Quarterly report pursuant to Section 13 or 15(d)

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

v3.19.1
Stock-Based Compensation (Incentive Equity Awards Activity) (Details)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended
Mar. 31, 2019
USD ($)
$ / shares
shares
Weighted Average Grant Price  
Ending balance (in dollars per share) $ 10.46
Options  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options | $ $ 10
Weighted Average Grant Price  
Ending balance (in dollars per share) $ 64.46
Number of Options  
Beginning balance (in shares) | shares 0.5
Granted (in shares) | shares 0.5
Ending balance (in shares) | shares 1.0
Weighted Average Grant Price  
Beginning balance (in dollars per share) $ 61.40
Granted (in dollars per share) 52.44
Ending balance (in dollars per share) $ 56.90
Compensation expense not yet recognized, weighted average period 3 years 7 months
RSUs  
Number of RSUs  
Beginning balance (in shares) | shares 0.5
Granted (in shares) | shares 0.5
Ending balance (in shares) | shares 1.0
Weighted Average Grant Price  
Beginning balance (in dollars per share) $ 61.31
Granted (in dollars per share) 52.44
Ending balance (in dollars per share) $ 50.03
Weighted Average Grant Price  
Aggregate unrecognized compensation expense | $ $ 60
Compensation expense not yet recognized, weighted average period 3 years 6 months
Performance Shares  
Number of RSUs  
Beginning balance (in shares) | shares 0.0
Granted (in shares) | shares 0.1
Weighted Average Grant Price  
Beginning balance (in dollars per share) $ 0.00
Granted (in dollars per share) 52.44
Ending balance (in dollars per share) $ 52.44
Number of Options  
Ending balance (in shares) | shares 0.1
Weighted Average Grant Price  
Aggregate unrecognized compensation expense | $ $ 5
Compensation expense not yet recognized, weighted average period 2 years 11 months
RSUs, Granted Prior to 2018  
Weighted Average Grant Price  
Aggregate unrecognized compensation expense | $ $ 2