Loans and Allowance for Credit Losses - Activity in the Allowance for Credit Losses for Loans Held for Investment (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	$ 193
Provision	16	$ 12
Ending balance	168
Total
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	203	183
Provision	16	12
Charge-offs	(40)	(9)
Ending balance	179	186
Commercial Loans
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	69	68
Provision	10	6
Charge-offs	(40)	(9)
Ending balance	39	65
Other Loans
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	5	4
Provision	6	2
Charge-offs	0	0
Ending balance	11	6
Other Loans | Fund Finance
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Ending balance	4	2
Other Loans | Other Loans
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Ending balance	3	1
Commercial Real Estate
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	119	102
Provision	(1)	3
Charge-offs	0	0
Ending balance	118	105
Off-Balance Sheet Commitments
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	8	9
Provision	1	1
Charge-offs	0	0
Ending balance	9	$ 10
All Other
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	2
Provision	0
Charge-offs	0
Ending balance	$ 2