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Acquisition and Divestitures - Additional Information (Details) - USD ($)
 9 Months Ended 12 Months Ended
Apr. 29, 2023
Apr. 01, 2022
Dec. 31, 2022
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Oct. 31, 2022
Dec. 31, 2021
Business Acquisition [Line Items]                
Allowance for credit losses at acquisition   $ 99,000,000            
ACL for non-PCD loan and leases   242,000,000            
Net income (loss)       $ 2,588,000,000 $ 2,741,000,000 $ 1,992,000,000    
Total assets of partnerships in which the company invested       208,105,000,000 208,264,000,000      
Shareholders’ equity     $ 25,318,000,000 29,027,000,000 26,957,000,000 25,318,000,000   $ 17,903,000,000
PCD Acquired Loans                
Business Acquisition [Line Items]                
Allowance for credit loss, write-off   33,000,000            
Collective Investment Trust | Trust income                
Business Acquisition [Line Items]                
Gain (loss) on sale of subsidiary, pre-tax $ 225,000,000              
Gain (loss) on sale of subsidiary after-tax $ 157,000,000              
Revenue from contract with customer         60,000,000 165,000,000    
Common Stock                
Business Acquisition [Line Items]                
Shareholders’ equity     90,000,000 90,000,000 $ 90,000,000 90,000,000   $ 80,000,000
Peoples United Financial Inc                
Business Acquisition [Line Items]                
Consideration transferred   $ 8,393,000,000            
Price per share at acquisition date (in US dollars per share)   $ 164.66            
Number of shares issued (in shares)   50,325,004            
ACL for non-PCD loan and leases   $ 242,000,000            
Total revenue     1,600,000,000          
Net income (loss)     $ 165,000,000          
Peoples United Financial Inc | Investment Banking, Legal and Other Services                
Business Acquisition [Line Items]                
Merger-related expenses       $ 0        
MT                
Business Acquisition [Line Items]                
Common stock portion, number of First Bancorp's stock for each share of acquiree common stock converted (in shares)   0.118            
M&T Insurance Agency, Inc                
Business Acquisition [Line Items]                
Total revenue           34,000,000    
Gain (loss) on sale of subsidiary, pre-tax           136,000,000    
Gain (loss) on sale of subsidiary after-tax           $ 98,000,000    
Total assets of partnerships in which the company invested             $ 18,000,000  
Shareholders’ equity             $ 6,000,000