DoorDash (DASH) S-4 22 Dec 21 Registration of securities issued in business combination transactions Financial data

Cover

Cover	9 Months Ended
	Sep. 30, 2021
Entity Information [Line Items]
Document Type	S-4
Entity Registrant Name	DOORDASH, INC.
Entity Filer Category	Non-accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Central Index Key	0001792789
Amendment Flag	false

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets (unaudited) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 2,861	$ 4,345	$ 257
Short-term marketable securities	1,299	514	508
Funds held at payment processors	119	146	50
Accounts receivable, net	286	291	58
Prepaid expenses and other current assets	142	221	125
Total current assets	4,707	5,517	998
Long-term marketable securities	554
Restricted cash			30
Property and equipment, net	355	210	101
Operating lease right-of-use assets	301	203	166
Goodwill	316	316	306
Intangible assets, net	64	74	103
Other assets	61	33	28
Total assets	6,358	6,353	1,732
Current liabilities:
Accounts payable	86	80	20
Operating lease liabilities	27	15	17
Convertible notes		364
Accrued expenses and other current liabilities	1,226	943	345
Total current liabilities	1,339	1,402	382
Operating lease liabilities	339	238	167
Other liabilities	14	13	1
Total liabilities	1,692	1,653	550
Commitments and contingencies (Note 8)
Redeemable convertible preferred stock, $0.00001 par value, 235,860 and zero shares authorized, 230,667 and zero shares issued and outstanding as of December 31, 2019 and 2020, respectively; liquidation preference of $2,197 and zero as of December 31, 2019 and 2020, respectively			2,264
Stockholders' (deficit) equity:
Common stock value		0	0
Additional paid-in capital	6,592	6,313	70
Accumulated deficit	(1,926)	(1,613)	(1,152)
Total stockholders' (deficit) equity	4,666	4,700	(1,082)
Total liabilities, redeemable convertible preferred stock, and stockholders' (deficit) equity	$ 6,358	$ 6,353	$ 1,732

Condensed Consolidated Balanc_2

Condensed Consolidated Balance Sheets (unaudited) (Parenthetical) - USD ($)	Sep. 30, 2021	Dec. 31, 2020	Dec. 31, 2019
Class of Stock [Line Items]
Common stock, par value ($ per share)	$ 0.01000	$ 0.01000	$ 0.01000
Redeemable convertible preferred stock, par value ($ per share)		$ 0.01000	$ 0.01000
Rebeemable convertible preferred, authorized (shares)		0	235,860,000
Redeemable convertible preferred, issued (shares)		0	230,667,000
Redeemable convertible preferred, outstanding (shares)		0	230,667,000
Redeemable convertible preferred liquidation preference		$ 0	$ 2,197,000
Class A Common Stock
Class of Stock [Line Items]
Common stock, authorized (shares)	6,000,000,000	6,000,000,000	360,000,000
Common stock, issued (shares)	310,964,000	287,190,000	43,937,000
Common stock, outstanding (shares)	310,964,000	287,190,000	43,937,000
Class B Common Stock
Class of Stock [Line Items]
Common stock, authorized (shares)	200,000,000	200,000,000	0
Common stock, issued (shares)	31,459,000	31,313,000	0
Common stock, outstanding (shares)	31,459,000	31,313,000	0
Class C Common Stock
Class of Stock [Line Items]
Common stock, authorized (shares)	2,000,000,000	2,000,000,000	0
Common stock, issued (shares)	0	0	0
Common stock, outstanding (shares)	0	0	0

Condensed Consolidated Statemen

Condensed Consolidated Statements of Operations (unaudited) - USD ($) shares in Thousands, $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Statement [Abstract]
Revenue	$ 1,275	$ 879	$ 3,588	$ 1,916	$ 2,886	$ 885	$ 291
Costs and expenses:
Cost of revenue, exclusive of depreciation and amortization shown separately below	585	382	1,703	899	1,368	523	228
Sales and marketing	446	290	1,206	610	957	594	135
Research and development	115	41	297	112	321	107	51
General and administrative	188	167	573	337	556	245	78
Depreciation and amortization	41	34	107	89	120	32	9
Total costs and expenses	1,375	914	3,886	2,047	3,322	1,501	501
Loss from operations	(100)	(35)	(298)	(131)	(436)	(616)	(210)
Interest income		1	2	6	7	18	7
Interest expense		(9)	(13)	(22)	(32)		(1)
Other income (expense), net	(1)	1	(1)		3	(68)
Loss before provision for income taxes	(101)	(42)	(310)	(147)	(458)	(666)	(204)
Provision for income taxes	0	1	3	2	3	1	0
Net loss	$ (101)	$ (43)	$ (313)	$ (149)	(461)	(667)	(204)
Premium paid on repurchase of redeemable convertible preferred stock							(3)
Deemed dividend to preferred stockholders						(1)
Earnings Per Share
Net loss attributable to common stockholders					$ (461)	$ (668)	$ (207)
Net loss per share attributabe to common stockholders, basic and diluted ($ per share)					$ (7.39)	$ (15.44)	$ (4.67)
Net loss per share attributable to common stockholders, basic (in $ per share)	$ 300	$ 960	$ 940	$ 3,340
Weighted-average number of shares outstanding used to compute net loss per share attributable to common stockholders, basic (in shares)	340,169	45,016	334,277	44,568
Weighted-average number of shares outstanding used to compute net loss per share attributable to common stockholders, basic and diluted (in shares)					62,390	43,252	44,305

Condensed Consolidated Statem_2

Condensed Consolidated Statements of Comprehensive Loss (unaudited) - USD ($) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Statement of Comprehensive Income [Abstract]
Net loss	$ (101)	$ (43)	$ (313)	$ (149)	$ (461)	$ (667)	$ (204)
Other comprehensive income (loss):
Change in unrealized gain (loss) on marketable securities		(1)		1		1	(1)
Total other comprehensive income (loss)		(1)		1		1	(1)
Comprehensive loss	$ (101)	$ (44)	$ (313)	$ (148)	$ (461)	$ (666)	$ (205)

Condensed Consolidated Statem_3

Condensed Consolidated Statements of Redeemable Convertible Preferred Stock and Stockholders' Equity (Deficit) (unaudited) - USD ($) shares in Thousands, $ in Millions	Total	Common Stock	Additional Paid-in Capital	Accumulated Deficit	Accumulated Other Comprehensive Income (Loss)	Redeemable Convertible Preferred Stock	Redeemable Convertible Preferred StockAdditional Paid-in Capital	Series H redeemable convertible preferred stock	Series D redeemable convertible preferred stock	Series E redeemable convertible preferred stock	Series F redeemable convertible preferred stock	Series G redeemable convertible preferred stock
Common stock, outstanding (shares), beginning at Dec. 31, 2017		44,128
Beginning balance at Dec. 31, 2017	$ (198)	$ 0	$ 23	$ (221)	$ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of redeemable convertible preferred stock, net of issuance costs (shares)									86,256	18,055
Issuance of redeemable convertible preferred stock, net of issuance costs									$ 475	$ 250
Stock Issued During Period, Shares, Conversion of Convertible Securities									11,752
Conversion of promissory notes to Series D redeemable convertible preferred stock									$ 60
Issuance of common stock upon exercise of stock options (shares)		4,882
Issuance of common stock upon exercise of stock options	5		5
Stock-based compensation	25		25
Other comprehensive income	(1)				(1)
Net loss	(204)	$ (204)		(204)
Common stock, outstanding (shares), ending at Dec. 31, 2018		41,802
Ending balance at Dec. 31, 2018	(436)	$ 0	50	(485)	(1)
Redeemable convertible preferred stock, outstanding (shares), beginning at Dec. 31, 2017						75,550
Beginning balance at Dec. 31, 2017						$ 200
Increase (Decrease) in Temporary Equity [Roll Forward]
Repurchase and retirement of stock (shares)		(7,208)
Repurchase and retirement of preferred stock (shares)						(297)
Repurchase and retirement of stock	$ (60)			(60)		$ (3)	$ (3)
Redeemable convertible preferred stock, outstanding (shares), ending at Dec. 31, 2018						191,316
Ending balance at Dec. 31, 2018						$ 985
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of redeemable convertible preferred stock, net of issuance costs (shares)											18,186	18,529
Issuance of redeemable convertible preferred stock, net of issuance costs											$ 408	$ 703
Shares withheld related to net share settlement (shares)	(65)
Issuance of common stock upon exercise of stock options (shares)		2,135
Issuance of common stock upon exercise of stock options	$ 3		3
Issuance of Series G redeemable convertible preferred stock in connection with the acquisition of Caviar (shares)												2,636
Issuance of Series G redeemable convertible preferred stock in connection with the acquisition of Caviar												$ 100
Deemed dividend to preferred stockholders	(1)		(1)
Stock-based compensation	18		18
Other comprehensive income	1				1
Net loss	(667)	$ (667)		(667)
Common stock, outstanding (shares), ending at Dec. 31, 2019		43,937
Ending balance at Dec. 31, 2019	$ (1,082)	$ 0	70	(1,152)	0
Increase (Decrease) in Temporary Equity [Roll Forward]
Forward contract liability recognized in connection with Series F redeemable convertible preferred stock											$ 68
Redeemable convertible preferred stock, outstanding (shares), ending at Dec. 31, 2019	230,667					230,667
Ending balance at Dec. 31, 2019	$ 2,264					$ 2,264
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock upon exercise of stock options (shares)		366
Issuance of common stock upon exercise of stock options	1		1
Stock-based compensation	5		5
Other comprehensive income	3				3
Net loss	(129)			(129)
Common stock, outstanding (shares), ending at Mar. 31, 2020		44,303
Ending balance at Mar. 31, 2020	(1,202)	$ 0	76	(1,281)	3
Redeemable convertible preferred stock, outstanding (shares), ending at Mar. 31, 2020						230,667
Ending balance at Mar. 31, 2020						$ 2,264
Common stock, outstanding (shares), beginning at Dec. 31, 2019		43,937
Beginning balance at Dec. 31, 2019	(1,082)	$ 0	70	(1,152)	0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Other comprehensive income	1
Net loss	(149)	$ (149)
Common stock, outstanding (shares), ending at Sep. 30, 2020		45,382
Ending balance at Sep. 30, 2020	$ (1,213)	$ 0	87	(1,301)	1
Redeemable convertible preferred stock, outstanding (shares), beginning at Dec. 31, 2019	230,667					230,667
Beginning balance at Dec. 31, 2019	$ 2,264					$ 2,264
Redeemable convertible preferred stock, outstanding (shares), ending at Sep. 30, 2020						238,988
Ending balance at Sep. 30, 2020						$ 2,646
Common stock, outstanding (shares), beginning at Dec. 31, 2019		43,937
Beginning balance at Dec. 31, 2019	(1,082)	$ 0	70	(1,152)	0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock upon settlement of RSUs (shares)		65
Issuance of redeemable convertible preferred stock, net of issuance costs (shares)								8,322
Issuance of redeemable convertible preferred stock, net of issuance costs								$ 382
Shares withheld related to net share settlement (shares)		(65)
Shares withheld related to net share settlement	(7)		(7)
Stock Issued During Period, Shares, Conversion of Convertible Securities		239,270				(238,984)
Conversion of promissory notes to Series D redeemable convertible preferred stock	$ 2,646		2,646			$ (2,646)
Issuance of common stock upon exercise of stock options (shares)	2,191	2,191
Issuance of common stock upon exercise of stock options	$ 5		5
Stock-based compensation	330		330
Net loss	(461)			(461)
Issuance of common stock in connection with initial public offering, net of offering costs, underwriting discounts and commissions (Shares)		33,000
Issuance of common stock in connection with initial public offering, net of offering costs, underwriting discounts and commissions	3,269		3,269
Issuance of common stock upon exercise of common stock warrants (shares)		105
Common stock, outstanding (shares), ending at Dec. 31, 2020		318,503
Ending balance at Dec. 31, 2020	$ 4,700	$ 0	6,313	(1,613)	0
Redeemable convertible preferred stock, outstanding (shares), beginning at Dec. 31, 2019	230,667					230,667
Beginning balance at Dec. 31, 2019	$ 2,264					$ 2,264
Increase (Decrease) in Temporary Equity [Roll Forward]
Repurchase and retirement of preferred stock (shares)						(5)
Redeemable convertible preferred stock, outstanding (shares), ending at Dec. 31, 2020	0					0
Ending balance at Dec. 31, 2020						$ 0
Common stock, outstanding (shares), beginning at Mar. 31, 2020		44,303
Beginning balance at Mar. 31, 2020	$ (1,202)	$ 0	76	(1,281)	3
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of redeemable convertible preferred stock, net of issuance costs (shares)								8,321
Issuance of redeemable convertible preferred stock, net of issuance costs								$ 382
Issuance of common stock upon exercise of stock options (shares)		406
Issuance of common stock upon exercise of stock options	1		1
Stock-based compensation	5		5
Other comprehensive income	(1)				(1)
Net loss	23			23
Common stock, outstanding (shares), ending at Jun. 30, 2020		44,709
Ending balance at Jun. 30, 2020	(1,174)	$ 0	82	(1,258)	2
Redeemable convertible preferred stock, outstanding (shares), beginning at Mar. 31, 2020						230,667
Beginning balance at Mar. 31, 2020						$ 2,264
Redeemable convertible preferred stock, outstanding (shares), ending at Jun. 30, 2020						238,988
Ending balance at Jun. 30, 2020						$ 2,646
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock upon exercise of stock options (shares)		673
Issuance of common stock upon exercise of stock options	2		2
Stock-based compensation	3		3
Other comprehensive income	(1)				(1)
Net loss	(43)	$ (43)		(43)
Common stock, outstanding (shares), ending at Sep. 30, 2020		45,382
Ending balance at Sep. 30, 2020	(1,213)	$ 0	87	(1,301)	1
Redeemable convertible preferred stock, outstanding (shares), ending at Sep. 30, 2020						238,988
Ending balance at Sep. 30, 2020						$ 2,646
Common stock, outstanding (shares), beginning at Dec. 31, 2020		318,503
Beginning balance at Dec. 31, 2020	4,700	$ 0	6,313	(1,613)	0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock upon settlement of RSUs (shares)		1,836
Shares withheld related to net share settlement (shares)		(802)
Shares withheld related to net share settlement	(166)		(166)
Issuance of common stock upon exercise of stock options (shares)		5,989
Issuance of common stock upon exercise of stock options	13		13
Stock-based compensation	118		118
Net loss	(110)			(110)
Common stock, outstanding (shares), ending at Mar. 31, 2021		325,526
Ending balance at Mar. 31, 2021	$ 4,555	$ 0	6,278	(1,723)
Redeemable convertible preferred stock, outstanding (shares), beginning at Dec. 31, 2020	0					0
Beginning balance at Dec. 31, 2020						$ 0
Common stock, outstanding (shares), beginning at Dec. 31, 2020		318,503
Beginning balance at Dec. 31, 2020	$ 4,700	$ 0	6,313	(1,613)	0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock upon exercise of stock options (shares)	12,346
Net loss	$ (313)
Common stock, outstanding (shares), ending at Sep. 30, 2021		342,423
Ending balance at Sep. 30, 2021	$ 4,666	$ 0	6,592	(1,926)	0
Redeemable convertible preferred stock, outstanding (shares), beginning at Dec. 31, 2020	0					0
Beginning balance at Dec. 31, 2020						$ 0
Common stock, outstanding (shares), beginning at Mar. 31, 2021		325,526
Beginning balance at Mar. 31, 2021	$ 4,555	$ 0	6,278	(1,723)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock upon settlement of RSUs (shares)		8,056
Shares withheld related to net share settlement (shares)		(44)
Shares withheld related to net share settlement	(6)		(6)
Issuance of common stock upon exercise of stock options (shares)		3,986
Issuance of common stock upon exercise of stock options	10		10
Stock-based compensation	162		162
Net loss	(102)			(102)
Common stock, outstanding (shares), ending at Jun. 30, 2021		337,524
Ending balance at Jun. 30, 2021	4,619	$ 0	6,444	(1,825)	0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock upon settlement of RSUs (shares)		2,528
Issuance of common stock upon exercise of stock options (shares)		2,371
Issuance of common stock upon exercise of stock options	5		5
Stock-based compensation	143		143
Net loss	(101)			(101)
Common stock, outstanding (shares), ending at Sep. 30, 2021		342,423
Ending balance at Sep. 30, 2021	$ 4,666	$ 0	$ 6,592	$ (1,926)	$ 0

