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, 2022	Mar. 31, 2021
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	$ 87
Provision		$ (9)
Ending balance	86
Leveraged Loans
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	61	97
Charge-offs	(1)	0
Provision	1	(1)
Foreign currency translation		(4)
Ending balance	61	92
Other Loans
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	12	17
Charge-offs	0	0
Provision	(1)	(5)
Foreign currency translation		0
Ending balance	11	12
Other Loans | Fund Finance
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Ending balance	10	10
Other Loans | Other Loans
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Ending balance	1	2
Commercial Real Estate
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	14	8
Charge-offs	0	0
Provision	0	6
Foreign currency translation		0
Ending balance	14	14
Available-for-sale Securities
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	2
Charge-offs	0
Provision	0
Ending balance	2
Held-to-Maturity Securities
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance		3
Charge-offs		0
Provision		(1)
Foreign currency translation		0
Ending balance		2
Off-Balance Sheet Commitments
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	19	22
Charge-offs	0	0
Provision	0	(7)
Foreign currency translation		0
Ending balance	19	15
All Other
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	0	1
Charge-offs	0	0
Provision	0	(1)
Foreign currency translation		0
Ending balance	0	0
Total
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	108	148
Charge-offs	(1)	0
Provision	0	(9)
Foreign currency translation		(4)
Ending balance	$ 107	$ 135