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Share-Based Payments - Equity Incentive Plans (Details) - shares
shares in Millions
12 Months Ended
Dec. 31, 2020
Jun. 05, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Common stock available for grant under share-based awards (in shares)   46
Aggregate common stock reserved for issuance under share-based awards (in shares) 20  
Stock Option Plan    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Expiration period of options 10 years  
Stock Option Plan | Minimum    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Vesting period of award 3 years  
Stock Option Plan | Maximum    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Vesting period of award 5 years  
Restricted Stock | Minimum    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Vesting period of award 3 years  
Restricted Stock | Maximum    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Vesting period of award 5 years  
Performance shares    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Vesting percent 125.00%  
Performance shares | Maximum    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Vesting percent 500.00%