Investments (Supplemental Net Investment Income) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Net Investment Income [Line Items]
Net realized investment gains (losses) from sales and disposals of investments	$ (43)	$ (129)	$ (301)	$ (196)
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)	63	(19)	73	11
Income (Loss) from Equity Method Investments	238	276	505	486
Net investment income
Net Investment Income [Line Items]
Net realized investment gains (losses) from sales and disposals of investments	102	66	145	134
Debt and Equity Securities, Unrealized Gain (Loss)	452	139	163	719
Debt and Equity Securities, Gain (Loss)	554	205	308	853
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)	$ 532	$ 151	$ 248	$ 663