Summary of Significant Accounting Policies - Schedule of Reconciliation of Basic to Diluted Weighted Average Shares Used in Computing Net Income Per Share of Common Stock, as Adjusted to Give Effect to Stock Split (Detail) - shares		3 Months Ended		6 Months Ended
		Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Accounting Policies [Abstract]
Weighted average shares used in computing net income per share of common stock, basic	[1]	971,000,000	928,000,000	966,000,000	921,000,000
Stock-based awards		93,000,000	53,000,000	95,000,000	50,000,000
Convertible senior notes	[2]	10,000,000	39,000,000	16,000,000	35,000,000
Warrants		45,000,000	16,000,000	49,000,000	10,000,000
Weighted average shares used in computing net income per share of common stock, diluted	[1]	1,119,000,000	1,036,000,000	1,126,000,000	1,016,000,000

[1] Prior period results have been adjusted to reflect the five-for-one stock split effected in the form of a stock dividend in August 2020.

[2] Under the modified retrospective method of adoption of ASU 2020-06, the dilutive impact of convertible senior notes was calculated using the if-converted method for the three and six months ended June 30, 2021. Certain convertible senior notes were calculated using the treasury stock method for the three and six months ended June 30, 2020. Refer to discussion above for further details