v3.19.3

Redeemable Convertible Preferred Stock, Common Stock, and Equity (Deficit) - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
May 16, 2019 | May 14, 2019 | Jan. 31, 2019 | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Jun. 30, 2019 | Apr. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Preferred stock, shares authorized (in shares) |  |  |  | 10,000,000 |  | 10,000,000 |  |  |  |  |
Preferred stock, shares issued (in shares) |  |  |  | 0 |  | 0 |  |  |  |  |
Preferred stock, shares outstanding (in shares) |  |  |  | 0 |  | 0 |  |  |  |  |
Incremental stock-based compensation costs relating to modification of awards |  |  |  |  |  |  | $ 52 |  |  |  |
Share-based compensation expense |  |  |  | $ 401 | $ 64 | $ 4,353 | $ 147 |  |  |  |
Restricted Stock Awards, Restricted Stock Units, and Stock Appreciation Rights |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Unamortized compensation costs |  |  |  | $ 2,400 |  | $ 2,400 |  |  |  |  |
Weighted-average recognition period |  |  |  |  |  | 2 years 4 months 24 days |  |  |  |  |
2013 Plan |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Increase in stock reserved for issuance (in shares) |  |  | 85,000,000 |  |  |  |  |  |  |  |
Number of shares reserved for future issuance (in shares) |  |  | 293,000,000 |  |  |  |  |  |  |  |
2019 Plan |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of shares reserved for future issuance (in shares) |  |  |  |  |  |  |  |  | 130,000,000 |  |
Equity incentive plan, term over which available awards may increase |  |  |  |  |  | 10 years |  |  |  |  |
Equity incentive plan, percent of increase |  |  |  |  |  | 5.00% |  |  |  |  |
ESPP 2019 |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of shares reserved for future issuance (in shares) |  |  |  | 25,000,000 |  | 25,000,000 |  |  |  |  |
ESPP, percent of total shares outstanding, increase calculation |  |  |  |  |  |  |  |  |  | 1.00% |
ESPP, upper threshold on increase in authorized shares (in shares) |  |  |  |  |  |  |  | 25,000,000 |  |  |
IPO |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Conversion of shares (in shares) |  | 905,000,000 |  |  |  |  |  |  |  |  |
Stock issued during period (in shares) |  | 180,000,000 |  |  |  |  |  |  |  |  |
Stock price (in dollars per share) | $ 45.00 | $ 45.00 |  |  |  |  |  |  |  |  |
Proceeds from issuance of common stock |  | $ 8,000 |  |  |  |  |  |  |  |  |
Share-based compensation expense |  | $ 3,600 |  |  |  |  |  |  |  |  |
Shares withheld to meet tax withholding requirements (in shares) |  | 29,000,000 |  |  |  |  |  |  |  |  |
Shares withheld to meet tax withholding requirement, value |  | $ 1,300 |  |  |  |  |  |  |  |  |
Private Placement |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Stock issued during period (in shares) | 11,000,000 |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of common stock | $ 500 |  |  |  |  |  |  |  |  |  |
Series E Redeemable Convertible Preferred Stock |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of securities called by warrants (in shares) |  |  |  |  |  |  |  |  |  |  | 150,071
Series G Redeemable Convertible Preferred Stock |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of securities called by warrants (in shares) |  |  |  |  |  |  |  |  |  |  | 922,655
Common Stock | IPO |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Stock issued during period (in shares) |  | 76,000,000 |  |  |  |  |  |  |  |  |

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