Equity Awards - Restricted Stock Unit Table (Details) - RSUs $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2021 USD ($) $ / shares shares
Number of Shares
Outstanding, beginning balance (in shares) | shares	7,362,000
Granted (in shares) | shares	2,004,000
Vested (in shares) | shares	(1,060,000)
Forfeited (in shares) | shares	(259,000)
Outstanding, ending balance (in shares) | shares	8,047,000
Weighted-Average Grant-Date Fair Value Per Share
Outstanding, beginning balance (in dollar per share) | $ / shares	$ 274.23
Granted (in dollar per share) | $ / shares	577.94
Vested (in dollar per share) | $ / shares	226.59
Forfeited (in dollar per share) | $ / shares	330.43
Outstanding, ending balance (in dollar per share) | $ / shares	$ 352.48
Aggregate Intrinsic Value
Aggregate intrinsic value, vested | $	$ 620