Stock Plans and Share-Based Compensation - Stock Option Activity (Details) $ / shares in Units, shares in Thousands, $ in Millions	12 Months Ended
	Dec. 31, 2021 USD ($) $ / shares shares
Stock Options Outstanding
Outstanding at December 31, 2020 (in shares) | shares	12,652
Granted (in shares) | shares	2,005
Forfeited (in shares) | shares	(174)
Exercised (in shares) | shares	(1,971)
Outstanding at December 31, 2021 (in shares) | shares	12,512
Weighted-Average Exercise Price
Outstanding at December 31, 2020 (in dollars per share) | $ / shares	$ 20.29
Granted (in dollars per share) | $ / shares	29.69
Forfeited (in dollars per share) | $ / shares	26.91
Exercised (in dollars per share) | $ / shares	15.76
Outstanding at December 31, 2021 (in dollars per share) | $ / shares	$ 22.42
Outstanding at December 31, 2021, Weighted-average Remaining Contractual Life (in Years)	7 years 2 months 12 days
Outstanding at December 31, 2021, Aggregate Intrinsic Value | $	$ 190
Exercisable at December 31, 2021 (in shares) | shares	6,347
Exercisable at December 31, 2021, Weighted-Average Exercise Price (in dollars per share) | $ / shares	$ 18.16
Exercisable at December 31, 2021, Weighted-Average Remaining Contractual Life (in Years)	6 years 1 month 6 days
Exercisable at December 31, 2021, Aggregate Intrinsic Value | $	$ 123