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Subsequent Events (Details)
$ / shares in Units, $ in Millions
3 Months Ended
Nov. 01, 2023
$ / shares
shares
Oct. 20, 2023
USD ($)
Oct. 02, 2023
USD ($)
Dec. 31, 2023
USD ($)
Sep. 30, 2023
USD ($)
Dec. 31, 2022
USD ($)
Subsequent Event [Line Items]            
Commitments         $ 290,371 $ 277,172
Signature Bridge Bank N.A Capital Commitment            
Subsequent Event [Line Items]            
Commitments         $ 16,000  
Subsequent Event            
Subsequent Event [Line Items]            
Funded loans     $ 9,000      
Depository shares redeemed (in shares) | shares 1,000,000,000          
Subsequent Event | Forecast            
Subsequent Event [Line Items]            
Workforce reduction percentage       4.00%    
One-time expenses       $ 150    
Subsequent Event | Signature Bridge Bank N.A Capital Commitment            
Subsequent Event [Line Items]            
Commitments     $ 16,000      
Subsequent Event | 2027 Senior Notes | Senior debt            
Subsequent Event [Line Items]            
Debt instrument, face amount   $ 1,250        
Interest rate   6.615%        
Subsequent Event | 2027 Senior Notes | Senior debt | Secured Overnight Financing Rate (SOFR)            
Subsequent Event [Line Items]            
Debt instrument, basis spread on variable rate   1.73%        
Subsequent Event | 2034 Senior Notes | Senior debt            
Subsequent Event [Line Items]            
Debt instrument, face amount   $ 2,250        
Interest rate   6.875%        
Subsequent Event | 2034 Senior Notes | Senior debt | Secured Overnight Financing Rate (SOFR)            
Subsequent Event [Line Items]            
Debt instrument, basis spread on variable rate   2.284%        
Subsequent Event | Series O            
Subsequent Event [Line Items]            
Depository shares redeemed (in shares) | shares 1,000,000,000,000          
Preferred stock, redemption price per share (in dollars per share) | $ / shares $ 1,000          
Depositary shares conversion ratio 0.01