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Millions	9 Months Ended		12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Cash flows from operating activities
Net loss	$ (313)	$ (149)	$ (461)	$ (667)	$ (204)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation and amortization	107	89	120	32	9
Change in fair value of forward contract liability			0	67	0
Stock-based compensation	357	11	322	18	24
Bad debt expense	31	15	16	4	0
Reduction of operating lease right-of-use assets and accretion of operating lease liabilities	37	30	40	22	0
Non-cash interest expense	11	22	31	0	0
Impairment of operating lease right-of-use assets	1	11	11
Other	17	7	18	0	0
Changes in operating assets and liabilities:
Funds held at payment processors	27	(30)	(96)	(9)	(19)
Accounts receivable, net	(26)	(139)	(248)	(40)	(17)
Prepaid expenses and other current assets	86	6	(96)	(88)	(30)
Other assets	(32)	(14)	(20)	(18)	(5)
Accounts payable	8	12	54	(13)	25
Accrued expenses and other current liabilities	241	452	587	251	48
Payments for operating lease liabilities	(29)	(19)	(26)	(3)	0
Other liabilities	2	11	11	(23)	10
Net cash provided by operating activities	525	315	252	(467)	(159)
Cash flows from investing activities
Purchases of property and equipment	(94)	(86)	(106)	(78)	(13)
Capitalized software and website development costs	(73)	(36)	(53)	(14)	(3)
Purchases of marketable securities	(1,968)	(445)	(593)	(762)	(390)
Maturities of marketable securities	502	434	583	440	49
Sales of marketable securities	121	4	4	160	0
Other investing activities	(8)		1	(1)	0
Net cash used in investing activities	(1,520)	(129)	(192)	(570)	(357)
Acquisitions, net of cash acquired			(28)	(315)	0
Cash flows from financing activities
Proceeds from issuance of preferred stock, net of issuance costs		382	382	1,111	725
Proceeds from issuance of convertible notes, net of issuance costs		333	333	0	0
Repayment of convertible notes	(333)
Proceeds from exercise of stock options	28	4	5	3	5
Deferred offering costs paid	(10)	(5)	(6)	(3)	0
Taxes paid related to net share settlement of equity awards	(172)		(7)	0	0
Proceeds from issuance of common stock upon initial public offering, net of underwriter discounts			3,289	0	0
Repurchase of common stock			0	0	(60)
Other financing activities			0	(2)	(4)
Net cash provided by (used in) financing activities	(487)	714	3,996	1,109	666
Foreign currency effect on cash, cash equivalents, and restricted cash	(1)		2	0	0
Net increase (decrease) in cash, cash equivalents, and restricted cash	(1,483)	900	4,058	72	150
Cash, cash equivalents, and restricted cash, beginning of period	4,345	287	287	215	65
Cash, cash equivalents, and restricted cash, end of period	$ 2,862	$ 1,187	$ 4,345	$ 287	$ 215

Consolidated Statements of Ca_2

Consolidated Statements of Cash Flows (Parenthetical) - USD ($) $ in Millions	9 Months Ended		12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Reconciliation of cash, cash equivalents, and restricted cash to the condensed consolidated balance sheets
Cash and cash equivalents	$ 2,861	$ 1,096	$ 4,345	$ 257	$ 215
Restricted cash	1	91	0	30	0
Total cash, cash equivalents, and restricted cash	2,862	1,187	4,345	287	215
Supplemental disclosure of cash flow information
Cash paid for interest	42
Cash paid for income taxes	4	1
Non-cash investing and financing activities
Conversion of redeemable convertible preferred stock to common stock upon initial public offering			2,646	0	0
Purchases of property and equipment not yet settled	24	9	17	14	3
Conversion of convertible promissory notes to preferred stock			0	0	60
Redeemable Convertible Preferred Stock Issued In Connection With Acquisition		0		100	0
Leasehold improvements acquired through tenant improvement allowance	4	9		0	0
Deferred offering costs not yet paid		2
Deferred offering costs not yet paid		10		2	0
Stock-based compensation included in capitalized software and website development costs	$ 66	2	$ 8	0	0
Unrealized gain on marketable securities		1
Holdback consideration for acquisitions		$ 3		$ 0	$ 0

Organization and Description of

Organization and Description of Business	9 Months Ended	12 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Organization and Description of Business	1. Organization and Description of Business DoorDash, Inc. (the “Company”), is incorporated in Delaware with headquarters in San Francisco, California. The Company provides a local logistics platform that enables local businesses to address consumers’ expectations of ease and immediacy and thrive in today’s convenience economy. The Company’s local logistics platform connects merchants, consumers, and Dashers. The Company operates the DoorDash Marketplace, which enables merchants to establish an online presence and expand their reach by connecting them with consumers (the “Marketplace”). Merchants can fulfill this demand with independent contractors who use the Company’s platform to deliver orders (“Dashers”). As part of the Marketplace, the Company also offers Pickup, which allows consumers to place advance orders, skip lines, and pick up their orders conveniently with no consumer fees, as well as DoorDash for Work, which provides merchants on the Company’s platform with large group orders and catering orders for businesses and events. The Marketplace also includes DashPass, the Company’s membership product, which was formerly referred to the Company’s subscription product, which provides consumers with unlimited access to eligible merchants with zero delivery fees and reduced service fees. In addition to the Marketplace, the Company offers Platform Services, which primarily includes DoorDash Drive, or Drive, a white-label logistics service that enables merchants that have generated consumer demand through their own channels to fulfill this demand using the Company’s local logistics platform, and DoorDash Storefront, or Storefront, that enables merchants to create their own branded online ordering experience, providing them with a turnkey solution to offer consumers on-demand e-commerce in-house	1. Organization and Description of Business Description of Business DoorDash, Inc. (the “Company”), is incorporated in Delaware with headquarters in San Francisco, California. The Company provides a local logistics platform that enables local brick-and-mortar The Company’s local logistics platform connects merchants, consumers, and Dashers. The Company operates the DoorDash Marketplace, which enables merchants to establish an online presence and expand their reach by connecting them with consumers (the “Marketplace”). Merchants can either fulfill this demand with independent contractors who use the Company’s platform to deliver orders (“Dashers”) or by in-person on-demand e-commerce in-house Initial Public Offering On December 9, 2020, the Company completed its initial public offering (“IPO”) in which it issued and sold 33 million shares of its Class A common stock at the public offering price of $102.00 per share. The Company received net proceeds of $3.3 billion after deducting underwriting discounts and commissions and offering costs. Immediately prior to the completion of the IPO, all shares of the Company’s outstanding redeemable convertible preferred stock automatically converted into 239 million shares of its common stock. Additionally, immediately prior to the completion of the IPO, the Company filed its Amended and Restated Certificate of Incorporation, which authorizes a total of 6.0 billion shares of Class A common stock, 200 million shares of Class B common stock, 2.0 billion shares of Class C common stock, and 600 million shares of preferred stock. Upon the filing of the Amended and Restated Certificate of Incorporation, 285 million shares of the Company’s common stock were automatically reclassified into an equivalent number of shares of the Company’s Class A common stock (the “Reclassification”). Immediately after the Reclassification and prior to the completion of the IPO, a total of 31 million shares of Class A common stock held by Tony Xu, Andy Fang, Stanley Tang, and their respective affiliated trusts were exchanged for an equivalent number of shares of Class B common stock pursuant to the terms of certain exchange agreements. As a result, following the completion of the IPO, the Company has three classes of authorized common stock: Class A common stock, Class B common stock, and Class C common stock, of which Class A common stock and Class B common stock were outstanding as of December 31, 2020. The Company granted certain employees restricted stock units (“RSUs”) with both service-based and liquidity event-related performance vesting conditions (“IPO Vested RSUs”). Upon the consummation of the Company’s IPO, the Company recognized $279 million of stock-based compensation expense for IPO Vested RSUs as the performance vesting condition was satisfied. One share of Class A common stock for each of the IPO Vested RSUs will be delivered on the applicable settlement date, which is approximately 180 days after the IPO. The future tax benefits on settlement of the above RSUs is not expected to be material as currently the Company has established valuation allowances to reduce its net deferred tax assets to the amount that is more likely than not to be realized. To meet the related tax withholding requirements related to IPO Vested RSUs, for stockholders who elected to net share settle, the Company withheld 65,058 shares of Class A common stock subject to the vesting of the IPO Vested RSUs and paid $7 million to the relevant tax authorities in cash to satisfy such tax obligations as well as any income tax withholding obligations arising as a result of settlement of such shares. Certain employees elected to receive a short-term loan from the Company, with interest that will accrue at the applicable federal rate. The short-term loan extended to employees totaled $10 million as of December 31, 2020 and is included within prepaid expenses and other current assets on the Company’s consolidated balance sheets. The balance of the loan is repayable from the proceeds of sale of shares into the market on the settlement date. Stock Splits In November 2020, the Company’s board of directors and the stockholders of the Company approved a five-for-one five-for-one

