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Undiscounted and Discounted Future Benefit Payments and Gross Premiums (Details) - Life policy reserves: - USD ($) $ in Millions	Mar. 31, 2025	Dec. 31, 2024	Mar. 31, 2024	Dec. 31, 2023
Term Life Insurance
Liability for Future Policy Benefit, Activity [Line Items]
Undiscounted expected future benefit payments	$ 4,894		$ 4,816
Undiscounted expected future gross premiums	4,561		4,386
Discounted expected future benefit payments	2,703	$ 2,668	2,698	$ 2,751
Discounted expected future gross premiums	2,658		2,601
Whole Life Insurance
Liability for Future Policy Benefit, Activity [Line Items]
Undiscounted expected future benefit payments	1,719		1,660
Undiscounted expected future gross premiums	692		663
Discounted expected future benefit payments	631	$ 623	637	$ 657
Discounted expected future gross premiums	$ 415		$ 402

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