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Acquisition and Divestiture - Additional Information (Details) - USD ($)
3 Months Ended 6 Months Ended
Apr. 29, 2023
Apr. 01, 2022
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Mar. 31, 2023
Dec. 31, 2022
Mar. 31, 2022
Dec. 31, 2021
Business Acquisition [Line Items]                    
Carrying Value     $ 2,010,600,000   $ 2,010,600,000     $ 2,010,600,000    
Goodwill     8,465,089,000   8,465,089,000     8,490,089,000    
ACL for non-PCD loan and leases   $ 242,000,000                
Initial estimate of expected credit losses   99,000,000                
Assets     207,671,729,000   207,671,729,000     200,729,841,000    
Shareholders' equity     25,800,933,000 $ 25,794,531,000 25,800,933,000 $ 25,794,531,000 $ 25,377,171,000 25,317,990,000 $ 17,876,020,000 $ 17,903,405,000
Net Income (Loss)     867,034,000 217,522,000 1,568,658,000 579,696,000        
Fiduciary and Trust [Member]                    
Business Acquisition [Line Items]                    
Revenue from contract with customer     172,463,000 190,084,000 366,265,000 359,297,000        
Collective Investment Trust [Member] | Fiduciary and Trust [Member]                    
Business Acquisition [Line Items]                    
Gain (loss) on sale of subsidiary, pre-tax $ 225,000,000                  
Revenue from contract with customer     15,000,000 40,000,000 60,000,000 81,000,000        
Common Stock [Member]                    
Business Acquisition [Line Items]                    
Shareholders' equity     89,718,000 89,718,000 $ 89,718,000 89,718,000 $ 89,718,000 $ 89,718,000 $ 79,871,000 $ 79,871,000
Peoples United Financial Inc [Member]                    
Business Acquisition [Line Items]                    
Business combination, market value   $ 8,400,000,000                
Common stock, price per share   $ 164.66                
Assets   $ 60,244,818,000                
Goodwill   3,908,245,000                
Core deposits and other intangible assets   $ 261,000,000                
Peoples United Financial Inc [Member] | Investment Banking, Legal and Other Services [Member]                    
Business Acquisition [Line Items]                    
Merger-related expenses     $ 0 $ 223,000,000   $ 240,000,000        
Peoples United Financial Inc [Member] | Core Deposit and Other Intangible Assets [Member] | Minimum [Member]                    
Business Acquisition [Line Items]                    
Amortization period   3 years                
Peoples United Financial Inc [Member] | Core Deposit and Other Intangible Assets [Member] | Maximum [Member]                    
Business Acquisition [Line Items]                    
Amortization period   7 years                
Peoples United Financial Inc [Member] | Common Stock [Member]                    
Business Acquisition [Line Items]                    
Common stock issued in transaction   50,325,004                
MT [Member]                    
Business Acquisition [Line Items]                    
Common stock, price per share   $ 0.118