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Investments - Past due commercial mortgage loans (Details) - USD ($) $ in Millions	6 Months Ended	9 Months Ended
	Jun. 30, 2026	Sep. 30, 2025	Dec. 31, 2025
Financing Receivable, Past Due [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	$ 4,478		$ 4,602
Financing Receivable, Excluding Accrued Interest, Nonaccrual	13		71
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
Financing Receivable, Past Due [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	$ 4,465		4,531
30 to 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	0		0
60 to 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	0		0
Greater than 90 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	$ 13		$ 71