Quarterly report pursuant to Section 13 or 15(d)

Stock-Based Compensation - Narrative (Details)

v3.19.1
Stock-Based Compensation - Narrative (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Stock-based compensation    
Stock-based compensation $ 19 $ 23
Dividend rate 0.00%  
Risk-free rate 0.00%  
Total unrecognized compensation cost related to unvested Awards $ 61  
Weighted average period of recognition related to unvested equity awards (in years) 1 year 9 months 18 days  
Common Class A    
Stock-based compensation    
Shares reserved for future issuance upon exercise of stock options 27,000  
Common Class A | CEO | Performance Shares    
Stock-based compensation    
RSUs granted 191  
RSUs GDFV $ 17.90  
Award vesting period 1 year  
Common Class B    
Stock-based compensation    
Shares reserved for future issuance upon exercise of stock options 1,800  
Options Granted 26  
Common Class B | Chairman    
Stock-based compensation    
Options Granted 26  
Weighted Average GDFV $ 5.84  
Common Class B | Chairman | RSUs    
Stock-based compensation    
RSUs granted 213  
RSUs GDFV $ 17.90  
Common Class B | Chairman | Performance Shares    
Stock-based compensation    
RSUs granted 194  
Award vesting period 1 year