Summary of Significant Accounti

Summary of Significant Accounting Policies	9 Months Ended	12 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	2. Summary of Significant Accounting Policies Basis of Presentation The accompanying unaudited condensed consolidated financial statements include the accounts of DoorDash, Inc. and its wholly-owned subsidiaries and have been prepared in accordance with accounting principles generally accepted in the United States of America (“GAAP”) and the requirements of the U.S. Securities and Exchange Commission (the “SEC”) for interim reporting. All intercompany transactions have been eliminated in consolidation. These unaudited condensed consolidated interim financial statements reflect all normal recurring adjustments that are, in the opinion of management, necessary to fairly present the information set forth herein. They should be read in conjunction with the audited consolidated financial statements and related notes included in the Company’s Annual Report on Form 10-K Reclassifications Certain amounts from prior periods have been reclassified to conform to the current period presentation. Use of Estimates The preparation of condensed consolidated financial statements in accordance with GAAP requires management to make certain estimates, judgments, and assumptions that affect the reported amounts of assets and liabilities and the related disclosures at the date of the financial statements, as well as the reported amounts of revenue and expenses during Estimates for credit losses, gift card breakage, estimated useful lives of property and equipment, capitalized software and website development costs, intangible assets, stock-based compensation, valuation of investments and other financial instruments, valuation of acquired intangible assets and goodwill, the incremental borrowing rate applied in lease accounting, insurance reserves, loss contingencies, and income and indirect taxes. Actual results could differ from these estimates. Significant Accounting Policies There have been no material changes to the Company’s significant accounting policies from its Annual Report on Form 10-K Gift Cards The Company sells gift cards to consumers that can be redeemed through its Marketplace. Those gift cards have no expiration date and administrative fees are not charged on unused gift cards. In prior periods, with limited history as to consumers’ redemption patterns, proceeds from the sale of gift cards were fully deferred and recorded as contract liabilities until consumers use the card to place orders on its platform. When gift cards are redeemed, revenue is recognized on a net basis as the difference between the amounts collected from consumers less amounts remitted to merchants and Dashers. During the third quarter of 2021, the Company concluded that it had developed sufficient historical evidence regarding the pattern of consumer redemptions of gift cards to have the ability to estimate the portion of outstanding gift cards that will never be redeemed (“breakage”) and for which there is no legal obligation to remit the value of the unredeemed gift cards to the relevant jurisdiction as unclaimed or abandoned property. The Company recognizes the breakage amounts as revenue, proportionate to the pattern of revenue recognition for the gift card redemptions. As a result of this change in estimate, the Company recorded $36 million of gift card breakage revenue during the three months ended September 30, 2021. Estimating future breakage rates requires judgment based on current and historical patterns of redemption, and the actual breakage rates may vary from the estimate.	2. Summary of Significant Accounting Policies Basis of Presentation The accompanying consolidated financial statements include the accounts of DoorDash, Inc. and its wholly-owned subsidiaries and have been prepared in accordance with accounting principles generally accepted in the United States of America (“GAAP”). All intercompany transactions have been eliminated in consolidation. Reclassifications Certain amounts from prior periods have been reclassified to conform to the current period presentation. Segments Operating segments are defined as components of an entity for which separate financial information is available and that is regularly reviewed by the Chief Operating Decision Maker (“CODM”) in deciding how to allocate resources to an individual segment and in assessing performance. The Company’s Chief Executive Officer is the Company’s CODM. The CODM reviews financial information presented on a consolidated basis for purposes of making operating decisions, allocating resources, and evaluating financial performance. As such, the Company has determined that it operates in one reportable segment. See Note 3 for revenue by geography. As of December 31, 2019, long-lived assets located outside of the United States were not material. As of December 31, 2020, long-lived assets located outside of the United States were $21 million. Use of Estimates The preparation of consolidated financial statements in accordance with GAAP requires management to make certain estimates, judgments, and assumptions that affect the reported amounts of assets and liabilities and the related disclosures at the date of the financial statements, as well as the reported amounts of revenue and expenses during the period presented. Estimates include, but are not limited to, revenue recognition, allowances for credit losses, estimated useful lives of property and equipment, capitalized software and website development costs, intangible assets, stock-based compensation, valuation of investments and other financial instruments, valuation of acquired intangible assets and goodwill, the incremental borrowing rate applied in lease accounting, insurance reserves, loss contingencies, and income and indirect taxes. Actual results could differ from these estimates. Business Combinations The Company accounts for business combinations using the acquisition method of accounting, which requires, among other things, allocation of the fair value of purchase consideration to the tangible and intangible assets acquired and liabilities assumed at their estimated fair values on the acquisition date. The excess of the fair value of purchase consideration over the values of these identifiable assets and liabilities is recorded as goodwill. When determining the fair value of assets acquired and liabilities assumed, management makes significant estimates and assumptions, especially with respect to the valuation of intangible assets. Management’s estimates of fair value are based upon assumptions believed to be reasonable, but which are inherently uncertain and unpredictable and, as a result, actual results may differ from estimates. During the measurement period, not to exceed one year from the date of acquisition, the Company may record adjustments to the assets acquired and liabilities assumed, with a corresponding offset to goodwill if new information is obtained related to facts and circumstances that existed as of the acquisition date. Upon the conclusion of the measurement period or final determination of the fair value of assets acquired or liabilities assumed, whichever comes first, any subsequent adjustments are reflected in the consolidated statements of operations. Acquisition costs, such as legal and consulting fees, are expensed as incurred. Cash, Cash Equivalents, and Restricted Cash Cash includes demand deposits with banks or financial institutions as well as cash in transit from payment processors. Cash equivalents include short-term, highly liquid investments with original maturities of three months or less and their carrying values approximate fair value due to their short-term maturities. Restricted cash consists of collateral provided for letters of credit established primarily for real estate leases and insurance policies. As of December 31, 2020, the restricted cash balance was not material. Marketable Securities Marketable securities primarily consist of commercial paper, U.S. government agency securities, U.S. Treasury securities, and corporate bonds. The Company invests in a diversified portfolio of marketable securities and limits the concentration of its investment in any particular security. Securities with original maturities greater than three months, but less than one year, are included in current assets and securities with original maturities greater than one year are included in non-current available-for-sale If the estimated fair value of an available-for-sale Funds Held at Payment Processors Funds held at payment processors represent cash due from the Company’s payment processors for cleared transactions with merchants and consumers, as well as funds transferred to payment processors for Dasher payout. Accounts Receivable, Net and Allowance for Credit Losses Accounts receivable, net primarily represents receivables from merchants generated through the Company’s Drive offering. The Company maintains an allowance for credit losses, which is based on the Company’s assessment of the collectability of accounts. The Company regularly reviews the adequacy of the allowance for credit losses on a collective basis by considering the age of each outstanding invoice, each customer’s expected ability to pay and collection history, current market conditions, and reasonable and supportable forecasts of future economic conditions to determine whether the allowance is appropriate. Accounts receivable deemed uncollectible are charged against the allowance for credit losses when identified. The Company recorded $16 million of bad debt expense in the year ended December 31, 2020. Write-off As of December 31, 2019 and 2020, allowance for credit losses on accounts receivable was $2 million and $13 million, respectively. Property and Equipment, Net Property and equipment are recorded at cost and depreciated using the straight-line method over the estimated useful lives of the related assets. The useful lives are as follows: Estimated Useful Life Equipment for merchants 2 years Computer equipment and software 2 years Office equipment 5 years Capitalized software and website development costs 2 years Leasehold improvements Shorter of estimated useful life or lease term Maintenance and repair costs are charged to expense as incurred. Upon disposal of a fixed asset, the Company records a gain or loss based on the difference between the proceeds received and the net book value of the disposed asset. There were no disposals during the year ended December 31, 2018 and disposals were not material for the years ended December 31, 2019 and 2020. Goodwill Goodwill represents the excess of the purchase price over the fair value of the net tangible and intangible assets acquired in a business combination. Goodwill is not amortized, but is tested for impairment at least annually or more frequently if events or changes in circumstances indicate that the asset may be impaired. The Company’s impairment tests are based on a single operating segment and reporting unit structure. If the carrying value of the reporting unit exceeds its fair value, an impairment charge is recognized for the excess of the carrying value of the reporting unit over its fair value. The Company conducted its annual goodwill impairment test during the fourth quarter of 2020 and determined that the fair value of the reporting unit significantly exceeded its carrying value. No impairment charge was recorded in any of the periods presented in the accompanying consolidated financial statements. Intangible Assets, Net Intangible assets are recorded at fair value as of the date of acquisition and amortized on a straight-line basis over their estimated useful lives. The Company reviews identifiable amortizable intangible assets to be held and used for impairment under the long-lived asset model described under “Impairment of Long-Lived Assets” below. Capitalized Software and Website Development Costs The Company incurred costs relating to the development of the Company’s technology platform, which includes Dasher and merchant tools, mobile apps, and website and content development. Software development costs related to software acquired, developed, or modified solely to meet the Company’s internal requirements, with no substantive plans to market such software at the time of development, are capitalized during the application development stage of the project. Costs incurred during the preliminary planning and evaluation stage of the project and during the post implementation operational stage are expensed as incurred. Costs to develop the Company’s technology platform are capitalized when preliminary development efforts are successfully completed, management has authorized and committed project funding, and it is probable that the project will be completed and the software will be used as intended. Costs incurred for enhancements that are expected to result in additional functionality are capitalized and expensed over the estimated useful life of the upgrades on a per project basis. Impairment of Long-Lived Assets The Company evaluates its long-lived assets or asset groups for indicators of possible impairment by comparison of the carrying amount to future net undiscounted cash flows expected to be generated by such asset or asset group when events or changes in circumstances indicate the carrying amount of an asset or asset group may not be recoverable. Should an impairment exist, the impairment loss would be measured based on the excess carrying value of the asset or asset group over the asset’s or asset group’s fair value generally determined by estimates of future discounted cash flows. Assets to be disposed of are reported at the lower of their carrying amount or fair value less costs to sell. During the year ended December 31, 2020, the Company recognized an impairment of $11 million related to an operating lease right-of-use Insurance Reserves The Company utilizes a combination of third-party insurance and self-insurance programs to insure costs including auto liability related to both bodily injury and physical damage, and uninsured and underinsured motorists up to a certain dollar retention limit. The recorded self-insurance reserves reflect the estimated cost for claims incurred but not paid and claims that have been incurred but not yet reported. The estimate of the Company’s self-insured ultimate obligation utilizes actuarial techniques applied to historical claim and loss experience. The Company utilizes assumptions based on actuarial judgment with consideration toward relevant industry claim and loss development factors, which includes the development time frame and settlement patterns, and expected loss rates. To limit exposure to some risks, the Company maintains additional insurance coverage with varying limits and retentions. The Company cannot predict whether this insurance will be adequate to cover all potential hazards incidental to its business. Reserves are periodically reviewed and adjusted as necessary as experience develops or new information becomes known. However, ultimate results may differ from the Company’s estimates, which could result in losses over the Company’s reserved amounts. Loss Contingencies The Company is involved in various lawsuits, claims, investigations, and proceedings that arise in connection with its business. Certain of these matters include speculative claims for substantial or indeterminate amounts of damages. The Company records a liability in accrued expenses and other current liabilities on the consolidated balance sheets when the Company believes that it is both probable that a loss has been incurred and the amount or range can be reasonably estimated. The Company discloses material contingencies when it believes that a loss is not probable but reasonably possible. Significant judgment is required to determine both probability and the estimated amount. The Company reviews these provisions on a quarterly basis and adjusts these provisions accordingly to reflect the impact of negotiations, settlements, rulings, advice of legal counsel, and updated information. Sales and Indirect Taxes The Company records sales and indirect tax liabilities when they become probable and the amount can be reasonably estimated. Sales and indirect tax liabilities are included in accrued expenses and other current liabilities on the consolidated balance sheets. Accumulated Other Comprehensive Income (Loss) Accumulated other comprehensive income (loss) consists of foreign currency translation adjustments and unrealized gains and losses on available-for-sale Available-for-sale Stock-Based Compensation The Company estimates the fair value of stock options granted to employees and directors using the Black-Scholes option-pricing model. The fair value of stock options is recognized as compensation expense on a straight-line basis over the requisite service period, which is typically four years. The Black-Scholes model considers several variables and assumptions in estimating the fair value of stock-based awards. These variables include: • per share fair value of the underlying common stock; • exercise price; • expected term; • risk-free interest rate; • expected stock price volatility over the expected term; and • expected annual dividend yield. For all stock options granted, the Company calculated the expected term using the simplified method for “plain vanilla” stock option awards. The risk-free interest rate is based on the yield available on U.S. Treasury zero-coupon The fair value of RSUs is estimated based on the fair value of the Company’s common stock on the date of grant. Prior to November 2020, RSUs granted by the Company vest upon the satisfaction of both a service-based vesting condition, which is typically four years, and a liquidity event-related performance vesting condition. The liquidity event-related performance vesting condition was achieved upon the consummation of the Company’s IPO, and the Company recorded a cumulative stock-based compensation expense of $279 million as of the IPO date for those RSUs for which the service-based vesting condition has been satisfied. Stock-based compensation related to the remaining service-based period after the liquidity event-related performance vesting condition was satisfied will be recorded over the remaining requisite service period using the accelerated attribution method. Since November 2020, with the exception of the CEO Performance Award (as discussed further in Note 12), the Company only granted RSUs that vest upon the satisfaction of a service-based vesting condition and the compensation expense for these RSUs is recognized on a straight-line basis over the requisite service period. For the CEO Performance Award that includes a market condition, the fair value of the award is determined using a Monte Carlo simulation model. The associated stock-based compensation is recorded over the derived service period, using the accelerated attribution method. If the stock price goals are met sooner than the derived service period, the Company will adjust the stock-based compensation expense to reflect the cumulative expense associated with the vested award. Provided that Tony Xu continues to be the Chief Executive Officer of the Company, Stock-based compensation expense is recognized over the requisite service period, regardless of whether the stock price goals are achieved. Prior to the IPO, the fair value of the shares of common stock underlying the stock options and RSUs has historically been determined by the Company’s board of directors as there is no public market for the underlying common stock. The Company’s board of directors determined the fair value of the Company’s common stock by considering a number of objective and subjective factors including: contemporaneous third-party valuations of its common stock, the valuation of comparable companies, sales of the Company’s common and redeemable convertible preferred stock to outside investors in arms-length transactions (including the IPO), the Company’s operating and financial performance, the lack of marketability, and the general and industry specific economic outlook, amongst other factors. After the completion of the IPO, the fair value of the Company’s Class A common stock is determined based on the New York Stock Exchange (“NYSE”) closing price on the date of grant. The Company records forfeitures when they occur for all share-based payment awards. Provision for Income Taxes The Company accounts for income taxes using the asset and liability method. Under this method, deferred income tax assets and liabilities are recorded based on the estimated future tax effects of differences between the financial statement and income tax basis of existing assets and liabilities. These differences are measured using the enacted statutory tax rates that are expected to apply to taxable income for the years in which differences are expected to reverse. The Company recognizes the effect on deferred income taxes of a change in tax rates in the period that includes the enactment date. The Company records a valuation allowance to reduce its deferred tax assets to the net amount that it believes is more-likely-than-not The Company operates in various tax jurisdictions and is subject to audit by tax authorities. The Company recognizes the tax benefit of an uncertain tax position only if it is more-likely-than-not Fair Value The Company measures certain assets and liabilities at fair value on a recurring basis based on an expected exit price, which represents the amount that would be received on the sale of an asset or paid to transfer a liability in an orderly transaction between market participants. As such, fair value may be based on assumptions that market participants would use in pricing an asset or liability. The authoritative guidance on fair value measurements establishes a consistent framework for measuring fair value on either a recurring or nonrecurring basis, whereby inputs used in valuation techniques, are assigned a hierarchical level. The following are the hierarchical levels of inputs to measure fair value: Level 1 Observable inputs that reflect quoted prices (unadjusted) for identical assets or liabilities in active markets. Level 2 Inputs reflect quoted prices for identical assets or liabilities in markets that are not active; quoted prices for similar assets or liabilities in active markets; inputs other than quoted prices that are observable for the assets or liabilities; or inputs that are derived principally from or corroborated by observable market data by correlation or other means. Level 3 Unobservable inputs reflecting the Company’s own assumptions incorporated in valuation techniques used to determine fair value. These assumptions are required to be consistent with market participant assumptions that are reasonably available. The carrying amounts of certain of the Company’s financial instruments, which include cash equivalents, accounts receivable, prepaid expenses and other current assets, accounts payable, and accrued expenses and other current liabilities approximate their fair values due to their short maturities. The carrying value of the Company’s convertible promissory notes entered into in February 2020, which are recorded at amortized cost, approximates fair value as the stated interest rate approximates market rates for similar loans. Concentration of Credit Risk The Company’s cash, cash equivalents, marketable securities, funds held at payment processors, and accounts receivable are potentially subject to concentration of credit risk. Although the Company deposits its cash with multiple financial institutions, the deposits, at times, may exceed federally insured limits. Management believes that the institutions are financially stable and, accordingly, minimal credit risk exists. The Company limits purchases of debt securities to investment-grade securities. The Company has not experienced any significant credit losses historically. The Company relies on a limited number of third parties to provide payment processing services (“payment processors”) including collecting amounts due from end-users pre-authorizes Accounts receivable, net primarily represents receivables from merchants that were generated through the Company’s Drive offering. As of December 31, 2019, two entities individually accounted for 26% and 11% of accounts receivable, net, respectively. As of December 31, 2020, three entities individually accounted for 20%, 14%, and 10% of accounts receivable, net, respectively. No customer accounted for 10% or more of revenue for the years ended December 31, 2018, 2019, and 2020. Revenue Recognition The Company recognizes revenue in accordance with the Financial Accounting Standards Board (“FASB”) Accounting Standards Codification (“ASC”) 606, Revenue from Contracts with its Customers. per-order When determining the appropriate accounting for the fees collected in exchange for the use of the Company’s local logistics platform, the Company considered its contractual arrangements with the parties involved as well as its customary business practices. Under the Company’s agreements with partner merchants, the Company agrees to a commission to be earned as a percentage of the total dollar value of goods ordered. When a consumer signs up to use the Company’s local logistics platform, the consumer agrees to be charged certain fees, at the time an order is placed, in exchange for use of the platform. The Company has concluded that a contract exists between the Company and a partner merchant when the partner merchant accepts each consumer’s order, and a contract exists between the Company and a consumer when the consumer places the order and requests delivery services. The duration of a contract is typically equal to the time between when the order is placed and a Dasher picks up the food from the merchant. Contracts including variable consideration with partner merchants were not material for the periods presented. The Company’s local logistics platform facilitates orders between consumers and partner merchants. Separately, the Company’s platform arranges for consumers to obtain delivery service from Dashers. The Company has determined that the order facilitation service and delivery facilitation service are distinct performance obligations and has therefore considered whether it is a principal or agent separately for each of these items. The order facilitation service and the delivery facilitation service are distinct given that the consumer can benefit from each item separately. Further, the order facilitation service and delivery facilitation service are separately identifiable as the nature of the promises are to transfer the order facilitation service and delivery facilitation service individually, rather than as a combined item. Principal vs. Agent Considerations Judgment is required in determining whether the Company is the principal or the agent in transactions with partner merchants, consumers, and Dashers. As it relates to the accounting for order facilitation services and delivery facilitation services, the Company evaluated whether to present revenue on a gross versus net basis based on whether it controls each specified good or service before it is provided to the consumer in DoorDash Marketplace transactions. With respect to order facilitation services, the Company has determined it is an agent for partner merchants in facilitating the sale of products to the consumer through the DoorDash Marketplace. The consumer accesses the Company’s local logistics platform to identify merchants and places an order for merchants’ products. These orders are picked up from partner merchants and delivered to consumers by Dashers. The Company does not control the products prior to them being transferred to the consumer as it neither has the ability to redirect the products to another consumer nor does it obtain any economic benefit from the products. With respect to delivery facilitation services, the Company has determined it is acting as an agent for the consumer in facilitating the delivery of products by connecting consumers with Dashers. As the Company’s role with the delivery facilitation service is only to arrange for a delivery opportunity to be offered to prospective Dashers, it does not control how the delivery service is ultimately provided to the consumer. As the Company is an agent in facilitating the sale of products and delivery services, the Company reports revenue on a net basis, reflecting amounts collected from consumers, less amounts remitted to merchants and Dashers. Dasher payout represents the amounts paid to Dashers for deliveries, including incentives and tips, except for certain referral bonuses. From time to time, Dashers may request an earlier payment settlement in exchange for a reduction in Dasher payout. The amounts payable to merchants and Dashers are included in accrued expenses and other current liabilities on the consolidated balance sheets as payments are typically settled on a weekly basis. The Company recognizes revenue from both partner merchants and consumers for each successfully completed transaction. The Company satisfies its performance obligations to a partner merchant when there is a successful sale of the merchant’s products and meets its performance obligation to a consumer once the Dasher has picked up the products from the merchant for delivery to the consumer. DoorDash also provides value-add Gift Cards The Company sells gift cards to consumers that can be redeemed through its Marketplace. Proceeds from the sale of gift cards are deferred and recorded as contract liabilities until consumers use the card to place orders on its platform. When gift cards are redeemed, revenue is recognized on a net basis as the difference between the amounts collected from consumers less amounts remitted to merchants and Dashers. Refunds and Credits From time to time the Company issues credits or refunds to merchants and consumers to ameliorate issues that may arise with orders. The Company accounts for such refunds as variable consideration and therefore records the amount of each refund or credit issued as a reduction of revenue. Incentive Programs The Company offers incentives to attract consumers and Dashers to use its local logistics platform. Consumers typically receive credits or discounted delivery fees while Dashers typically receive cash incentives. Each of the incentives are described below: Consumer Promotions The Company uses promotions in tandem with sales and marketing spend to attract new consumers to its platform. Promotions offered to consumers are primarily recorded as a reduction of revenue and include the following: New consumer incentives: Consumer referrals: Existing consumer incentives: Dasher Incentives and Referrals The Company offers various incentives to Dashers, which are primarily recorded within Dasher payout and reduce revenue. These are offered in various forms and include: Peak pay Dasher referrals Cost of Revenue, Exclusive of Depreciation and Amortization Cost of revenue primarily consists of (i) order management costs, which include payment processing charges, net of rebates issued from payment processors, costs associated with cancelled orders, costs related to placing orders with non-partner Sales and Marketing Sales and marketing expenses primarily consist of advertising and other ancillary expenses related to merchant, consumer, and Dasher acquisition, including certain consumer referral credits and Dasher referral fees paid to the referrers to the extent they represent fair value of acquiring a new consumer or a new Dasher, brand marketing expenses, personnel-related compensation expenses for sales and marketing employees, and commissions expense including amortization of deferred contract costs, as well as allocated overhead. Advertising expenses were $81 million, $446 million, and $698 million for the years ended December 31, 2018, 2019, and 2020, respectively. Research and Development Research and development expenses primarily consist of personnel-related compensation expenses related to data analytics and the design of, product development of, and improvements to the Company’s platform, as well as expenses associated with the licensing of third-party software and allocated overhead. General and Administrative General and administrative expenses primarily consist of legal, tax, and regulatory expenses, which include litigation settlement expenses and sales and indirect taxes, personnel-related compensation expenses related to administrative employees, which include finance and accounting, human resources and legal, chargebacks associated with fraudulent credit card transactions, professional services fees, acquisition-related expenses, and allocated overhead. Depreciation and Amortization Depreciation and amortization expenses primarily consist of depreciation and amortization expenses associated with the Company’s property and equipment and intangible assets. Depreciation includes expenses associated with equipment for merchants, including equipment for merchants under finance leases, computer equipment and software, office equipment, and leasehold improvements. Amortization includes expenses associated with the Company’s capitalized software and website development costs, as well as acquired intangible assets. Depreciation and amortization are excluded from cost of revenue and operating expenses. Net Loss Per Share Attributable to Common Stockholders The Company computes net loss per common share following the two-class two-class as-converted Basic net loss per share is computed by dividing the net loss attributable to common stockholders by the weighted-average number of shares of common stock outstanding during the period, less shares subject to repurchase. The diluted net loss per share is computed by giving effect to all potentially dilutive securities outstanding for the period. For periods in which the Company reports net losses, diluted net loss per common share is the same as basic net loss per common share, because all potentially dilutive securities are anti-dilutive. Vested RSUs that have not been settled have been included in the appropriate common share class used to calculate basic net loss per share. Upon completion of the Company’s IPO, all of the Company’s outstanding shares of redeemable convertible preferred stock were automatically converted into 239 million shares of common stock and their carrying amount reclassified into stockholders’ (deficit) equity. As of December 31, 2020, there were no shares of redeemable convertible preferred stock issued and outstanding. Deferred Offering Costs Deferred offering costs, which consist of direct incremental legal, consulting, accounting, and other fees relating to the anticipated sale of the Company’s common stock in the IPO, are initially capitalized and recorded in other assets on the consolidated balance sheets. As of December 31, 2019, deferred offering costs capitalized was $5 million. After the IPO, all deferred offering costs were reclassified into stockholders’ (deficit) equity as a reduction of the IPO proceeds on the consolidated balance sheets. Leases The Company applies the guidance in Accounting Standards Update (“ASU”) No. 2016-02, non-lease right-of-use The Company determines if an arrangement is or contains a lease at inception. A contract is or contains a lease if it conveys the right to control the use of an identified asset for a period of time in exchange for consideration. The Company’s classes of assets that are leased include real estate leases and equipment leases. Operating leases consist of real estate leases and are included in operating lease ROU assets and operating lease liabilities on the Company’s consolidated balance sheets. Finance leases consist of equipment leases and are included in property and equipment, net on the Company’s consolidated balance sheets. The Company’s real estate leases are for an initial period between one The Company subleases certain portions of buildings subject to operating leases. The terms and conditions of the subleases are commensurate with the terms and conditions wi

