Stock Based Awards and Other Equity Instruments - Summary of RSU Activity (Details) - Restricted Stock Units $ / shares in Units, $ in Millions	6 Months Ended
	Jun. 30, 2022 USD ($) $ / shares shares
RSUs outstanding
Unvested outstanding, Beginning balance | shares	5,786,000
Unvested RSUs, Granted | shares	5,440,000
Unvested RSUs, Vested and released | shares	(1,528,000)	[1]
Unvested RSUs, Cancelled | shares	(847,000)
Unvested outstanding, Ending balance | shares	8,851,000	[2]
Weighted Average Grant-Date Fair Value Per Share
Unvested outstanding, Weighted Average Grant-Date Fair Value Per Share, Beginning balance | $ / shares	$ 36.82
Weighted Average Grant-Date Fair Value Per Share, Granted | $ / shares	26.86
Weighted Average Grant-Date Fair Value Per Share, Vested and released | $ / shares	41.52	[1]
Weighted Average Grant-Date Fair Value Per Share, Cancelled | $ / shares	33.92
Unvested outstanding, Weighted Average Grant-Date Fair Value Per Share, Ending balance | $ / shares	$ 30.17	[2]
Aggregate Intrinsic Value
Unvested RSUs outstanding, Aggregate Intrinsic Value | $	$ 158	[2]

[1] Inclusive of approximately 340,000 RSUs withheld due to net share settlement to satisfy required employee tax withholding requirements. Potential shares which had been convertible under RSUs that were withheld under net share settlement remain in the authorized but unissued pool under the 2018 Plan and can be reissued by the Company. Total payments for the employees’ tax obligations to the taxing authorities due to net share settlements are reflected as a financing activity within the consolidated statements of cash flows.

[2] The Company accounts for forfeitures as they occur, rather than estimate expected forfeitures as allowed under GAAP and therefore do not include a forfeiture rate in our vested and expected to vest calculation unless necessary for a performance condition award.