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Investments (Net Investment Income) (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Investment income									$ 5,723	$ 6,268	$ 5,685
Investment expense									(208)	(157)	(175)
Net investment income	$ 1,411	$ 1,295	$ 1,398	$ 1,411	$ 1,444	$ 1,575	$ 1,583	$ 1,509	5,515	6,111	5,510
Fixed Maturity AFS Securities [Member] \| AFS Securities [Member]
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Investment income									4,469	4,351	4,334
Trading Securities [Member]
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Investment income									182	167	202
Equity Securities [Member]
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Investment income									11	3	3
Mortgage Loans On Real Estate [Member]
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Investment income									689	680	677
Policy loans [Member]
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Investment income									101	115	125
Invested Cash [Member]
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Investment income									13		12
Commercial mortgage loan prepayment and bond makewhole premiums [Member]
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Investment income									105	199	82
Alternative investments [Member]
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Investment income									66	679	197
Consent fees [Member]
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Investment income									8	10	7
Other Investments [Member]
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Investment income									$ 79	$ 64	$ 46