Investments - Past due commercial mortgage loans (Details) - USD ($) $ in Millions	6 Months Ended	12 Months Ended
Jun. 30, 2025	Dec. 31, 2024
Financing Receivable, Past Due [Line Items]
Financing Receivable, Excluding Accrued Interest, Nonaccrual	$ 0	$ 24
Financing Receivable, Nonaccrual, Interest Income	$ 0	0
Commercial Portfolio Segment
Financing Receivable, Past Due [Line Items]
Financing Receivable, Threshold Past Due, Nonaccrual	90 days
Current \| Commercial Portfolio Segment
Financing Receivable, Past Due [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	$ 4,504	3,608
30 to 59 Days Past Due \| Commercial Portfolio Segment
Financing Receivable, Past Due [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	0	0
60 to 89 Days Past Due \| Commercial Portfolio Segment
Financing Receivable, Past Due [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	0	0
Greater than 90 Days Past Due \| Commercial Portfolio Segment
Financing Receivable, Past Due [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	0	24
Total Segment \| Commercial Portfolio Segment
Financing Receivable, Past Due [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	$ 4,504	$ 3,632

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

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