Investments (Supplemental Net Investment Income) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Net Investment Income [Line Items]
Net realized investment gains (losses) from sales and disposals of investments	$ (129)	$ 21	$ (196)	$ (487)
Changes in estimated fair value subsequent to purchase of equity securities still held at the end of the respective periods and recognized in net investment gains (losses)	(19)	17	11	58
Income (Loss) from Equity Method Investments	276	172	486	79
Net investment income
Net Investment Income [Line Items]
Net realized investment gains (losses) from sales and disposals of investments	66	41	134	79
Debt and Equity Securities, Unrealized Gain (Loss)	139	330	719	652
Debt and Equity Securities, Gain (Loss)	205	371	853	731
Unit-linked investments
Net Investment Income [Line Items]
Changes in estimated fair value subsequent to purchase of equity securities still held at the end of the respective periods and recognized in net investment gains (losses)	$ 151	$ 291	$ 663	$ 591