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Loans and Allowance for Credit Losses: Loans and Unfunded Credit Commitments - Summary of Loans Modified in Troubled Debt Restructurings (TDRs) (Details)
$ in Millions
3 Months Ended
Mar. 31, 2022
USD ($)
troubled_debt_restructuring
Mar. 31, 2021
USD ($)
Dec. 31, 2021
USD ($)
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Number of TDRs | troubled_debt_restructuring 65    
Loans modified in TDRs $ 92   $ 96
Unfunded commitments available for funding associated with TDRs 2    
Loans modified in TDRs during the period 8 $ 24  
Payment deferrals      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Loans modified in TDRs during the period 6 22  
Extended Maturity      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Loans modified in TDRs during the period 1    
Payment Deferral and Extended Maturity      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Loans modified in TDRs during the period 1    
Investor dependent      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Loans modified in TDRs 5   15
Loans modified in TDRs during the period 1 0  
Investor dependent | Early stage      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Loans modified in TDRs 2   12
Investor dependent | Growth stage      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Loans modified in TDRs 3   3
Loans modified in TDRs during the period 1 0  
Cash flow dependent and innovation C&I (Commercial and Industrial) | Cash flow dependent - SLBO      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Loans modified in TDRs 33   34
Loans modified in TDRs during the period 0 18  
Cash flow dependent and innovation C&I (Commercial and Industrial) | Innovation C&I      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Loans modified in TDRs during the period 0 4  
Private bank      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Loans modified in TDRs 18   12
Loans modified in TDRs during the period 6 2  
CRE      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Loans modified in TDRs 33   33
Other C&I      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Loans modified in TDRs 3   $ 2
Loans modified in TDRs during the period $ 1 $ 0