equity Securities, Gain (Loss)	648	360
Unit-linked investments
Net Investment Income [Line Items]
Equity Securities, FV-NI, Unrealized Gain (Loss)	$ 537	$ 313