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Related Party Transactions (Related Party Transactions - Additional Information) (Detail)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended
Jun. 30, 2018
USD ($)
$ / shares
shares
Mar. 31, 2018
USD ($)
Oct. 31, 2018
Sep. 30, 2018
USD ($)
$ / shares
Dec. 31, 2017
USD ($)
$ / shares
Related Party Transactions          
Equity securities       $ 500 $ 439
Common stock, stated value | $ / shares       $ 2.22 $ 2.22
Worldpay Holding, LLC          
Related Party Transactions          
Equity method investments, carrying value       $ 424  
Equity Method Investment Ownership Percentage   4.90%   3.30% 8.60%
Worldpay, Inc.          
Related Party Transactions          
Membership Units     10,300,000    
Common stock sold | shares 5        
Worldpay, Inc. | Other Noninterest Income          
Related Party Transactions          
Recognized gain $ 205 $ 414      
GS Holdings          
Related Party Transactions          
Equity securities       $ 45  
Equity Method Investment Ownership Percentage 1.40%        
Membership Units 2,525,498        
GreenSky, LLC          
Related Party Transactions          
Membership Units 252,550        
GreenSky, LLC | Other Noninterest Income          
Related Party Transactions          
Recognized gain $ 16        
GreenSky, Inc          
Related Party Transactions          
Common stock issued | shares 38        
Common stock, stated value | $ / shares $ 23