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Stockholders' Equity - SAR and Option Activity (Details)
$ / shares in Units, shares in Thousands, $ in Millions
 9 Months Ended 12 Months Ended
Sep. 30, 2021
USD ($)
$ / shares
shares
Dec. 31, 2020
USD ($)
$ / shares
shares
Weighted-Average Exercise Price Per Share    
Weighted-Average Exercise Price Per Share, Outstanding (in dollars per share) | $ / shares $ 12.87  
Weighted-Average Exercise Price Per Share, Awards assumed in connection with an acquisition (in dollars per share) | $ / shares 5.10  
Weighted-Average Exercise Price Per Share, Awards exercised (in dollars per share) | $ / shares 11.82  
Weighted-Average Exercise Price Per Share, Awards canceled and forfeited (in dollars per share) | $ / shares 18.99  
Weighted-Average Exercise Price Per Share, Outstanding (in dollars per share) | $ / shares 11.76 $ 12.87
Weighted-Average Exercise Price Per Share, Vested and expected to vest (in dollars per share) | $ / shares 8.76  
Weighted-Average Exercise Price Per Share, Exercisable (in dollars per share) | $ / shares $ 8.76  
Weighted-Average Remaining Contractual Life (in years)    
Weighted-Average Contractual Life, Outstanding (in years) 4 years 4 months 17 days 4 years 11 months 19 days
Weighted-Average Contractual Life, Vested and expected to vest (in years) 3 years 7 months 6 days  
Weighted-Average Contractual Life, Exercisable (in years) 3 years 7 months 6 days  
Aggregate Intrinsic Value, Outstanding | $ $ 821 $ 1,104
Aggregate Intrinsic Value, Vested and expected to vest | $ 671  
Aggregate Intrinsic Value, Exercisable | $ $ 671  
SARs Outstanding Number of SARs    
SARs Outstanding Number of SARs    
Shares outstanding (in shares) 229  
Assumed in connection with an acquisition (in shares) 0  
Awards exercised (in shares) (58)  
Awards Canceled and Forfeited (in shares) (7)  
Shares outstanding (in shares) 164 229
Vested and expected to vest (in shares) 135  
Exercisable (in shares) 135  
Stock options    
Options Outstanding Number of Shares    
Options outstanding (in shares) 28,734  
Assumed in connection with an acquisition (in shares) 4,314  
Awards exercised (in shares) (7,954)  
Awards canceled and forfeited (in shares) (400)  
Options outstanding (in shares) 24,694 28,734
Vested and expected to vest (in shares) 18,008  
Exercisable (in shares) 18,008