Investments (Net Investment Income) (Details) - USD ($) $ in Millions	12 Months Ended
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	5,515	6,111	5,510
Fixed maturity 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
Available-for-sale 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
Cash and 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

Amount, before investment expense, of income earned from investments in securities and real estate. Includes, but is not limited to, real estate investment, policy loans, dividends, and interest. Excludes realized gain (loss) on investments.

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