XML 111 R101.htm IDEA: XBRL DOCUMENT v3.23.3
Borrowings - Narrative (Details) - USD ($)
Sep. 30, 2023
Dec. 31, 2022
Debt Instrument [Line Items]    
Securities sold under customer repurchase agreements $ 453,000,000 $ 436,000,000
Debt instrument, collateral amount 30,700,000,000  
Asset Pledged as Collateral | Securities Assets    
Debt Instrument [Line Items]    
Securities sold under customer repurchase agreements 470,000,000 496,000,000
Unsecured Debt    
Debt Instrument [Line Items]    
Line of credit facility, maximum borrowing capacity 100,000,000  
Notes Payable To FHLB | Secured Debt | Asset Pledged as Collateral    
Debt Instrument [Line Items]    
Debt instrument, collateral amount 24,500,000,000  
Other secured financings | Secured Debt | Federal Reserve Bank of Richmond    
Debt Instrument [Line Items]    
Debt instrument, collateral amount 6,200,000,000  
Line of credit facility, additional borrowing capacity 5,000,000,000  
Long-term line of credit $ 0 $ 0