Revenue

Revenue	9 Months Ended	12 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Revenue from Contract with Customer [Abstract]
Revenue	3. Revenue Disaggregated Revenue Information All revenue recognized during the periods presented was related to the Company’s core business, which is primarily comprised of Marketplace and Drive. Revenue by geographic area is determined based on the address of the merchant, or in the case of DashPass, the address of the consumer. Revenue by geographic area was as follows (in millions): Three Months Ended September 30, Nine Months Ended September 30, 2020 2021 2020 2021 United States $ 875 $ 1,275 $ 1,912 $ 3,577 International 4 — 4 11 Total revenue $ 879 $ 1,275 $ 1,916 $ 3,588 Contract Liabilities The timing of revenue recognition may differ from the timing of invoicing to or collections from customers. The Company’s contract liabilities balance, which is included in accrued expenses and other current liabilities on the condensed consolidated balance sheets, is primarily comprised of unredeemed gift cards, prepayments received from consumers and merchants, certain consumer credits as well as other transactions for which the revenue is recognized over time. A summary of activities related to contract liabilities for the nine months ended September 30, 2021 was as follows (in millions): Contract Beginning balance $ 108 Addition to contract liabilities 815 Reduction of contract liabilities (799 ) Ending balance $ 124 (1) Gift cards and certain consumer credits can be redeemed through the Company’s online Marketplace. When they are redeemed, revenue is recognized on a net basis as the difference between the carrying amount of the gift cards and consumer credits and the amount due to merchants and Dashers for those transactions. Therefore, the amount recognized as revenue related to the reduction of gift cards and certain consumer credits is less than the amount presented in the table above. Net revenues associated with gift cards and certain consumer credits is not tracked by the Company as it is impracticable to do so. (2) Included in the beginning balance of contract liabilities was $22 million associated with unearned prepayments received by the Company, all of which was recognized as revenue during the nine months ended September 30, 2021. (3) During the three months ended September 30, 2021, the Company recorded $36 million of gift card breakage revenue, which represented the estimate of cumulative gift card breakage through September 30, 2021 based on the Company’s accounting policy discussed in Note 2. Deferred Contract Costs Deferred contract costs represent direct and incremental costs incurred to acquire or fulfill the Company’s contracts, consisting of sales commissions and costs related to merchant onboarding, which the Company expects to recover. Deferred contract costs are amortized on a straight-line basis over the expected period of benefit, which the Company determined by considering historical attrition rates and other factors. Deferred contract costs are recorded in prepaid expenses and other current assets and other assets on the condensed consolidated balance sheets. Amortization of deferred contract costs related to sales commissions is recognized in sales and marketing expense and amortization of deferred contract costs related to merchant onboarding is recognized in cost of revenue, exclusive of depreciation and amortization in the condensed consolidated statements of operations. A summary of activities related to deferred contract costs was as follows (in millions): Nine Months Ended September 30, 2020 2021 Beginning balance $ 21 $ 43 Capitalization of deferred contract costs 21 26 Amortization of deferred contract costs (6 ) (15 ) Ending balance $ 36 $ 54 Deferred contract costs, current $ 11 $ 22 Deferred contract costs, non-current 25 32 Total deferred contract costs $ 36 $ 54 Allowance for Credit Losses The allowance for credit losses related to accounts receivable and changes for the nine months ended September 30, 2021 were as follows (in millions): Nine Months September 30, Beginning balance $ 13 Additions to the provision for expected credit losses 31 Writeoffs charged against the allowance (5 ) Ending balance $ 39	3. Revenue The following tables present the Company’s revenue disaggregated by offering and by geographical region. Revenue by offering was as follows (in millions): Year Ended December 31, 2018 2019 2020 Core business $ 282 $ 876 $ 2,886 Other revenue 9 9 — Total revenue $ 291 $ 885 $ 2,886 Core business is primarily comprised of Marketplace, which includes Pickup and DoorDash for Work, and Drive. Revenue by geographic area is determined based on the address of the merchant, or in the case of DashPass, the address of the consumer. Revenue by geographic area was as follows (in millions): Year Ended December 31, 2018 2019 2020 United States $ 282 $ 877 $ 2,875 International 9 8 11 Total revenue $ 291 $ 885 $ 2,886 Contract Liabilities The timing of revenue recognition may differ from the timing of invoicing to or collections from customers. The Company’s contract liabilities balance, which is included in accrued expenses and other current liabilities on the consolidated balance sheets, is primarily comprised of unredeemed gift cards, prepayments received from consumers for DashPass subscriptions, certain consumer credits as well as other transactions for which the revenue is recognized over time. The contract liabilities balance was $13 m Deferred Contract Costs Deferred contract costs represent direct and incremental costs incurred to acquire or fulfill the Company’s contracts, consisting of sales commissions and costs related to merchant onboarding, which the Company expects to recover. Deferred contract costs are amortized on a straight-line basis over the expected period of benefit, which the Company determined by considering historical attrition rates and other factors. Deferred contract costs are recorded in prepaid expenses and other current assets and other assets on the consolidated balance sheets. Amortization of deferred contract costs related to sales commissions is recognized in sales and marketing expense and amortization of deferred contract costs related to merchant onboarding is recognized in cost of revenue, exclusive of depreciation and amortization in the consolidated statements of operations. A summary of activities related to deferred contract costs was as follows (in millions): Year Ended December 31, 2018 2019 2020 Beginning balance $ 2 $ 6 $ 21 Capitalization of deferred contract costs 5 19 32 Amortization of deferred contract costs (1 ) (4 ) (10 ) Ending balance $ 6 $ 21 $ 43 Deferred contract costs, current $ 2 $ 4 $ 16 Deferred contract costs, non-current 4 17 27 Total deferred contract costs $ 6 $ 21 $ 43

