Investments (Net Investment Income) (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Net Investment Income [Line Items]
Gross investment income	$ 928	$ 1,302	$ 3,197	$ 3,736
Less: Investment expenses	71	38	161	107
Net investment income	857	1,264	3,036	3,629
Fixed maturity securities
Net Investment Income [Line Items]
Gross investment income	779	706	2,221	2,080
Equity securities
Net Investment Income [Line Items]
Gross investment income	1	0	2	2
Mortgage loans
Net Investment Income [Line Items]
Gross investment income	207	171	614	500
Policy loans
Net Investment Income [Line Items]
Gross investment income	10	10	31	31
Limited partnerships and LLCs
Net Investment Income [Line Items]
Gross investment income	(106)	402	257	1,090
Cash, cash equivalents and short-term investments
Net Investment Income [Line Items]
Gross investment income	17	1	22	3
Other
Net Investment Income [Line Items]
Gross investment income	$ 20	$ 12	$ 50	$ 30

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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Amount, after 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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