Asset Management Fees - Asset Management Fees (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Disaggregation of Revenue [Line Items]
Asset management fees	$ 0	$ 53	$ 93
Asset management fees
Disaggregation of Revenue [Line Items]
Asset management fees	0	21	53
Performance fees
Disaggregation of Revenue [Line Items]
Asset management fees	0	18	19
Reimbursable fund expenses
Disaggregation of Revenue [Line Items]
Asset management fees	$ 0	$ 14	$ 21