v3.26.1
Goodwill and Other Intangible Assets - Narrative (Details)
$ in Millions
3 Months Ended
Jan. 01, 2026
USD ($)
Dec. 31, 2025
USD ($)
segment
Mar. 31, 2026
segment
Jun. 30, 2026
USD ($)
Goodwill [Line Items]        
Number of reportable segments | segment   1 2  
Number of operating segments | segment   1    
Goodwill $ 1,849 $ 1,849   $ 3,479
Synovus Financial Corp        
Goodwill [Line Items]        
Goodwill 1,630     $ 1,600
Other identifiable intangible assets 1,110      
Synovus Financial Corp | CDI        
Goodwill [Line Items]        
Other identifiable intangible assets $ 848      
Acquired finite-lived intangible assets, useful life 10 years      
Synovus Financial Corp | Wealth Customer Relationships        
Goodwill [Line Items]        
Other identifiable intangible assets $ 262      
Acquired finite-lived intangible assets, useful life 14 years