Annual report pursuant to Section 13 and 15(d)

Stock-Based Compensation (Incentive Equity Awards Activity) (Details)

v3.20.4
Stock-Based Compensation (Incentive Equity Awards Activity) (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Weighted Average Grant Price      
Nonvested (in dollars per share) $ 8.59 $ 10.46 $ 11.72
Number of Options      
Outstanding, beginning balance (in shares) 0.9    
Granted (in shares) 0.6    
Exercised (in shares) 0.0    
Canceled (in shares) (0.1)    
Expired (in shares) 0.0    
Outstanding, ending balance (in shares) 1.4    
Unvested (in shares) 1.0    
Exercisable (in shares) 0.4    
Weighted Average Exercise Price      
Outstanding (in dollars per share) $ 55.57 56.96  
Granted (in dollars per share) 53.40    
Exercised (in dollars per share) 0    
Canceled (in dollars per share) 54.72    
Expired (in dollars per share) 0    
Unvested (in dollars per share) 54.54    
Exercisable (in dollars per share) $ 57.94    
Outstanding, weighted average remaining contractual term 5 years 6 months    
Exercisable, weighted average remaining contractual term 5 years 1 month 6 days    
Outstanding, intrinsic value $ 6    
Unvested, intrinsic value 5    
Exercisable, intrinsic value 1    
Unvested, unrecognized compensation expense $ 7    
RSUs      
Number of RSUs and PSUs      
Beginning balance (in shares) 0.8    
Granted (in shares) 0.6    
Vested/exercised/canceled (in shares) (0.3)    
Canceled (in shares) (0.2)    
Ending balance (in shares) 0.9    
Weighted Average Grant Price      
Nonvested (in dollars per share) $ 54.15 55.75  
Granted (in dollars per share) 53.01    
Vested/exercised/canceled (in dollars per share) 56.07    
Canceled (in dollars per share) $ 54.71    
Compensation expense not yet recognized, weighted average period 2 years 7 months 6 days    
Aggregate unrecognized compensation expense $ 35    
Performance Shares      
Number of RSUs and PSUs      
Beginning balance (in shares) 0.1    
Granted (in shares) 0.1    
Ending balance (in shares) 0.2    
Weighted Average Grant Price      
Nonvested (in dollars per share) $ 52.93 $ 52.44  
Granted (in dollars per share) $ 53.40    
Compensation expense not yet recognized, weighted average period 1 year 8 months 12 days    
Aggregate unrecognized compensation expense $ 9    
Options      
Weighted Average Grant Price      
Compensation expense not yet recognized, weighted average period 2 years 7 months 6 days    
Weighted Average Exercise Price      
Unvested, weighted average remaining contractual term 5 years 8 months 12 days