Acquisition

Acquisition	12 Months Ended
	Dec. 31, 2020
Business Combinations [Abstract]
Acquisition	4. Acquisitions Caviar Acquisition On October 31, 2019, the Company acquired Caviar in an effort to help grow its business, advance its strategy of offering consumers differentiated merchant selection, and enable the Company to cater to even more food preferences and occasions. The acquisition has been accounted for under the acquisition method of accounting. The acquisition date fair value of the consideration transferred was $411 million, which consisted of $311 million in cash, including $1 million in seller transaction costs settled at closing, and $100 million of the Company’s Series G redeemable convertible preferred stock. The Company’s acquisition-related costs were $5 million and all costs were recorded as general and administrative expenses on the Company’s consolidated statements of operations during the period in which they were incurred. The total purchase consideration of the Caviar acquisition was allocated to the tangible and intangible assets acquired, and liabilities assumed, based upon their respective fair values as of the date of the acquisition. Management determined the fair values based on a number of factors, including a valuation from an independent third-party valuation firm. The excess of the purchase price over the net assets acquired was recorded as goodwill. Goodwill is attributable to the assembled workforce and anticipated synergies from the future growth and strategic advantages in the food delivery industry. The goodwill recorded in connection with the acquisition of Caviar is deductible for tax purposes. The following table summarizes the fair values of the assets acquired and liabilities assumed as of the acquisition date (in millions): October 31, Prepaid expenses and other current assets $ 4 Intangible assets 106 Goodwill 305 Accrued expenses and other current liabilities (3 ) Other liabilities (1 ) Total purchase price $ 411 The following table sets forth the components of identifiable intangible assets acquired (in millions) and their estimated useful lives as of the date of acquisition (in years): Estimated October 31, Existing technology 1.5 $ 45 Vendor relationships 13.0 45 Courier relationships 1.5 1 Customer relationships 3.0 9 Trade name and trademarks 3.0 6 Total acquired intangible assets $ 106 Existing technology acquired primarily consists of Caviar’s online and mobile platform for restaurant pickup and delivery orders. The estimated fair value of the existing technology and vendor relationships was determined based on the present value of the expected cash flows to be generated by each existing technology and existing vendor respectively. The Company expects to amortize the fair value of these intangible assets on a straight-line basis over their respective estimated useful lives. Included within the prepaid expenses and other current assets acquired is an indemnification asset of $3 million, which relates to a corresponding assumed liability of $3 million related to a probable and estimable legal settlement for which Square, Inc. has provided an indemnification to the Company. The amount of revenue from Caviar included in the consolidated statements of operations for the year ended December 31, 2019 was $15 million. The following unaudited pro forma results presents the combined revenue and net loss as if the Caviar acquisition had been completed on January 1, 2018, the beginning of the comparable annual reporting period. The unaudited pro forma information is based on estimates and assumptions which the Company believes are reasonable and primarily reflects adjustments for the pro forma impact of additional amortization related to the fair value of acquired intangible assets and transaction costs. The unaudited pro forma results are presented for informational purposes only and are not necessarily indicative of what the actual results of operations of the combined company would have been if the acquisition had occurred at the beginning of the periods presented, nor are they indicative of future results of operations. The unaudited pro forma results were as follows (in millions): Year Ended December 31, 2018 2019 Revenue $ 361 $ 971 Net loss (291 ) (726 ) Other Acquisitions During the year ended December 31, 2019, the Company completed the acquisition of Scotty Labs, Inc., which was accounted for under the acquisition method of accounting. The acquisition date fair value of the consideration transferred was $5 million. The total purchase consideration was allocated to the tangible and intangible assets acquired, and liabilities assumed, which primarily consisted of $4 million of intangible assets. The identifiable intangible assets acquired consisted entirely of existing technology, which has an estimated remaining useful life of 2 years as of December 31, 2019. Additionally, the Company recorded $1 million of goodwill, which represented the excess of the purchase price over the net assets acquired. In December 2020, the Company completed the acquisition of all outstanding shares of a technology manufacturing company, which was accounted for under the acquisition method of accounting. The total purchase consideration was approximately $30 million, of which $3 million was recorded in accrued expenses and other current liabilities. The total purchase consideration was allocated to the tangible and intangible assets acquired, and liabilities assumed, which primarily consisted of $22 million of intangible assets. The intangible assets acquired consisted entirely of existing technology, which has an estimated remaining useful life of 8 years as of the date of the acquisition. Additionally, the Company recorded $10 million of goodwill, which represented the excess of the purchase price over the net assets acquired. These acquisitions are not material to the Company for the periods presented and therefore, pro forma information has not been presented.

Goodwill and Intangible Assets,

Goodwill and Intangible Assets, Net	9 Months Ended	12 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Intangible Assets, Net	4. Goodwill and Intangible Assets, Net During the three and nine months ended September 30, 2021, there were no changes in the carrying amount of goodwill of $316 million. Intangible assets, net consisted of the following as of December 31, 2020 (in millions): Weighted- Gross Accumulated Net Carrying Existing technology 7.6 $ 71 $ (48 ) $ 23 Vendor relationships 11.8 45 (4 ) 41 Courier relationships 0.3 1 (1 ) — Customer relationships 1.8 9 (3 ) 6 Trade name and trademarks 1.8 6 (2 ) 4 Balance as of December 31, 2020 $ 132 $ (58 ) $ 74 Intangible assets, net consisted of the following as of September 30, 2021 (in millions): Weighted- Gross Accumulated Net Carrying Existing technology 7.2 $ 71 $ (51 ) $ 20 Vendor relationships 11.1 45 (6 ) 39 Courier relationships — 1 (1 ) — Customer relationships 1.1 9 (6 ) 3 Trade name and trademarks 1.1 6 (4 ) 2 Balance as of September 30, 2021 $ 132 $ (68 ) $ 64 Amortization expense associated with intangible assets was $15 million and $3 million for the three months ended September 30, 2020 and 2021, respectively. Amortization expense associated with intangible assets was $44 million and $10 million for the nine months ended September 30, 2020 and 2021, respectively. The estimated future amortization expense of intangible assets as of September 30, 2021 was as follows (in millions): Year Ending December 31, Amortization Remainder of 2021 $ 3 2022 10 2023 6 2024 6 2025 6 Thereafter 33 Total estimated future amortization expense $ 64	5. Goodwill and Intangible Assets, Net The changes in the carrying amount of goodwill for the periods presented were as follows (in millions): Total Balance as of December 31, 2018 $ — Acquisitions 306 Balance as of December 31, 2019 306 Acquisitions 10 Balance as of December 31, 2020 $ 316 There was no goodwill impairment during the periods presented. See Note 4 for further details of goodwill recorded. Intangible assets, net consisted of the following as of December 31, 2019 (in millions): Weighted- Gross Carrying Accumulated Net Carrying Existing technology 1.4 $ 49 $ (6 ) $ 43 Vendor relationships 12.8 45 (1 ) 44 Courier relationships 1.3 1 — 1 Customer relationships 2.8 9 — 9 Trade name and trademarks 2.8 6 — 6 Balance as of December 31, 2019 $ 110 $ (7 ) $ 103 Intangible assets, net consisted of the following as of year ended December 31, 2020 (in millions): Weighted- (in years) Gross Carrying Accumulated Net Carrying Existing technology 7.6 $ 71 $ (48 ) $ 23 Vendor relationships 11.8 45 (4 ) 41 Courier relationships 0.3 1 (1 ) — Customer relationships 1.8 9 (3 ) 6 Trade name and trademarks 1.8 6 (2 ) 4 Balance as of December 31, 2020 $ 132 $ (58 ) $ 74 As a result of the Company’s progress of integrating Caviar into its existing technology platform, the Company evaluated the remaining useful life of existing technology in February 2020 and determined there was a change in the estimated useful life of this asset that would require an acceleration of the amortization expense. The useful life of Caviar existing technology was reduced to 0.7 years at the time of the change in estimate, resulting in additional amortization expense of $15 million for the year ended December 31, 2020. Amortization expense associated with intangible assets was zero, $7 million, and $51 million for the years ended December 31, 2018 , 2019 and 2020, respectively. The estimated future amortization expense of intangible assets as of December 31, 2020 was as follows (in millions): Year Ending December 31, Amortization 2021 $ 13 2022 10 2023 6 2024 6 2025 6 Thereafter 33 Total estimated future amortization expense $ 74

Fair Value Measurements

Fair Value Measurements	9 Months Ended	12 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Fair Value Disclosures [Abstract]
Fair Value Measurements	5. Fair Value Measurements The following tables set forth the Company’s cash equivalents and marketable securities that were measured at fair value on a recurring basis by level within the fair value hierarchy (in millions): December 31, 2020 Level 1 Level 2 Level 3 Total Cash equivalents U.S. Treasury securities $ — $ 3 $ — $ 3 Short-term marketable securities Commercial paper — 76 — 76 Corporate bonds — 51 — 51 U.S. government agency securities — 23 — 23 U.S. Treasury securities — 364 — 364 Total $ — $ 517 $ — $ 517 September 30, 2021 Level 1 Level 2 Level 3 Total Cash equivalents Money market funds $ 996 $ — $ — $ 996 U.S. Treasury securities — 148 — 148 Short-term marketable securities Commercial paper — 414 — 414 Corporate bonds — 118 — 118 U.S. government agency securities — 69 — 69 U.S. Treasury securities — 698 — 698 Long-term marketable securities Corporate bonds — 158 — 158 U.S. government agency securities — 10 — 10 U.S. Treasury securities — 386 — 386 Total $ 996 $ 2,001 $ — $ 2,997 The fair value of the Company’s Level 1 financial instruments is based on quoted market prices for identical instruments in active markets. The fair value of the Company’s Level 2 fixed income securities is obtained from an independent pricing service, which may use quoted market prices for identical or comparable instruments in less active markets or model driven valuations using observable market data or inputs corroborated by observable market data. There were no Level 3 assets or liabilities as of December 31, 2020 and September 30, 2021.	6. Fair Value Measurements The following tables set forth the Company’s financial instruments that were measured at fair value on a recurring basis by level within the fair value hierarchy (in millions): December 31, 2019 Level 1 Level 2 Level 3 Total Cash equivalents Corporate bonds $ — $ 2 $ — $ 2 Short-term marketable securities Commercial paper — 8 — 8 Corporate bonds — 110 — 110 U.S. government agency securities — 43 — 43 U.S. Treasury securities — 347 — 347 Total $ — $ 510 $ — $ 510 December 31, 2020 Level 1 Level 2 Level 3 Total Cash equivalents U.S. Treasury securities $ — $ 3 $ — $ 3 Short-term marketable securities Commercial paper — 76 — 76 Corporate bonds — 51 — 51 U.S. government agency securities — 23 — 23 U.S. Treasury securities — 364 — 364 Total $ — $ 517 $ — $ 517 The fair value of the Company’s Level 1 financial instruments is based on quoted market prices for identical instruments in active markets. The fair value of the Company’s Level 2 fixed income securities is obtained from an independent pricing service, which may use quoted market prices for identical or comparable instruments in less active markets or model driven valuations using observable market data or inputs corroborated by observable market data. The forward contract that was entered into and settled during the year ended December 31, 2019 was a Level 3 financial instrument. See Note 11 for more information regarding the forward contract. There were no Level 3 assets or liabilities as of December 31, 2019 and 2020.

Balance Sheet Components

Balance Sheet Components	9 Months Ended	12 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Balance Sheet Related Disclosures [Abstract]
Balance Sheet Components	6. Balance Sheet Components Cash Equivalents and Marketable Securities The following tables summarize the cost or amortized cost, gross unrealized gain, gross unrealized loss, and fair value of the Company’s cash equivalents and marketable securities (in millions): December 31, 2020 Cost or Unrealized Estimated Gains Losses Cash equivalents U.S. Treasury securities $ 3 $ — $ — $ 3 Short-term marketable securities Commercial paper 76 — — 76 Corporate bonds 51 — — 51 U.S. government agency securities 23 — — 23 U.S. Treasury securities 364 — — 364 Total $ 517 $ — $ — $ 517 September 30, 2021 Cost or Unrealized Estimated Gains Losses Cash equivalents Money market funds $ 996 $ — $ — $ 996 U.S. Treasury securities 148 — — 148 Short-term marketable securities Commercial paper 414 — — 414 Corporate bonds 118 — — 118 U.S. government agency securities 69 — — 69 U.S. Treasury securities 698 — — 698 Long-term marketable securities Corporate bonds 158 — — 158 U.S. government agency securities 10 — — 10 U.S. Treasury securities 386 — — 386 Total $ 2,997 $ — $ — $ 2,997 No individual security incurred continuous unrealized losses for greater than twelve months as of December 31, 2020 and September 30, 2021. Property and Equipment, net Property and equipment, net consisted of the following (in millions): December 31, September 30, Equipment for merchants $ 111 $ 147 Capitalized software and website development costs 86 226 Leasehold improvements 57 83 Computer equipment and software 22 39 Office equipment 11 19 Construction in progress 27 42 Total 314 556 Less: Accumulated depreciation and amortization (104 ) (201 ) Property and equipment, net $ 210 $ 355 Depreciation expenses were $14 million and $20 million for the three months ended September 30, 2020 and 2021, respectively. Depreciation expenses were $35 million and $58 million for the nine months ended September 30, 2020 and 2021, respectively. The Company capitalized $15 million and $50 million in capitalized software and website development costs during the three months ended September 30, 2020 and 2021, respectively. The Company capitalized $38 million and $140 million in capitalized software and website development costs during the nine months ended September 30, 2020 and 2021, respectively. Capitalized software and website development costs are included in property and equipment, net on the condensed consolidated balance sheets. Amortization of capitalized software and website development costs was $5 million and $18 million for the three months ended September 30, 2020 and 2021, respectively. Amortization of capitalized software and website development costs was $10 million and $39 million for the nine months ended September 30, 2020 and 2021, respectively. Construction in progress primarily included leasehold improvements on premises that are not ready for use and equipment for merchants that are not placed in service. Accrued Expenses and Other Current Liabilities Accrued expenses and other current liabilities consisted of the following (in millions): December 31, September 30, Litigation reserves $ 178 $ 114 Sales tax payable and accrued sales and indirect taxes 149 152 Accrued operations related expenses 139 145 Dasher and merchant payable 110 177 Contract liabilities 108 124 Accrued advertising 62 172 Insurance reserves 55 123 Credits issued to consumers 28 35 Other 114 184 Total $ 943 $ 1,226	7. Balance Sheet Components Cash Equivalents and Marketable Securities The following tables summarize the cost or amortized cost, gross unrealized gain, gross unrealized loss, and fair value of the Company’s cash equivalents and marketable securities (in millions): December 31, 2019 Cost or Unrealized Estimated Gains Losses Cash equivalents Corporate bonds $ 1 $ 1 $ — $ 2 Short-term marketable securities Commercial paper 8 — — 8 Corporate bonds 110 — — 110 U.S. government agency securities 43 — — 43 U.S. Treasury securities 347 — — 347 Total $ 509 $ 1 $ — $ 510 December 31, 2020 Cost or Unrealized Estimated Gains Losses Cash equivalents U.S. Treasury securities $ 3 $ — $ — $ 3 Short-term marketable securities Commercial paper 76 — — 76 Corporate bonds 51 — — 51 U.S. government agency securities 23 — — 23 U.S. Treasury securities 364 — — 364 Total $ 517 $ — $ — $ 517 No individual security incurred continuous unrealized losses for greater than twelve months as of December 31, 2019 and 2020. Property and Equipment, net Property and equipment, net consisted of the following (in millions): December 31, December 31, Equipment for merchants $ 55 $ 111 Computer equipment and software 12 22 Capitalized software and website development costs 25 86 Leasehold improvements 31 57 Office equipment 7 11 Construction in progress 10 27 Total 140 314 Less: Accumulated depreciation and amortization (39 ) (104 ) Property and equipment, net $ 101 $ 210 Included within equipment for merchants was $4 million of assets under finance leases, which was fully amortized as of December 31, 2019. No new finance leases were entered during the year ended December 31, 2020. Depreciation expense on finance leases was not material in the periods presented. Depreciation expenses were $6 million, $20 million, and $52 million for the years ended December 31, 2018, 2019, and 2020, respectively. The Company capitalized $4 million, $15 million, and $61 million in capitalized software and website development costs during the years ended December 31, 2018, 2019, and 2020, respectively. Capitalized software and website development costs are included in property and equipment, net on the consolidated balance sheets. Amortization of capitalized software and website development costs was $3 million, $5 million, and $17 million for the years ended December 31, 2018, 2019, and 2020, respectively. Construction in progress primarily included leasehold improvements on premises that are not ready for use and equipment for merchants that are not placed in service. Accrued Expenses and Other Current Liabilities Accrued expenses and other current liabilities consisted of the following (in millions): December 31, December 31, Litigation reserves $ 99 $ 178 Sales tax payable and accrued sales and indirect taxes 51 149 Accrued operations related expenses 40 139 Accrued advertising 24 62 Dasher and merchant payable 27 110 Credits issued to consumers 14 28 Insurance reserves 15 55 Contract liabilities 13 108 Other 62 114 Total $ 345 $ 943

