Investments (Rollforward of expected credit losses Private Debt HFI) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Private Debt, Held-for-investment, Allowance for Credit Loss [Line Items]
Private Debt Held-for-investment, Allowance for Credit Loss, Beginning Balance	$ 3	$ 5	$ 4	$ 4
Private Debt Held-for-investment, Allowance for Credit Loss, Period Increase (Decrease)	0	1	0	2
Private Debt Held-for-investment, Allowance for Credit Loss, Recovery	0	(1)	(1)	(1)
Private Debt Held-for-investment, Allowance for Credit Loss, Ending Balance	$ 3	$ 5	$ 3	$ 5