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Investments - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Investment [Line Items]
Mortgage loans, net	$ 879	$ 784
Fixed income securities	59,115	52,747
Short-term investments	$ 4,887	4,537
Percentage of credit concentration risk of single issuer and affiliates of shareholder's equity (as a percent)	10.00%
Fixed income and equity securities carrying value	$ 1,870	1,950
Interest income on collateral, net of fees	7	3	$ 0
Debt securities below investment grade	4,680	4,570
Fixed income and short-term investments carrying value	202
Non-income producing fixed income securities	1
Accrued investment income	708	615
Residential
Investment [Line Items]
Mortgage loans, net	260	61
Municipal
Investment [Line Items]
Fixed income securities	5,643	8,842
Municipal bonds, tax exempt value	4,650	7,710
Short-term investments		4,540
Fixed income securities
Investment [Line Items]
Fixed income securities	11	16
Accrued investment income	$ 662	$ 574

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