Investments (excluding Consolidated Investment Entities) - Past due commercial mortgage loans (Details) - USD ($)	12 Months Ended
Dec. 31, 2024	Dec. 31, 2023
Financing Receivable, Past Due [Line Items]
Investments in fixed maturities that did not produce net investment income	$ 26,000,000	$ 16,000,000
Financing receivable, nonaccrual, interest income	$ 0	0
Commercial Portfolio Segment
Financing Receivable, Past Due [Line Items]
Threshold period past due, nonaccrual	90 days
Commercial Portfolio Segment \| Current
Financing Receivable, Past Due [Line Items]
Commercial mortgage loans	$ 4,673,000,000	5,202,000,000
Commercial Portfolio Segment \| 30 to 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Commercial mortgage loans	0	0
Commercial Portfolio Segment \| 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Commercial mortgage loans	0	0
Commercial Portfolio Segment \| Greater than 90 Days Past Due
Financing Receivable, Past Due [Line Items]
Commercial mortgage loans	26,000,000	16,000,000
Commercial Portfolio Segment \| Total Segment
Financing Receivable, Past Due [Line Items]
Commercial mortgage loans	$ 4,699,000,000	$ 5,218,000,000

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

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