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Stock-Based Compensation - Narrative (Details) - shares
shares in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Stock-Based Compensation Details [Line Items]        
Number of shares available for grant (shares) 8 11    
Restricted Stock Units (RSUs) | 2018 - 2020 Awards | Graded vesting after year one of service period        
Stock-Based Compensation Details [Line Items]        
Share-based compensation arrangement by share-based payment award, award vesting rights (percent) 25.00%      
Performance period 1 year      
Restricted Stock Units (RSUs) | 2018 - 2020 Awards | Graded vesting after year two of service period        
Stock-Based Compensation Details [Line Items]        
Share-based compensation arrangement by share-based payment award, award vesting rights (percent) 25.00%      
Performance period 2 years      
Restricted Stock Units (RSUs) | 2018 - 2020 Awards | Graded vesting after year three of service period        
Stock-Based Compensation Details [Line Items]        
Share-based compensation arrangement by share-based payment award, award vesting rights (percent) 50.00%      
Performance period 3 years      
Restricted Stock Units (RSUs) | Prior to 2018 Awards        
Stock-Based Compensation Details [Line Items]        
Performance period       3 years
Restricted Stock Units (RSUs) | 2021 Awards | Graded vesting after year one of service period        
Stock-Based Compensation Details [Line Items]        
Share-based compensation arrangement by share-based payment award, award vesting rights (percent) 33.00%      
Performance period 1 year      
Restricted Stock Units (RSUs) | 2021 Awards | Graded vesting after year two of service period        
Stock-Based Compensation Details [Line Items]        
Share-based compensation arrangement by share-based payment award, award vesting rights (percent) 33.00%      
Performance period 2 years      
Restricted Stock Units (RSUs) | 2021 Awards | Graded vesting after year three of service period        
Stock-Based Compensation Details [Line Items]        
Share-based compensation arrangement by share-based payment award, award vesting rights (percent) 34.00%      
Performance period 3 years      
Performance Shares        
Stock-Based Compensation Details [Line Items]        
Performance period 3 years 2 years 2 years 1 year
Approximation of grant date fair value   50.00%    
Performance Shares | Revenue        
Stock-Based Compensation Details [Line Items]        
Weighting of measurement components (percent) 25.00%      
Performance Shares | Free Cash Flow        
Stock-Based Compensation Details [Line Items]        
Weighting of measurement components (percent) 25.00%      
Performance Shares | Absolute Share Price        
Stock-Based Compensation Details [Line Items]        
Weighting of measurement components (percent) 50.00%      
Performance Shares | Performance-Based        
Stock-Based Compensation Details [Line Items]        
Performance share maximum overachievement 100.00%      
Performance Shares | Performance Based - Actual Results        
Stock-Based Compensation Details [Line Items]        
Performance-based metric performance period (years) 3 years      
Performance Shares | TSR        
Stock-Based Compensation Details [Line Items]        
Performance period 3 years 3 years 3 years 3 years
Total number of trading days of performance period 20 days     3 years
Performance Shares | Minimum        
Stock-Based Compensation Details [Line Items]        
Performance shares entitlement of original award grant (percent) 0.00%      
Performance Shares | Maximum        
Stock-Based Compensation Details [Line Items]        
Performance shares entitlement of original award grant (percent) 200.00%      
Stock options | Graded vesting after year one of service period        
Stock-Based Compensation Details [Line Items]        
Share-based compensation arrangement by share-based payment award, award vesting rights (percent)       25.00%
Performance period       1 year
Stock options | Graded vesting after year two of service period        
Stock-Based Compensation Details [Line Items]        
Share-based compensation arrangement by share-based payment award, award vesting rights (percent)       25.00%
Performance period       2 years
Stock options | Graded vesting after year three of service period        
Stock-Based Compensation Details [Line Items]        
Share-based compensation arrangement by share-based payment award, award vesting rights (percent)       50.00%
Performance period       3 years
Options outstanding, term (years)       10 years