Accrued Expenses and Other Liabilities (Details) - USD ($) $ in Millions	Mar. 31, 2025	Dec. 31, 2024	Mar. 31, 2024	Dec. 31, 2023
Accounts Payable and Accrued Liabilities [Abstract]
Accounts payable	$ 1,166	$ 505
Unfunded commitments for proportional amortization investments	1,022	1,019
Reserves for insurance losses and loss adjustment expenses	268	189	$ 164	$ 140
Employee compensation and benefits	232	424
Deferred revenue	125	122
Operating lease liabilities	106	111
Other liabilities	396	444
Total accrued expenses and other liabilities	$ 3,315	$ 2,814