Stock-Based Compensation - Activity, Pricing and Other Information for Stock Options (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020
Number of Options
Outstanding, beginning balance (in shares)	6,372,684
Granted (in shares)	542,153
Exercised (in shares)	(2,319,438)
Lapsed or canceled (in shares)	(7,767)
Outstanding, ending balance (in shares)	4,587,632	6,372,684
Expected to vest (in shares)	1,280,416
Exercisable, ending balance (in shares)	3,223,629
Weighted-Average Exercise Price Per Option
Outstanding, beginning balance (in dollars per share)	$ 14.18
Granted (in dollars per share)	20.98
Exercised (in dollars per share)	11.71
Lapsed or canceled (in dollars per share)	18.96
Outstanding, ending balance (in dollars per share)	16.23	$ 14.18
Expected to vest (in dollars per share)	19.53
Weighted-Average Exercise Price Per Option Exercisable, Ending Balance (in dollars per share)	$ 14.81
Weighted-Average Remaining Life (Years) Outstanding	5 years 1 month 6 days	4 years 7 months 6 days
Expected to vest, Weighted-Average Remaining Life (Years)	7 years 8 months 12 days
Weighted-Average Remaining Life (Years) Exercisable	3 years 10 months 24 days
Aggregate Intrinsic Value Outstanding	$ 32	$ 21
Expected to vest, Aggregate Intrinsic Value	5
Aggregate Intrinsic Value Exercisable	$ 27

The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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Period Type:	instant

- Definition

The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.