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Acquisition - Additional Information (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended
Apr. 01, 2022
Mar. 31, 2022
Mar. 31, 2021
Subsequent Event [Member] | Common Stock [Member]      
Business Acquisition [Line Items]      
Common stock issued in transaction 50,325,004    
Peoples United Financial Inc [Member]      
Business Acquisition [Line Items]      
Assets   $ 63,000  
Loans   36,300  
Investment securities   11,600  
Deposits     $ 53,000
Liabilities   55,500  
Stockholders' equity   7,500  
Peoples United Financial Inc [Member] | Investment Banking, Legal and Other Services [Member]      
Business Acquisition [Line Items]      
Merger-related expenses   17 $ 10
Peoples United Financial Inc [Member] | Preferred Stock [Member]      
Business Acquisition [Line Items]      
Stockholders' equity   $ 244  
Peoples United Financial Inc [Member] | Subsequent Event [Member]      
Business Acquisition [Line Items]      
Business combination, market value $ 8,400    
Common stock, price per share $ 164.66    
MT [Member] | Subsequent Event [Member]      
Business Acquisition [Line Items]      
Common stock, price per share $ 0.118