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Acquisition - Additional Information (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 6 Months Ended
Feb. 22, 2021
Jun. 30, 2021
Mar. 31, 2021
Jun. 30, 2021
Peoples United Financial Inc        
Business Acquisition [Line Items]        
Business combination, market value $ 7,400      
Common stock, price per share   $ 145.31   $ 145.31
Assets   $ 63,300   $ 63,300
Loans   41,400   41,400
Deposits   52,600   52,600
Liabilities   55,600   55,600
Stockholders' equity       $ 7,700
Peoples United Financial Inc | Investment Banking, Legal and Other Services [Member]        
Business Acquisition [Line Items]        
Merger-related expenses   $ 4 $ 10  
MT        
Business Acquisition [Line Items]        
Common stock, price per share $ 0.118