Loans and Allowance for Credit Losses - Activity in the Allowance for Credit Losses for Loans Held for Investment (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	$ 122
Provision (reversal) for credit loss	33
Ending balance	87	$ 122
Leveraged Loans
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	97	61
Charge-offs	(2)	(41)
Provision (reversal) for credit loss	(29)	70
Other	5	(7)
Ending balance	61	97
Other Loans
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	17	10
Charge-offs	0	0
Provision (reversal) for credit loss	(6)	7
Other	(1)	0
Ending balance	12	17
Other Loans | Fund Finance
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	13
Ending balance	11	13
Other Loans | Other Loans
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	4
Ending balance	1	4
Commercial Real Estate
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	8	2
Charge-offs	0	0
Provision (reversal) for credit loss	6	6
Other	0	0
Ending balance	14	8
Available-for-sale securities
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	0
Charge-offs	0
Provision (reversal) for credit loss	2
Other	0
Ending balance	2	0
Held-to-Maturity Securities
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	3	0
Charge-offs	0	0
Provision (reversal) for credit loss	3	3
Other	0	0
Ending balance	0	3
Off-Balance Sheet Commitments
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	22	19
Charge-offs	0	0
Provision (reversal) for credit loss	(2)	2
Other	1	(1)
Ending balance	19	22
All Other
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	1	1
Charge-offs	0	0
Provision (reversal) for credit loss	(1)	0
Other	0	0
Ending balance	0	1
Total Credit Reserve
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	148	93
Charge-offs	(2)	(41)
Provision (reversal) for credit loss	(33)	88
Other	5	(8)
Ending balance	$ 108	$ 148