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Summary of Significant Accounting Policies - Additional Information (Details)
12 Months Ended
Dec. 31, 2022
USD ($)
class_financing_receivable
portfolio_segment
Dec. 31, 2021
USD ($)
Significant Accounting Policies [Line Items]    
Interest receivable $ 402,000,000 $ 171,000,000
Number of portfolio segments | portfolio_segment 8  
Number of classes of financing receivables | class_financing_receivable 11  
Financing receivable, allowance for credit loss, forecast period 3 years  
Threshold period past due for nonaccrual loans 90 days  
Finance lease obligations $ 0 0
Commercial loans    
Significant Accounting Policies [Line Items]    
Threshold period past due, writeoff 180 days  
Consumer loans    
Significant Accounting Policies [Line Items]    
Threshold period past due, writeoff 120 days  
Accrued Interest Receivable And Other Assets | Held-to-maturity securities    
Significant Accounting Policies [Line Items]    
Interest receivable $ 211,000,000 $ 225,000,000
Investor dependent    
Significant Accounting Policies [Line Items]    
Number of classes of financing receivables | class_financing_receivable 2  
Cash flow dependent and innovation C&I    
Significant Accounting Policies [Line Items]    
Number of classes of financing receivables | class_financing_receivable 2  
Premium wine and other    
Significant Accounting Policies [Line Items]    
Number of classes of financing receivables | class_financing_receivable 2  
Lower Limit    
Significant Accounting Policies [Line Items]    
Term of contract on forward contracts 1 year  
Lower Limit | Investor dependent | Growth stage | Mid stage    
Significant Accounting Policies [Line Items]    
Risk-based segments, revenue threshold of subcategories $ 5,000,000  
Lower Limit | Investor dependent | Growth stage | Later stage    
Significant Accounting Policies [Line Items]    
Risk-based segments, revenue threshold of subcategories $ 15,000,000  
Lower Limit | Cash flow dependent and innovation C&I | Cash flow dependent - SLBO    
Significant Accounting Policies [Line Items]    
Sponsor equity contribution, percentage of acquisition price 50.00%  
Upper Limit    
Significant Accounting Policies [Line Items]    
Ownership interest percentage 5.00%  
Term of contract on forward contracts 5 years  
Upper Limit | Investor dependent | Early stage    
Significant Accounting Policies [Line Items]    
Risk-based segments, revenue threshold of subcategories $ 5,000,000  
Upper Limit | Investor dependent | Growth stage | Mid stage    
Significant Accounting Policies [Line Items]    
Risk-based segments, revenue threshold of subcategories $ 15,000,000  
Equity warrant assets (public portfolio) | Sales restrictions discount | Upper Limit    
Significant Accounting Policies [Line Items]    
Sales restriction discounts 0.20  
Other equity securities | Lower Limit    
Significant Accounting Policies [Line Items]    
Duration of the sale restrictions 3 months  
Other equity securities | Upper Limit    
Significant Accounting Policies [Line Items]    
Duration of the sale restrictions 6 months  
Other equity securities | Sales restrictions discount | Lower Limit    
Significant Accounting Policies [Line Items]    
Sales restriction discounts 0.10  
Other equity securities | Sales restrictions discount | Upper Limit    
Significant Accounting Policies [Line Items]    
Sales restriction discounts 0.20  
Non-marketable securities | Fair value accounting | Venture capital and private equity fund investments measured at net asset value | Strategic Investors Fund, LP    
Significant Accounting Policies [Line Items]    
Ownership interest percentage 12.60% 12.60%
Non-marketable securities | Fair value accounting | Venture capital and private equity fund investments measured at net asset value | Capital Preferred Return Fund, LP    
Significant Accounting Policies [Line Items]    
Ownership interest percentage 20.00% 20.00%
Non-marketable securities | Fair value accounting | Venture capital and private equity fund investments measured at net asset value | Growth Partners, LP    
Significant Accounting Policies [Line Items]    
Ownership interest percentage 33.00% 33.00%