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Acquisition and Divestitures - Summary of Acquisition, Pro Forma Information (Details) - Peoples United Financial Inc [Member] - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total revenues $ 8,631 $ 8,076
Net income $ 2,158 $ 2,391