Leases

Leases	12 Months Ended
	Dec. 31, 2020
Leases [Abstract]
Leases	8. Leases The Company leases its facilities under non-cancelable non-cancelable Rent expense, net of sublease income, was $10 million, $29 million, and $46 million during the years ended December 31, 2018, 2019, and 2020, respectively. In June 2019, the Company subleased its previous headquarters office space to another company (the “Sublessee”). The sublease required Sublessee to pay 100% of any rent and other related expenses due and payable under the existing lease with the landlord (the “Head Lease”), however the Company was not relieved from its legal obligation to the landlord under the Head Lease. Accordingly, as of December 31, 2019, an operating lease liability and an operating lease ROU asset was reflected on the Company’s consolidated balance sheets related to the Head Lease. Prior to April 2020, all payments due and payable by Sublessee were made timely. In early April 2020, as a result of a disruption to Sublessee’s business due to the COVID-19 The components of lease costs related to the Company’s operating leases included in the consolidated statements of operations for the periods presented were as follows (in millions): Year Ended December 31, 2019 2020 Operating lease cost $ 22 $ 40 Short-term lease cost 10 11 Sublease income (3 ) (5 ) Total lease cost $ 29 $ 46 Lease terms and discount rates for operating leases were as follows: December 31, December 31, Weighted-average remaining lease term (in years) 10.2 10.7 Weighted-average discount rate 7.12 % 8.06 % Supplemental cash flow and non-cash Year Ended December 31, 2019 2020 Cash paid for amounts included in the measurement of lease liabilities Operating cash flows for operating leases $ 12 $ 32 Financing cash flows for finance leases $ 1 $ — ROU assets obtained in exchange for new lease liabilities Operating leases $ 137 $ 69 As of December 31, 2019 and 2020, the Company had entered into long term non-cancelable As of December 31, 2020, the future minimum lease payments required under operating leases were as follows (in millions): Year Ending December 31, Amount 2021 $ 36 2022 46 2023 46 2024 44 2025 42 Thereafter 319 Total future minimum lease payments 533 Less: Lease not commenced (120 ) Less: Imputed interest (145 ) Less: Tenant improvement receivable (15 ) Present value of future minimum lease payments $ 253 Future minimum sublease income as of December 31, 2020 is not material.

Promissory Notes

Promissory Notes	9 Months Ended	12 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Debt Disclosure [Abstract]
Promissory Notes	7. Promissory Notes 2020 Convertible Promissory Notes In February 2020, the Company issued convertible notes for an aggregate principal amount of $340 million with an initial maturity date in March 2025 (the “2020 Notes”). The Company received net proceeds of $333 million, net of $2 million in debt issuance costs, reflecting an original issue discount on the principal of $5 million. The interest rate is 10.00% per annum, payable quarterly in arrears. In February 2021, the Company repaid the outstanding principal and accrued interest of the 2020 Notes in full for $375 million.	9. Promissory Notes 2017 Convertible Promissory Notes In September and December 2017, the Company entered into Note Purchase Agreements pursuant to which the Company issued convertible promissory notes with an aggregate principal amount of $60 million (the “Notes”) to two existing investors and one new investor. The Notes accrued interest at the rate of 1.29% per annum. The Notes could be redeemed or converted into redeemable convertible preferred stock upon either, (i) a change in control, or (ii) an equity financing of at least $50 million. The Notes could also be accelerated upon the occurrence of a customary event of default. In 2018, the Company issued Series D redeemable convertible preferred stock, thereby satisfying the Notes’ conversion condition. As a result, the outstanding principal and accrued interest of $60 million converted into a total of 11,752,210 shares of Series D redeemable convertible preferred stock, which were converted into Class A common stock upon the Company’s IPO. Promissory Note Issued to Not-for-Profit In October 2019, the Company entered into a $30 million promissory note (the “Promissory Note”) with a third-party not-for-profit not-for-profit not-for-profit 2020 Convertible Promissory Notes In February 2020, the Company issued convertible notes for an aggregate principal amount of $340 million with an initial maturity date in March 2025 (the “2020 Notes”). The Company received net proceeds of $333 million, net of $2 million in debt issuance costs, reflecting an original issue discount on the principal of $5 million. The interest rate is 10.00% per annum, payable quarterly in arrears. At the election of the Company, interest is to be paid in cash or by increasing the principal amount of the 2020 Notes by payment-in-kind. one-year non-convertible 40-trading As of December 31, 2020, the 2020 Notes had a carrying value of $364 million on the consolidated balance sheets, consisting of the unpaid principal balance of $340 million, plus unpaid accrued payment-in-kind

Commitments and Contingencies

Commitments and Contingencies	9 Months Ended	12 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	8. Commitments and Contingencies Legal Proceedings From time to time, the Company may be a party to litigation and subject to claims incidental to its business. Although the results of litigation and claims cannot be predicted with certainty, the Company currently believes that the final outcome of these matters will not have a material adverse effect on its business. Regardless of the outcome, litigation can have an adverse impact on the Company because of judgment, defense and settlement costs, diversion of management resources, and other factors. At each reporting period, the Company evaluates whether or not a potential loss amount or a potential range of loss is probable and reasonably estimable, requiring recognition of a loss accrual, or whether the potential loss is reasonably possible, requiring potential disclosure. Legal fees are expensed as incurred. The Company has been and continues to be involved in numerous legal proceedings related to Dasher classification, and such proceedings have increased in volume since the California Supreme Court’s 2018 ruling in Dynamex Operations West, Inc. v. Superior Court . The Company is currently the subject of regulatory and administrative investigations, audits, and inquiries conducted by federal, state, or local governmental agencies concerning the Company’s business practices, the classification and compensation of delivery providers, the Dasher pay model, and other matters. For example, we are currently under audit by the Employment Development Department, State of California for payroll tax liabilities. The Company believes that Dashers are, and have been, properly classified as independent contractors, and thus plans to vigorously contest any adverse assessment or determination. The Company’s chances of success on the merits is uncertain. In October 2019, the Company made an offer, and in November 2019 it filed a settlement agreement, of $40 million with the representatives of Dashers that had filed actions in the States of California and Massachusetts in order to settle claims under the Private Attorney General Act and class action claims alleging worker misclassification of Dashers against the Company. These actions were filed by and on behalf of Massachusetts Dashers that utilized the DoorDash platform since September 2014 and California Dashers that utilized the DoorDash platform since August 2016. On June 8, 2020, the Company entered into an amended settlement agreement to increase the total amount to be paid by the Company from $40 million to $41 million. In October 2020, the Company entered into an amended settlement agreement to increase the total amount to be paid by the Company from $41 million to $89 million. In April 2021, the Company entered into an amended settlement agreement increasing the total amount to be paid by the Company to $100 million. In March 2020, the Company reached an agreement to resolve worker misclassification claims associated with certain Dashers and Caviar delivery providers who have entered into arbitration agreements with the Company. Under the agreement, certain Dashers and Caviar delivery providers are eligible for settlement payments, subject to a threshold number of the covered individuals entering into individual settlement agreements. The Company anticipated that the aggregate amount of payments to Dashers and Caviar delivery providers under these individual settlement agreements, including attorneys’ fees, would be approximately $70 million. In July 2020, the Company transferred $69 million into an escrow account, the settlement amount to be released and paid to claimants and claimants’ attorneys if a minimum number of claimants agreed to release their claims against the Company by the date specified within the settlement agreement. In December 2020, the number of claimants who agreed to release their claims against the Company exceeded the minimum, and the Company committed to release the settlement amount in the escrow account to claimants and claimants’ attorneys. In the nine months ended September 30, 2021, the $69 million in the escrow account was fully distributed to the claimants and claimants’ attorneys. In July and August 2020, the Company reached additional agreements to resolve worker misclassification claims associated with certain Dashers and Caviar delivery providers who have entered into arbitration agreements with the Company. Under these agreements, certain Dashers and Caviar delivery providers are eligible for settlement payments, subject to a threshold number of the covered individuals entering into individual settlement agreements. The Company anticipates that the aggregate amount of payments to Dashers and Caviar delivery providers under these individual settlement agreements, including attorneys’ fees, will be approximately $14 million, of which $11 million was paid in the nine months ended September 30, 2021. In June 2020, the San Francisco District Attorney filed an action in the Superior Court of California, County of San Francisco, alleging that the Company misclassified Dashers as independent contractors as opposed to employees in violation of the California Labor Code and the California Unfair Competition Law, among other allegations. This action is seeking both restitutionary damages and a permanent injunction that would bar the Company from continuing to classify Dashers as independent contractors. In August 2020, the San Francisco District Attorney filed a motion for preliminary injunction that would bar the Company from continuing to classify Dashers in California as independent contractors during the pendency of this case. In December 2020, the San Francisco District Attorney withdrew its request for preliminary injunction. It is a reasonable possibility that a loss may be incurred; however, the possible range of losses is not estimable given the status of the case. Indemnification The Company enters into standard indemnification arrangements in the ordinary course of business. Pursuant to these arrangements, the Company indemnifies, holds harmless, and agrees to reimburse the indemnified parties for losses suffered or incurred by the indemnified party, in connection with any trade secret, copyright, patent, or other intellectual property infringement claim by any third-party with respect to its technology. The terms of these indemnification agreements are generally perpetual any time after the execution of the agreement. The maximum potential amount of future payments the Company could be required to make under these agreements is not determinable because it involves claims that may be made against the Company in the future, but have not yet been made. The Company has not incurred costs to defend lawsuits or settle claims related to these indemnification agreements. The Company has entered into or will enter into indemnification agreements with its directors and officers that may require the Company to indemnify its directors and officers against liabilities that may arise by reason of their status or service as directors or officers, other than liabilities arising from willful misconduct of the individual. No liability associated with such indemnifications was recorded as of December 31, 2020 and September 30, 2021. Bank Commitments and Letters of Credit In November 2019, the Company entered into a revolving credit and guaranty agreement which provides for a $300 million unsecured revolving credit facility maturing on November 19, 2024. Loans under the credit facility bear interest, at the Company’s option, at (i) a base rate equal to the highest of (A) the prime rate, (B) the higher of the federal funds rate or a composite overnight bank borrowing rate plus 0.50%, or (C) an adjusted LIBOR rate for a one-month In August 2020, the Company amended and restated its existing revolving credit and guaranty agreement to provide for $100 million of incremental revolving loan commitments, effective upon the consummation of an initial public offering of the Company’s common stock on or prior to August 7, 2021, for total revolving commitments of $400 million. The amendment and restatement also extended the maturity date for the revolving credit facility from November 19, 2024 to August 7, 2025. As of December 31, 2020 and September 30, 2021, the Company was in compliance with the covenants under the credit agreement. As of December 31, 2020 and September 30, 2021, no amounts were drawn and the Company had $44 million and $39 million of issued letters of credit outstanding from the revolving credit and guaranty agreement. Sales and Indirect Tax Matters The Company is under audit by various state and local tax authorities with regard to sales and indirect tax matters. The Company records sales and indirect tax reserves when they become probable and the amount can be reasonably estimated. These reserves are included in accrued expenses and other current liabilities on the condensed consolidated balance sheets. The timing of the resolution of indirect tax examinations is highly uncertain, and the amounts ultimately paid, if any, upon resolution of the issues raised by the tax authorities may differ from the amounts accrued. It is reasonably possible that within the next twelve months the Company will receive additional assessments by various tax authorities in one or more jurisdictions. These assessments could result in changes to the Company’s reserves related to positions on sales and indirect tax filings. In the nine months ended September 30, 2021, the Company favorably resolved a sales and indirect tax exposure resulting in a $29 million reduction of liabilities previously reserved.	10. Commitments and Contingencies Legal Proceedings From time to time, the Company may be a party to litigation and subject to claims incidental to its business. Although the results of litigation and claims cannot be predicted with certainty, the Company currently believes that the final outcome of these matters will not have a material adverse effect on its business. Regardless of the outcome, litigation can have an adverse impact on the Company because of judgment, defense and settlement costs, diversion of management resources, and other factors. At each reporting period, the Company evaluates whether or not a potential loss amount or a potential range of loss is probable and reasonably estimable, requiring recognition of a loss accrual, or whether the potential loss is reasonably possible, requiring potential disclosure. Legal fees are expensed as incurred. The Company has been and continues to be involved in numerous legal proceedings related to Dasher classification, and such proceedings have increased in volume since the California Supreme Court’s 2018 ruling in Dynamex Operations West, Inc. v. Superior Court . On November 19, 2019, the District of Columbia filed an action in the Superior Court of the District of Columbia alleging violations of the District of Columbia’s Consumer Protection Procedures Act with respect to the Company’s Dasher pay model that was in effect from approximately September 2017 through September 2019. On November 24, 2020, the Company agreed to a Consent Order and Judgment that resolved the matter with the Company paying $3 million. The Consent Order and Judgment was signed by the Court on November 30, 2020. The Company recorded a $3 million expense in the consolidated statements of operations within general and administrative expense during the year ended December 31, 2020 for this case. The Company is currently the subject of regulatory and administrative investigations, audits, and inquiries conducted by federal, state, or local governmental agencies concerning the Company’s business practices, the classification and compensation of delivery providers, the Dasher pay model, and other matters. In October 2019, the Company made an offer, and in December 2019 it filed a settlement agreement, of $40 million with the representatives of Dashers that had filed actions in the States of California and Massachusetts in order to settle claims under the Private Attorney General Act and class action claims alleging worker misclassification of Dashers against the Company. These actions were filed by and on behalf of Massachusetts Dashers that utilized the DoorDash platform since September 2014 and California Dashers that utilized the DoorDash platform since August 2016. On June 8, 2020, the Company entered into an amended settlement agreement to increase the total amount to be paid by the Company from $40 million to $41 million. In October 2020, the Company entered into an amended settlement agreement to increase the total amount to be paid by the Company from $41 million to $89 million. In March 2020, the Company reached an agreement to resolve worker misclassification claims associated with certain Dashers and Caviar delivery providers who have entered into arbitration agreements with the Company. Under the agreement, certain Dashers and Caviar delivery providers are eligible for settlement payments, subject to a threshold number of the covered individuals entering into individual settlement agreements. The Company anticipates that the aggregate amount of payments to Dashers and Caviar delivery providers under these individual settlement agreements, including attorneys’ fees, will be approximately $70 million. In July 2020, the Company transferred $69 million into an escrow account, the settlement amount will be released and paid to claimants and claimants’ attorneys if a minimum number of claimants agree to release their claims against the Company by the date specified within the settlement agreement. In December 2020, the number of claimants who agreed to release their claims against the Company exceeded the minimum and the Company is committed to release the settlement amount in the escrow account to claimants and claimants’ attorneys in the first quarter of 2021. As of December 31, 2020, the settlement amount was included in prepaid expenses and other current assets on the consolidated balance sheets. In July and August 2020, the Company reached additional agreements to resolve worker misclassification claims associated with certain Dashers and Caviar delivery providers who have entered into arbitration agreements with the Company. Under these agreements, certain Dashers and Caviar delivery providers are eligible for settlement payments, subject to a threshold number of the covered individuals entering into individual settlement agreements. The Company anticipates that the aggregate amount of payments to Dashers and Caviar delivery providers under these individual settlement agreements, including attorneys’ fees, will be approximately $16 million. The Company recorded the impact of these worker misclassification settlements in the respective period in which the claims relate, resulting in general and administrative expense of $11 million, $68 million, and $83 million for the years ended December 31, 2018, 2019, and 2020, respectively. In June 2020, the San Francisco District Attorney filed an action in the Superior Court of California, County of San Francisco, alleging that the Company misclassified Dashers as independent contractors as opposed to employees in violation of the California Labor Code and the California Unfair Competition Law, among other allegations. This action is seeking both restitutionary damages and a permanent injunction that would bar the Company from continuing to classify Dashers as independent contractors. In August 2020, the San Francisco District Attorney filed a motion for preliminary injunction that would bar the Company from continuing to classify Dashers in California as independent contractors during the pendency of this case. In December 2020, the San Francisco District Attorney withdrew its request for preliminary injunction. It is a reasonable possibility that a loss may be incurred; however, the possible range of losses is not estimable given the status of the case. Indemnification The Company enters into standard indemnification arrangements in the ordinary course of business. Pursuant to these arrangements, the Company indemnifies, holds harmless, and agrees to reimburse the indemnified parties for losses suffered or incurred by the indemnified party, in connection with any trade secret, copyright, patent, or other intellectual property infringement claim by any third-party with respect to its technology. The terms of these indemnification agreements are generally perpetual any time after the execution of the agreement. The maximum potential amount of future payments the Company could be required to make under these agreements is not determinable because it involves claims that may be made against the Company in the future, but have not yet been made. The Company has not incurred costs to defend lawsuits or settle claims related to these indemnification agreements. The Company has entered into or will enter into indemnification agreements with its directors and officers that may require the Company to indemnify its directors and officers against liabilities that may arise by reason of their status or service as directors or officers, other than liabilities arising from willful misconduct of the individual. No liability associated with such indemnifications was recorded as of December 31, 2019 and 2020. Non-cancelable The Company has non-cancelable non-cancelable Year Ending December 31, Amount 2021 $ 119 2022 112 2023 104 2024 79 2025 2 Total future minimum payments $ 416 Bank Commitments and Letters of Credit In October 2019, the Company entered into letters of credit, established primarily for real estate leases and insurance policies. The reimbursement obligations under these letters of credit are secured by cash held in restricted depository accounts. As of December 31, 2019 the Company had $30 million of letters of credit outstanding. During the year ended December 31, 2020, the Company terminated these letters of credit. Additionally, in November 2019, the Company entered into a revolving credit and guaranty agreement which provides for a $300 million unsecured revolving credit facility maturing on November 19, 2024. Loans under the credit facility bear interest, at the Company’s option, at (i) a base rate equal to the highest of (A) the prime rate, (B) the higher of the federal funds rate or a composite overnight bank borrowing rate plus 0.50%, or (C) an adjusted LIBOR rate for a one-month In August 2020, the Company amended and restated its existing revolving credit and guaranty agreement to provide for $100 million of incremental revolving loan commitments, effective upon consummation of an IPO of the Company’s common stock on or prior to August 7, 2021, for total revolving commitments of $400 million. The amendment and restatement also extended the maturity date for the revolving credit facility from November 19, 2024 to August 7, 2025. As of December 31, 2019 and 2020, the Company was in compliance with the covenants under the credit agreement. As of December 31, 2019, there were no amounts drawn related to this agreement. As of December 31, 2020, no amounts were drawn and the Company had $44 million of issued letters of credit outstanding from the revolving credit and guaranty agreement.

