Investments (Evaluation of Fixed Maturity Securities AFS in an Unrealized Loss Position - Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Debt Securities, Available-for-sale [Line Items]
Change in Gross Unrealized Temporary Loss	$ 10,325	$ (56,497)	$ (12,840)
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	25,800
Equal to or Greater than 12 Months ,Gross Unrealized Loss	24,394	10,889
Below Investment Grade
Debt Securities, Available-for-sale [Line Items]
Equal to or Greater than 12 Months ,Gross Unrealized Loss	719	$ 591
Fixed maturity securities without an allowance for credit loss
Debt Securities, Available-for-sale [Line Items]
Change in Gross Unrealized Temporary Loss	$ 8,500