Investments (Net Investment Income) (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income	$ 6,169	$ 5,587	$ 12,194	$ 11,064
Less: investment expense	(386)	(361)	(746)	(708)
Net investment income	5,783	5,226	11,448	10,356
Assets supporting experience-rated contractholder liabilities
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income	13	14	28	28
Equity securities
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income	97	49	162	93
Commercial mortgage and other loans
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income	771	691	1,511	1,383
Policy loans
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income	121	123	243	247
Other invested assets
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income	463	418	914	814
Short-term investments and cash equivalents
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income	213	230	445	497
Available-for-sale \| Fixed maturities
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income	4,290	3,885	8,474	7,658
Trading \| Fixed maturities
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income	$ 201	$ 177	$ 417	$ 344

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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