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Loans, Allowance for Loan Losses and Allowance for Unfunded Credit Commitments - Summary of Loans Modified in Troubled Debt Restructurings (TDRs) (Details)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2021
USD ($)
Jun. 30, 2020
USD ($)
Jun. 30, 2021
USD ($)
troubled_debt_restructuring
Jun. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
Financing Receivable, Troubled Debt Restructuring [Line Items]          
Number of TDRs | troubled_debt_restructuring     12    
Loans modified in TDRs $ 61   $ 61   $ 61
Unfunded commitments available for funding associated with TDRs 0   0    
Partial charge-offs on loans classified as TDRs 6 $ 5 7 $ 18  
Investor dependent          
Financing Receivable, Troubled Debt Restructuring [Line Items]          
Loans modified in TDRs 21   21   36
Investor dependent | Early stage          
Financing Receivable, Troubled Debt Restructuring [Line Items]          
Loans modified in TDRs 1   1   7
Investor dependent | Mid stage          
Financing Receivable, Troubled Debt Restructuring [Line Items]          
Loans modified in TDRs 5   5   4
Investor dependent | Later stage          
Financing Receivable, Troubled Debt Restructuring [Line Items]          
Loans modified in TDRs 15   15   25
Cash flow dependent          
Financing Receivable, Troubled Debt Restructuring [Line Items]          
Loans modified in TDRs 35   35   23
Cash flow dependent | Sponsor led buyout          
Financing Receivable, Troubled Debt Restructuring [Line Items]          
Loans modified in TDRs 34   34   22
Cash flow dependent | Other          
Financing Receivable, Troubled Debt Restructuring [Line Items]          
Loans modified in TDRs 1   1   1
Private bank          
Financing Receivable, Troubled Debt Restructuring [Line Items]          
Loans modified in TDRs 3   3   0
Premium wine          
Financing Receivable, Troubled Debt Restructuring [Line Items]          
Loans modified in TDRs $ 2   $ 2   $ 2