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Other Policyholder Funds and Benefits Payable (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2026	Sep. 30, 2025	Dec. 31, 2025	Dec. 31, 2024
Liabilities for Guarantees on Long-Duration Contracts [Line Items]
Other policyholder funds and benefits payable	$ 602	$ 614	$ 612
Universal Life
Liabilities for Guarantees on Long-Duration Contracts [Line Items]
Other policyholder funds and benefits payable	187	197	$ 196	$ 206
Policyholder Account Balance, Premium Received	9	9
Policyholder Account Balance, Policy Charge	14	14
Policyholder Account Balance, Surrender and Withdrawal	4	4
Policyholder Account Balance, Benefit Payment	7	6
Policyholder Account Balance, Interest Expense	$ 7	$ 6
Policyholder Account Balance, Weighted Average Crediting Rate	4.30%	4.30%
Policyholder Account Balance, Net Amount at Risk	$ 706	$ 775
Policyholder Account Balance, Cash Surrender Value	$ 186	196
Universal Life \| Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range from 0400 to 0499 \| Minimum
Liabilities for Guarantees on Long-Duration Contracts [Line Items]
Policyholder Account Balance, Guaranteed Minimum Credit Rating	4.00%
Universal Life \| Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range from 0400 to 0499 \| Maximum
Liabilities for Guarantees on Long-Duration Contracts [Line Items]
Policyholder Account Balance, Guaranteed Minimum Credit Rating	5.00%
Universal Life \| Policyholder Account Balance, at Guaranteed Minimum Crediting Rate \| Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range from 0400 to 0499
Liabilities for Guarantees on Long-Duration Contracts [Line Items]
Other policyholder funds and benefits payable	$ 186	196
Short-Duration Insurance, Other
Liabilities for Guarantees on Long-Duration Contracts [Line Items]
Other policyholder funds and benefits payable	$ 415	$ 417