Investments (Net Investment Income) (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2026	Mar. 31, 2025
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income	$ 6,025	$ 5,477
Less: investment expense	(360)	(347)
Net investment income	5,665	5,130
Assets supporting experience-rated contractholder liabilities
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income	15	14
Equity securities
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income	65	44
Commercial mortgage and other loans
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income	740	692
Policy loans
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income	122	124
Other invested assets
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income	451	396
Short-term investments and cash equivalents
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income	232	267
Available-for-sale \| Fixed maturities
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income	4,184	3,773
Trading \| Fixed maturities
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income	$ 216	$ 167

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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