Investments (Fixed Maturity Securities - Narrative) (Details) $ in Millions	3 Months Ended
	Mar. 31, 2023 USD ($)	Mar. 31, 2022 USD ($)	Dec. 31, 2022 USD ($)
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, estimated fair value	$ 76,852		$ 74,757
Fixed maturity securities, allowance for credit losses	$ 4		6
Fixed maturity securities with allowance for credit losses, number of securities	13
Fixed maturity securities, total write-offs	$ 7	$ 2
Non-Income Producing
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, estimated fair value	13		0
Fixed maturity securities
Debt Securities, Available-for-sale [Line Items]
Accrued interest receivable	$ 649		$ 595