Investments (Supplemental Net Investment Income) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Net Investment Income [Line Items]
Debt and Equity Securities, Realized Gain (Loss)	$ (821)	$ (725)	$ 1,229
Equity Securities, FV-NI, Unrealized Gain (Loss)	60	(86)	177
Income (Loss) from Equity Method Investments	151	1,305	5,136
Net investment income
Net Investment Income [Line Items]
Debt and Equity Securities, Realized Gain (Loss)	207	155	518
Debt and Equity Securities, Unrealized Gain (Loss)	1,168	(1,586)	616
Debt and Equity Securities, Gain (Loss)	1,375	(1,431)	1,134
Unit-linked investments
Net Investment Income [Line Items]
Equity Securities, FV-NI, Unrealized Gain (Loss)	$ 1,119	$ (1,286)	$ 730