Investments (Allowance for credit loss activity) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest [Roll Forward]
Write-offs charged against the allowance	$ (25)
Mortgage loans
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest [Roll Forward]
Allowance for credit losses, beginning balance	35	$ 35
Current-period provision for expected credit losses	5	0
Write-offs charged against the allowance	(25)	0
Allowance for credit loss, ending balance	$ 15	$ 35