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Stockholders' Equity - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended
Mar. 31, 2020
Dec. 31, 2019
Schedule Of Stockholders Equity [Line Items]    
Preferred stock, shares authorized (in shares) 50,000,000.0 50,000,000.0
Preferred stock par value, per share (USD per share) $ 0.01 $ 0.01
Preferred stock, shares outstanding (in shares) 10,000,000.0 10,000,000.0
Common stock, shares authorized (in shares) 1,950,000,000 1,950,000,000
Common stock, par value (USD per share) $ 0.01 $ 0.01
Common stock, shares issued (in shares) 533,500,000 532,800,000
Common stock purchased (in shares) 109,000,000.0 89,200,000
Number of shares authorized for repurchase (in shares)   20,000,000.0
Treasury stock shares acquired (in shares) 19,800,000  
Treasury stock acquired $ 304.4  
People's United Financial, Inc.    
Schedule Of Stockholders Equity [Line Items]    
Preferred stock, shares authorized (in shares) 50,000,000.0 50,000,000.0
Preferred stock par value, per share (USD per share) $ 0.01 $ 0.01
Preferred stock, shares outstanding (in shares) 10,000,000.0 10,000,000.0
Common stock, shares authorized (in shares) 1,950,000,000 1,950,000,000
Common stock, par value (USD per share) $ 0.01 $ 0.01
Common stock, shares issued (in shares) 533,500,000 532,800,000
Repurchases Authorized by Board of Directors    
Schedule Of Stockholders Equity [Line Items]    
Common stock purchased (in shares) 106,400,000 86,600,000
2007 Recognition and Retention Plan    
Schedule Of Stockholders Equity [Line Items]    
Common stock purchased (in shares) 2,600,000  
2014 Long-Term Incentive Plan | 2007 Recognition and Retention Plan    
Schedule Of Stockholders Equity [Line Items]    
Additional awards under RRP (in shares) 0