Investments (Net Investment Income) (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income	$ 19,066	$ 16,887	$ 18,946
Less: investment expenses	(1,201)	(850)	(659)
Net investment income	17,865	16,037	18,287
Assets supporting experience-rated contractholder liabilities
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income	45	167	601
Equity securities
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income	197	160	162
Commercial mortgage and other loans
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income	2,279	2,196	2,552
Policy loans
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income	499	499	533
Other invested assets
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income	1,347	1,240	2,617
Short-term investments and cash equivalents
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income	954	406	63
Available-for-sale \| Fixed maturities
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income	13,305	11,773	11,999
Held-to-maturity \| Fixed maturities
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income	148	213	226
Trading \| Fixed maturities
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income	$ 292	$ 233	$ 193

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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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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