Redeemable Convertible Preferre

Redeemable Convertible Preferred Stock	12 Months Ended
	Dec. 31, 2020
Temporary Equity Disclosure [Abstract]
Redeemable Convertible Preferred Stock	11. Redeemable Convertible Preferred Stock In June 2020, the Company entered into a Series H redeemable convertible preferred stock purchase agreement pursuant to which it issued a total of 8,321,395 shares of Series H redeemable convertible preferred stock at $45.9062 per share for gross proceeds of $382 million. The preferred stock issuance costs were not material. The Company previously issued Series A-1, The following table summarizes the redeemable convertible preferred stock outstanding immediately prior to the conversion into common stock, and the rights and preferences of the Company’s respective series preceding the Company’s IPO in December 2020 (in millions, except share amounts which are reflected in thousands, and per share data): Series Shares Shares Issuance Price Per Share Aggregate Carrying Series A-1 13,330 13,330 $ 0.15 $ 0.15 $ 2 $ 7 Series A 27,159 27,159 0.73 0.73 20 20 Series B 7,925 7,925 5.68 5.48 45 45 Series C 26,839 26,839 4.79 4.79 128 128 Series D 98,008 98,008 5.51 (1) 5.51 540 535 Series E 18,055 18,055 13.85 13.85 250 250 Series F 18,186 18,186 22.48 22.48 409 476 Series G 21,165 21,165 37.94 37.94 803 803 Series H 9,351 8,316 45.91 45.91 382 382 Total 240,018 238,983 $ 2,579 $ 2,646 (1) The issuance price for Series D redeemable convertible preferred stock was $5.50688, except for shares issued via the conversion of certain of the outstanding convertible promissory notes issued in 2017, for which the conversion price was $4.78778 per share. Forward Contract In Connection Series In February 2019, the Company issued a total of 13,736,615 shares of Series F redeemable convertible preferred stock at $22.4751 per share for gross proceeds of $309 million. To accommodate the timing of regulatory approvals required by an existing investor (who did not participate in the initial issuance of Series F redeemable convertible preferred stock), the Company committed to sell 4,449,370 shares of Series F redeemable convertible preferred stock at $22.4751 per share for gross proceeds of $100 million to this investor in a subsequent closing, which ultimately occurred in May 2019. The preferred stock issuance costs were not material. At the date of the initial closing, the Company determined that the commitment to defer the sale of shares of Series F redeemable convertible preferred stock to this investor represented a freestanding instrument that should be classified as a liability and measured at fair value on a recurring basis, with changes in fair value recognized in other expense, net in the consolidated statements of operations. The initial measurement of the liability at its fair value of $1 million was recorded with a corresponding reduction recognized in additional paid-in The fair value of the liability (valued as a forward contract) at issuance and as of subsequent closing was determined with the following assumptions: As of As of Current forward price per share $ 22.48 $ 37.76 Contractual forward price per share $ 22.48 $ 22.48 Risk-free rate 2.46 % 2.41 % Expected years until subsequent closing 0.23 — Present value of contractual forward price per share $ 22.35 $ 22.48 Value of the forward contract per share $ 0.13 $ 15.28 Number of preferred shares issued in the subsequent closing 4,449,370 4,449,370 Fair value of forward contract liability (in millions) $ 1 $ 68 As of December 31, 2020, there was no preferred stock issued and outstanding.

