Loans, Allowance for Loan Losses and Allowance for Unfunded Credit Commitments - Nonaccrual Loans with No Allowance for Credit Loss (Details) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual Loans	$ 79	$ 104
Nonaccrual Loans with no Allowance for Credit Loss	6	8
Investor dependent
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual Loans	37	51
Nonaccrual Loans with no Allowance for Credit Loss	3	3
Cash flow dependent
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual Loans	35	46
Nonaccrual Loans with no Allowance for Credit Loss	1	1
Private bank
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual Loans	7	6
Nonaccrual Loans with no Allowance for Credit Loss	2	3
Premium wine
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual Loans	0	1
Nonaccrual Loans with no Allowance for Credit Loss	0	1
Early stage | Investor dependent
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual Loans	11	18
Nonaccrual Loans with no Allowance for Credit Loss	3	0
Mid stage | Investor dependent
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual Loans	5	4
Nonaccrual Loans with no Allowance for Credit Loss	0	3
Later stage | Investor dependent
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual Loans	21	29
Nonaccrual Loans with no Allowance for Credit Loss	0	0
Sponsor led buyout | Cash flow dependent
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual Loans	34	40
Nonaccrual Loans with no Allowance for Credit Loss	0	0
Other | Cash flow dependent
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual Loans	1	6
Nonaccrual Loans with no Allowance for Credit Loss	$ 1	$ 1