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Investments (excluding Consolidated Investment Entities) - Narrative (Details) - USD ($)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025	Dec. 31, 2025
Financing Receivable, Nonaccrual [Line Items]
Single issuer in excess of total equity	$ 0		$ 0
Intent impairments	14,000,000	$ 0	$ 18,000,000	$ 19,000,000
Targeted maximum amount of mortgage loans lended, percent of estimated fair value of underlying real estate			75.00%
Loans on non-accrual status	$ 57,000,000		$ 57,000,000		$ 1,000,000
Nonaccrual, interest income			$ 0		$ 0
Investment, Type [Extensible Enumeration]	Fixed maturities		Fixed maturities		Fixed maturities
Private placement debt
Financing Receivable, Nonaccrual [Line Items]
Threshold period past due, nonaccrual	90 days		90 days
Loans on non-accrual status	$ 13,000,000		$ 13,000,000		$ 71,000,000
Minimum
Financing Receivable, Nonaccrual [Line Items]
Fixed maturities average duration	6 years		6 years
Maximum
Financing Receivable, Nonaccrual [Line Items]
Fixed maturities average duration	6 years 6 months		6 years 6 months