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	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance		$ 174
Provision for credit losses	$ 59	59	$ 75	$ 46
Ending balance	193	193	174
Held-to-Maturity Securities
Beginning balance		0	1
Provision			(1)
Charge-offs			0
Ending balance			0	1
Off-Balance Sheet Commitments
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance		9	14
Provision for credit losses		(1)	(5)
Charge-offs		0	0
Ending balance	8	8	9	14
All Other
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance		0
Provision for credit losses		2
Charge-offs		0
Ending balance	2	2	0
Total Credit Reserve
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance		183	150
Provision for credit losses		59	75
Charge-offs		(39)	(42)
Ending balance	203	203	183	150
Commercial
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Provision for credit losses		(15)
Other
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance		1
Ending balance			1
Subscription finance and fund finance loans
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Ending balance	2	2
Fund finance
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance		2
Ending balance			2
Commercial and Financial | Commercial
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance		68	72
Provision for credit losses		16	13
Charge-offs		(15)	(17)
Ending balance	69	69	68	72
Commercial and Financial | Other
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance		4	3
Provision for credit losses		1	1
Charge-offs		0	0
Ending balance	5	5	4	3
Commercial Real Estate | Commercial real estate
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance		102	60
Provision for credit losses		41	67
Charge-offs		(24)	(25)
Ending balance	$ 119	$ 119	$ 102	$ 60