Investments (Evaluation of Fixed Maturity Securities AFS in an Unrealized Loss Position- Narrative) (Details) $ in Millions	9 Months Ended
	Sep. 30, 2023 USD ($)	Dec. 31, 2022 USD ($)
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 38,600
Equal to or Greater than 12 Months Gross Unrealized Loss	$ 34,416	$ 10,889
Percentage of Gross Unrealized Loss for 12 months or greater	89.00%
Total number of securities in an unrealized loss position equal or greater than 12 months	13,507	4,303
Investment Grade
Debt Securities, Available-for-sale [Line Items]
Equal to or Greater than 12 Months Gross Unrealized Loss	$ 33,441	$ 10,298
Percentage of Gross Unrealized Loss for 12 months or greater	97.00%
Total number of securities in an unrealized loss position equal or greater than 12 months	12,591
Below Investment Grade
Debt Securities, Available-for-sale [Line Items]
Equal to or Greater than 12 Months Gross Unrealized Loss	$ 975	$ 591
Percentage of Gross Unrealized Loss for 12 months or greater	3.00%
Total number of securities in an unrealized loss position equal or greater than 12 months	916
Fixed maturity securities without an allowance for credit loss
Debt Securities, Available-for-sale [Line Items]
Change in Gross Unrealized Temporary Loss	$ 4,400