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Stock-Based Compensation - Other Stock-Based Compensation (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Apr. 21, 2009
Mar. 28, 2007
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Employee Stock Ownership Plan (ESOP) Disclosures          
Stock-based compensation expense     $ 123 $ 132 $ 127
1993 Stock Purchase Plan          
Employee Stock Ownership Plan (ESOP) Disclosures          
Available for future issuance (in shares)     3,700,000    
Additional share issued 12,000,000 1,500,000      
Performance shares          
Employee Stock Ownership Plan (ESOP) Disclosures          
Award performance period     3 years    
Shares granted     280,026 328,068 279,568
Weighted-average grant-date fair value per share (in usd per share)     $ 29.64 $ 26.72 $ 33.15
Performance shares | Minimum                
Employee Stock Ownership Plan (ESOP) Disclosures          
Stock award granted (in shares)     0    
Performance shares | Maximum          
Employee Stock Ownership Plan (ESOP) Disclosures          
Stock award granted (in shares)     1,000,000    
Employee stock purchase plan          
Employee Stock Ownership Plan (ESOP) Disclosures          
Match on qualifying employees purchase of shares of the Bancorp's common stock (as a percent)     15.00%    
Stock purchased by plan participants (in shares)     883,735 564,061 471,818
Stock-based compensation expense     $ 2