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Investments - Schedule of Net Investment Income (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Net Investment Income [Line Items]
Investment income, before expense	$ 3,747	$ 3,407	$ 2,792
Investment expense	(298)	(315)	(314)
Net investment income	3,449	3,092	2,478
Fixed income securities
Net Investment Income [Line Items]
Investment income, before expense	2,509	2,298	1,761
Equity securities
Net Investment Income [Line Items]
Investment income, before expense	99	77	75
Mortgage loans
Net Investment Income [Line Items]
Investment income, before expense	41	36	35
Limited partnership interests
Net Investment Income [Line Items]
Investment income, before expense	634	600	499
Short-term investments
Net Investment Income [Line Items]
Investment income, before expense	345	290	253
Other investments
Net Investment Income [Line Items]
Investment income, before expense	$ 119	$ 106	$ 169

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- Definition

Represents the total of interest and dividend income, including any amortization and accretion (as applicable) of discounts and premiums, earned from (1) loans and leases whether held-for-sale or held-in-portfolio; (2) investment securities; (3) federal funds sold; (4) securities purchased under agreements to resell; (5) investments in banker's acceptances, commercial paper, or certificates of deposit; (6) dividend income; or (7) other investments not otherwise specified herein.

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Amount of expenses related to the generation of investment income.

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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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