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Stock-Based Compensation (Stock-Based Compensation - Additional Information) (Detail) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Employee Stock Ownership Plan (ESOP) Disclosures      
The Bancorp's total overhang (potential dilution from share-based compensation) 9.00%    
SARs, RSAs, RSUs, stock options and PSAs outstanding as a percentage of issued shares 7.00%    
Annual return on tangible common equity performance hurdle 2.00%    
Stock-based compensation expense $ 111 $ 100 $ 83
Income tax benefit related to stock-based compensation expense $ 39 $ 36 $ 30
2014 Incentive Compensation Plan      
Employee Stock Ownership Plan (ESOP) Disclosures      
Stock authorized for issuance     36,000,000
2014 Incentive Compensation Plan | Shares For Full Value Awards      
Employee Stock Ownership Plan (ESOP) Disclosures      
Stock authorized for issuance     16,000,000
Stock Appreciation Rights Granted      
Employee Stock Ownership Plan (ESOP) Disclosures      
Vesting period of share based compensation ratably over a four year period of continued employment    
Weighted-average grant-date fair value per share $ 5.16 $ 5.52 $ 6.53
Shares granted 6,379,000 5,219,000 4,526,000
Stock Appreciation Rights Vested      
Employee Stock Ownership Plan (ESOP) Disclosures      
Total grant-date fair value $ 32 $ 35 $ 34
Stock Appreciation Rights Outstanding      
Employee Stock Ownership Plan (ESOP) Disclosures      
Stock-based compensation expense $ 40    
Weighted-average period over which expense is expected to be recognized 2 years 4 months 24 days    
Restricted Stock Awards      
Employee Stock Ownership Plan (ESOP) Disclosures      
Vesting period of share based compensation after three or four years or ratably over three or four years of continued employment.    
Stock-based compensation expense $ 52    
Total grant-date fair value $ 55 $ 43 $ 32
Weighted-average period over which expense is expected to be recognized 2 years    
Shares granted 3,000 4,250,000 3,264,000
Restricted Stock Units      
Employee Stock Ownership Plan (ESOP) Disclosures      
Vesting period of share based compensation after three or four years or ratably over three or four years of continued employment.    
Stock-based compensation expense $ 57    
Total grant-date fair value $ 2 $ 2  
Weighted-average period over which expense is expected to be recognized 2 years 10 months 24 days    
Shares granted 5,029,000 377,000  
Stock options      
Employee Stock Ownership Plan (ESOP) Disclosures      
Intrinsic value of stock options exercised   $ 1 $ 1
Cash received from stock options exercised $ 1 $ 2 $ 1
Stock options vested 0 0 0
Performance Share Awards      
Employee Stock Ownership Plan (ESOP) Disclosures      
Vesting period of share based compensation three year cliff vesting terms    
Weighted-average grant-date fair value per share $ 14.87 $ 19.48 $ 15.61
Shares granted 583,608 458,355 322,567
Employee stock purchase plan      
Employee Stock Ownership Plan (ESOP) Disclosures      
Stock-based compensation expense $ 1 $ 1 $ 1
Match on qualifying employees purchase of shares of the Bancorp's common stock 15.00%    
Stock purchased by plan participants 684,885 617,829 599,101