Investments (excluding Consolidated Investment Entities) - Past Due Commercial Mortgage Loans (Details) - USD ($)	6 Months Ended	12 Months Ended
Jun. 30, 2025	Dec. 31, 2024
Financing Receivable, Past Due [Line Items]
Loans on non-accrual status	$ 0	$ 26,000,000
Nonaccrual, interest income	$ 0	0
Private placement debt
Financing Receivable, Past Due [Line Items]
Threshold period past due, nonaccrual	90 days
Private placement debt \| Current
Financing Receivable, Past Due [Line Items]
Commercial mortgage loans	$ 5,531,000,000	4,673,000,000
Private placement debt \| 30-59 days past due
Financing Receivable, Past Due [Line Items]
Commercial mortgage loans	0	0
Private placement debt \| 60-89 days past due
Financing Receivable, Past Due [Line Items]
Commercial mortgage loans	0	0
Private placement debt \| Greater than 90 days past due
Financing Receivable, Past Due [Line Items]
Commercial mortgage loans	0	26,000,000
Private placement debt \| Total
Financing Receivable, Past Due [Line Items]
Commercial mortgage loans	$ 5,531,000,000	$ 4,699,000,000

Amortized cost excluding accrued interest, before allowance for credit loss, of financing receivable. Excludes net investment in lease.

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