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Undiscounted and Discounted Future Benefit Payments and Gross Premiums (Details) - Life policy reserves: - USD ($) $ in Millions	Sep. 30, 2025	Jun. 30, 2025	Dec. 31, 2024	Sep. 30, 2024	Jun. 30, 2024	Dec. 31, 2023
Term Life Insurance
Liability for Future Policy Benefit, Activity [Line Items]
Undiscounted expected future benefit payments	$ 4,996			$ 4,840
Undiscounted expected future gross premiums	4,675			4,524
Discounted expected future benefit payments	2,792	$ 2,720	$ 2,668	2,794	$ 2,634	$ 2,751
Discounted expected future gross premiums	2,764			2,736
Whole Life Insurance
Liability for Future Policy Benefit, Activity [Line Items]
Undiscounted expected future benefit payments	1,729			1,702
Undiscounted expected future gross premiums	698			687
Discounted expected future benefit payments	654	$ 634	$ 623	668	$ 619	$ 657
Discounted expected future gross premiums	$ 427			$ 428

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