Investments (Supplemental Net Investment Income) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Net Investment Income [Line Items]
Net realized investment gains (losses) from sales and disposals of investments	$ 26	$ (234)	$ (170)	$ (721)
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)	(58)	(14)	(47)	44
Income (Loss) from Equity Method Investments	201	95	687	174
Net investment income
Net Investment Income [Line Items]
Net realized investment gains (losses) from sales and disposals of investments	65	47	199	126
Debt and Equity Securities, Unrealized Gain (Loss)	121	(80)	840	572
Debt and Equity Securities, Gain (Loss)	186	(33)	1,039	698
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)	$ 209	$ (63)	$ 813	$ 506