Common Stock

Common Stock	9 Months Ended	12 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Equity [Abstract]
Common Stock	9. Common Stock 2014 Equity Incentive Plan In March 2014, the Company adopted the 2014 Stock Option Plan, as amended, or the 2014 Plan, which provided for the granting of stock options to employees, consultants, and advisors of the Company. Options granted under the 2014 Plan are either incentive stock options or nonqualified stock options. Options under the 2014 Plan were granted at prices no less than 100% of the estimated fair value of the shares on the date of grant as determined by the Company’s board of directors; provided, however, that the exercise price of an incentive stock option granted to a greater than 10% stockholder could not be less than 110% of the estimated fair value of the shares on the date of grant. Options granted generally vest over four years. The 2014 Plan allowed for the early exercise of options. Under the terms of the 2014 Plan, option holders, upon early exercise, were required to sign a restricted stock purchase agreement that gave the Company the right to repurchase any unvested shares, at the original exercise price, in the event the grantees’ employment terminated for any reason. The repurchase right lapses over time as the shares vest at the same rate as the original option vesting schedule. Stock-based awards forfeited, cancelled, or repurchased generally were returned to the pool of shares of common stock available for issuance. In connection with the Company’s initial public offering (the “IPO”), the 2014 Plan was terminated effective immediately prior to the effectiveness of the 2020 Equity Incentive Plan (“2020 Plan”) and the Company ceased granting any additional awards under the 2014 Plan. All outstanding awards under the 2014 Plan at the time of the termination of the 2014 Plan remain subject to the terms of the 2014 Plan, and any shares underlying stock options that expire or terminate or are forfeited or repurchased by the Company under the 2014 Plan were automatically transferred to the 2020 Plan. 2020 Equity Incentive Plan In November 2020, the Company’s board of directors adopted, and the Company’s stockholders approved, the 2020 Plan, which became effective one business day prior to the effective date of the IPO Registration Statement. The 2020 Plan provides for the granting of nonstatutory stock options, restricted stock, restricted stock units (“RSUs”), stock appreciation rights, performance units, and performance shares for the Company’s Class A common stock to the Company’s employees, directors, and consultants. Stock-based awards under the 2020 Plan that expire or are forfeited, canceled, or repurchased generally are returned to the pool of shares of Class A common stock available for issuance under the 2020 Plan. In addition, the number of shares of the Company’s Class A common stock reserved for issuance under the 2020 Plan will automatically increase on January 1 of each calendar year, starting on January 1, 2021 in an amount equal to the least of (i) 32,493,000 shares, (ii) five percent (5%) of the total number of all classes of common stock outstanding on December 31 of the fiscal year before the date of each automatic increase, or (iii) such other number of shares determined by the Company’s board of directors prior to the applicable January 1. The exercise price of the options granted under the 2020 Plan will at least be equal to the fair market value of the Company’s Class A common stock on the date of grant. The options may be granted for a term of up to ten years (or five years if the option is an incentive stock option granted to a greater than 10% stockholder) and at prices no less than 100% of the fair market value of the shares on the date of grant, provided, however, that the exercise price of an incentive stock option granted to a greater than 10% stockholder shall not be less than 110% of the estimated fair value of the shares on the date of grant. Options granted under the 2020 Plan generally vest over four years. Stock Award Activities A summary of activity under the 2014 and 2020 Plan and related information was as follows (in millions, except share amounts which are reflected in thousands, and per share data): Options Outstanding Shares Weighted- Weighted- Aggregate Balance as of December 31, 2020 33,802 $ 2.42 5.92 $ 4,744 Granted — $ — Exercised (12,346 ) $ 2.27 $ 1,880 Forfeited (28 ) $ 2.98 Balance as of September 30, 2021 21,428 $ 2.51 4.87 $ 4,359 Exercisable as of September 30, 2021 19,231 $ 2.07 4.64 $ 3,921 Vested and expected to vest as of September 30, 2021 21,428 $ 2.51 4.87 $ 4,359 The aggregate intrinsic value disclosed in the above table is based on the difference between the exercise price of the stock option and the closing stock price on the NYSE as of the respective period-end The summary of RSU activity was as follows (in millions, except share amounts which are reflected in thousands, and per share data): Number of Weighted- Aggregate Unvested units as of December 31, 2020 28,366 $ 4,049 Granted 6,545 $ 166.87 Vested (47 ) $ 105.26 Vested and settled (5,852 ) $ 50.34 Forfeited (909 ) $ 72.89 Unvested units as of September 30, 2021 28,103 $ 5,789 The aggregate intrinsic value disclosed in the above table is based on the closing price on the NYSE, as of the respective period-end Stock-Based Compensation Expense The Company recorded stock-based compensation expense in the condensed consolidated statements of operations as follows (in millions): Three Months Ended Nine Months Ended 2020 2021 2020 2021 Cost of revenue, exclusive of depreciation and amortization $ — $ 13 $ 1 $ 34 Sales and marketing — 14 1 38 Research and development 2 47 5 129 General and administrative 1 48 4 156 Total stock-based compensation expense $ 3 $ 122 $ 11 $ 357 As of September 30, 2021, there was $9 million of unrecognized stock-based compensation expense related to unvested stock options, which is expected to be recognized over a weighted-average period of 0.80 years. In November 2020, the Company’s board of directors approved the grant of 10,379,000 RSUs to the Company’s Chief Executive Officer (the “CEO Performance Award”). The CEO Performance Award vests upon the satisfaction of a service condition and achievement of certain stock price goals. As of September 30, 2021, unrecognized stock-based compensation expense related to the CEO Performance Award was $318 million, which is expected to be recognized over a period of 3.57 years. As of September 30, 2021, there was $1.4 billion of unrecognized stock-based compensation expense related to unvested RSUs, excluding the unrecognized stock-based compensation expense associated with the CEO Performance Award granted in November 2020. The Company expects to recognize this expense over the remaining weighted-average period of 2.68 years. 2020 Employee Stock Purchase Plan In November 2020, the Company’s board of directors adopted, and the Company’s stockholders approved, the 2020 Employee Stock Purchase Plan (“the ESPP”), which became effective on the business day immediately prior to the effectiveness of the registration statement on Form S-1 one-half Subject to any limitations contained therein, the ESPP allows eligible employees to contribute (in the form of payroll deductions or otherwise to the extent permitted by the administrator) an amount established by the administrator from time to time in its discretion to purchase Class A common stock at a discounted price per share. As of September 30, 2021, there had been no offering period or purchase period under the ESPP, and no such period will begin unless and until determined by the administrator.	12. Common Stock Common Stock Reserved for Future Issuance The following table summarizes the Company’s shares of common stock reserved for future issuance on an as-converted December 31, December 31, Conversion of outstanding redeemable convertible preferred stock 230,953 — Stock options issued and outstanding under the 2014 Plan 36,247 33,802 RSUs outstanding under the 2014 and 2020 Plan 15,924 34,939 Remaining shares available for future issuance 10,478 32,210 Shares available for issuance under the 2020 Employee Stock Purchase Plan — 6,499 Total 293,602 107,450 2014 Equity Incentive Plan In March 2014, the Company adopted the 2014 Stock Option Plan, as amended, or the 2014 Plan, which provided for the granting of stock options to employees, consultants, and advisors of the Company. Options granted under the 2014 Plan are either incentive stock options or nonqualified stock options. Options under the 2014 Plan were granted for a term of up to ten years (or five years if the option was an incentive stock option granted to a greater than 10% stockholder) and at prices no less than 100% of the estimated fair value of the shares on the date of grant as determined by the Company’s board of directors; provided, however, that the exercise price of an incentive stock option granted to a greater than 10% stockholder could not be less than 110% of the estimated fair value of the shares on the date of grant. Options granted generally vest over four years. The 2014 Plan allowed for the early exercise of options. Under the terms of the 2014 Plan, option holders, upon early exercise, were required to sign a restricted stock purchase agreement that gave the Company the right to repurchase any unvested shares, at the original exercise price, in the event the grantees’ employment terminated for any reason. The repurchase right lapses over time as the shares vest at the same rate as the original option vesting schedule. Stock-based awards forfeited, cancelled, or repurchased generally were returned to the pool of shares of common stock available for issuance. In connection with the IPO, the 2014 Plan was terminated effective immediately prior to the effectiveness of the 2020 Equity Incentive Plan (“2020 Plan”) and the Company ceased granting any additional awards under the 2014 Plan. All outstanding awards under the 2014 Plan at the time of the termination of the 2014 Plan remain subject to the terms of the 2014 Plan, and any shares underlying stock options that expire or terminate or are forfeited or repurchased by the Company under the 2014 Plan were automatically transferred to the 2020 Plan. 2020 Equity Incentive Plan In November 2020, the Company’s board of directors adopted, and the Company’s stockholders approved, the 2020 Plan, which became effective one business day prior to the effective date of the IPO Registration Statement. The 2020 Plan provides for the granting of nonstatutory stock options, restricted stock, RSUs, stock appreciation rights, performance units, and performance shares for the Company’s Class A common stock to the Company’s employees, directors, and consultants. Stock-based awards under the 2020 Plan that expire or are forfeited, canceled, or repurchased generally are returned to the pool of shares of Class A common stock available for issuance under the 2020 Plan. In addition, the number of shares of the Company’s Class A common stock reserved for issuance under the 2020 Plan will automatically increase on January 1 of each calendar year, starting on January 1, 2021 in an amount equal to the least of (i) 32,493,000 shares, (ii) five percent (5%) of the total number of all classes of common stock outstanding on December 31 of the fiscal year before the date of each automatic increase, or (iii) such other number of shares determined by the Company’s board of directors prior to the applicable January 1. The exercise price of the options granted under the 2020 Plan will at least be equal to the fair market value of our Class A common stock on the date of grant. The options may be granted for a term of up to ten years (or five years if the option is an incentive stock option granted to a greater than 10% stockholder) and at prices no less than 100% of the fair market value of the shares on the date of grant, provided, however, that the exercise price of an incentive stock option granted to a greater than 10% stockholder shall not be less than 110% of the estimated fair value of the shares on the date of grant. Options granted under the 2020 Plan generally vest over four years. RSUs Prior to November 2020 , CEO Performance Award In November 2020, the Company’s board of directors approved the grant of 10,379,000 RSUs to the CEO (the “CEO Performance Award”). The CEO Performance Award vests upon the satisfaction of a service condition and achievement of certain stock price goals. The CEO Performance Award is excluded from Class A common stock issued and outstanding until the satisfaction of these vesting conditions. The CEO Performance Award also provides the holder with certain stockholder rights, such as the right to vote the shares with the other holders of Class A common stock and a right to cumulative declared dividends. However, the CEO Performance Award is not considered a participating security for purposes of calculating net loss per share attributable to common stockholders as the right to the cumulative declared dividends is forfeitable if the service condition is not met. The CEO Performance Award is eligible to vest beginning on the first trading day 18 months following the day Company’s IPO date, and expiring seven years after the IPO date. The CEO Performance Award comprises nine tranches that are eligible to vest based on the achievement of stock price goals, ranging from $187.60 to $501.00 per share, each of which are referred to as a Company Stock Price Target, measured over a consecutive 180-day Company Stock Number of RSUs 1 $ 187.60 518,950 2 $ 226.80 518,950 3 $ 265.80 1,037,900 4 $ 305.00 1,037,900 5 $ 344.00 1,037,900 6 $ 383.00 1,556,850 7 $ 422.20 1,556,850 8 $ 461.20 1,556,850 9 $ 501.00 1,556,850 The Company calculated the grant date fair value of the CEO Performance Award based on multiple stock price paths developed through the use of a Monte Carlo simulation model. A Monte Carlo simulation model also calculates a derived service period for each of the nine vesting tranches, which is the measure of the expected time to achieve each Company Stock Price Target. A Monte Carlo simulation model requires the use of various assumptions, including the underlying stock price, volatility, and the risk-free interest rate as of the valuation date, corresponding to the length of time remaining in the performance period, and expected dividend yield. The weighted-average grant date fair value of the CEO Performance Award was $39.8275 per share. The Company will recognize total stock-based compensation expense of $413 million over the derived service period of each tranche, which is between 2.53 to 4.42 years, using the accelerated attribution method as long as the CEO satisfies the service-based vesting condition. If the Company Stock Price Targets are met sooner than the derived service period, the Company will adjust its stock-based compensation to reflect the cumulative expense associated with the vested awards. Provided that Tony Xu continues to be the Company’s CEO, the Company will recognize stock-based compensation expense over the requisite service period, regardless of whether the Company Stock Price Targets are achieved. The Company recorded $12 million of stock-based compensation expense related to the CEO Performance Award during the year ended December 31, 2020. As of December 31, 2020, unrecognized stock-based compensation expense related to the CEO Performance Award was $401 million. Stock Award Activities A summary of activity under the 2014 and 2020 Plan and related information was as follows (in millions, except share amounts which are reflected in thousands, and per share data): Options Outstanding Shares Shares Weighted- Weighted- Aggregate Balance as of December 31, 2019 10,478 36,247 $ 2.38 6.92 $ 1,070 Shares authorized 40,493 — Options granted — — $ — Options exercised — (2,191 ) $ 1.90 129 Options forfeited 254 (254 ) $ 1.94 RSUs granted (20,126 ) — RSUs forfeited 1,046 — Shares withheld related to net share settlement, returned to the 2020 Plan 65 Balance as of December 31, 2020 32,210 33,802 $ 2.42 5.92 $ 4,744 Exercisable as of December 31, 2020 28,291 $ 1.95 5.61 $ 3,983 Vested and expected to vest as of December 31, 2020 33,802 $ 2.42 5.92 $ 4,744 The aggregate intrinsic value disclosed in the above table is based on the difference between the exercise price of the stock option and the estimated fair value of the Company’s common stock as of the respective period-end The summary of RSU activity was as follows (in millions, except share amounts which are reflected in thousands, and per share data): Number of Weighted- Aggregate Unvested units as of December 31, 2019 15,924 $ 508 Granted 20,126 $ 56.27 Vested (6,573 ) $ 17.40 Vested and settled (65 ) $ 10.68 Forfeited (1,046 ) $ 29.14 Unvested units as of December 31, 2020 28,366 $ 4,049 The aggregate intrinsic value disclosed in the above table is based on the estimated fair value of the Company’s common stock, or after the IPO, based on the closing price on the NYSE, as of the respective period-end Early Exercise of Unvested Stock Options Shares purchased by employees pursuant to the early exercise of stock options are not deemed, for accounting purposes, to be outstanding shares until those shares vest according to their respective vesting schedules. Cash received from employee exercises of unvested options is treated as a refundable deposit included in accrued expenses and other current liabilities on the consolidated balance sheets. Amounts recorded are reclassified to common stock and additional paid-in Stock-Based Compensation Expense The assumptions used to estimate the fair value of stock options granted for the periods presented were as follows: Year Ended December 31, 2018 2019 2020 Expected volatility 54.10% - 57.64% 53.73% - 53.85% — Risk-free rate 2.49% - 3.08% 2.35% - 2.36% — Dividend yield — — — Expected term (in years) 5.00 - 6.10 5.91 - 6.03 — There were no stock options granted during the year ended December 31, 2020. The Company recorded stock-based compensation expense in the consolidated statements of operations as follows (in millions): Year Ended December 31, 2018 2019 2020 Cost of revenue, exclusive of depreciation and amortization $ 3 $ 2 $ 31 Sales and marketing 3 2 37 Research and development 11 8 171 General and administrative 7 6 83 Total stock-based compensation expense $ 24 $ 18 $ 322 As of December 31, 2020, there was $20 million of unrecognized stock-based compensation expense related to unvested stock options, which is expected to be recognized over a weighted-average period of 1.31 years. As of December 31, 2020, there was $710 million of unrecognized stock-based compensation expense related to unvested RSUs, excluding the unrecognized stock-based compensation expense associated with the CEO Performance Award granted in November 2020. The Company expects to recognize this expense over the remaining weighted-average period of 2.91 years. 2020 Employee Stock Purchase Plan The Company’s board of directors adopted, and the Company’s stockholders approved, the 2020 Employee Stock Purchase Plan (“the ESPP”), which became effective on the business day immediately prior to the effectiveness of the registration statement on Form S-1 6,498,600 shares of Class A common stock, (ii) one and one-half The ESPP includes two components: a component that allows the Company to make offerings intended to qualify under Section 423 of the Code and a component that allows the Company to make offerings not intended to qualify under Section 423 of the Code to designated companies. Subject to any limitations contained therein, the ESPP allows eligible employees to contribute (in the form of payroll deductions or otherwise to the extent permitted by the administrator) an amount established by the administrator from time to time in its discretion to purchase Class A common stock at a discounted price per share. As of December 31, 2020, there had been no offering period or purchase period under the ESPP, and no such period will begin unless and until determined by the administrator.

Tender Offer and Stock Repurcha

Tender Offer and Stock Repurchases	12 Months Ended
	Dec. 31, 2020
Equity [Abstract]
Tender Offer and Stock Repurchases	13. Tender Offer and Stock Repurchases In September 2018, the Company was authorized to repurchase up to an aggregate of $100 million in shares of preferred and common stock for $9.60 per share for redeemable convertible preferred stock and $8.40 per share for common stock from certain holders. The tender offer transaction was completed in October 2018 and an aggregate of 189,685 shares of Series A redeemable convertible preferred stock, 107,600 shares of Series A-1 The purchase price in excess of the carrying value of repurchased Series A and A-1 paid-in Additionally, in 2018, the Company repurchased 193,775 shares of common stock from two employees as part of the separation arrangement at a price in excess of the fair value on the date of repurchase. Stock-based compensation expense as a result of the repurchase was not material during the year ended December 31, 2018. These shares were retired immediately upon repurchase. Repurchased common stock from exercised options under the 2014 Plan were returned to the pool of shares reserved for future issuance. During the years ended December 31, 2019 and 2020, stock repurchase activities were not material.

Income Taxes

Income Taxes	9 Months Ended	12 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Income Tax Disclosure [Abstract]
Income Taxes	10. Income Taxes The Company’s tax provision for interim periods is determined using an estimate of its annual effective tax rate, adjusted for discrete items, if any, that arise during the period. Each quarter, the Company updates its estimate of the annual effective tax rate and, if the estimated annual effective tax rate changes, the Company makes a cumulative adjustment in such period. The Company recorded $1 million and zero of provision for income taxes for the three months ended September 30, 2020 and 2021, respectively. The Company recorded $2 million and $3 million of provision for income taxes for the nine months ended September 30, 2020 and 2021, respectively. The provision for income taxes for all the periods presented were primarily attributable to state franchise taxes and income taxes in foreign jurisdictions. The Company regularly assesses the realizability of its deferred tax assets and establishes a valuation allowance if it is more-likely-than-not As of September 30, 2021, the Company had $61 million of unrecognized tax benefits, which, if recognized, would result in adjustments to the valuation allowance. The Company is subject to income tax audits in the United States and in foreign jurisdictions. The Company recorded liabilities related to uncertain tax positions and believes that the Company has provided adequate reserves for income tax uncertainties in all open tax years. Due to the Company’s history of tax losses, all years remain open to tax audits.	14. Income Taxes U.S. and foreign components of consolidated income (loss) before income taxes was as follows (in millions): Year Ended December 31, 2018 2019 2020 United States $ (204 ) $ (666 ) $ (463 ) Foreign — — 5 Loss before income taxes $ (204 ) $ (666 ) $ (458 ) The Company’s provision for income taxes for the years ended December 31, 2018, 2019, and 2020 was zero, $1 million, and $3 million, respectively. The provision for income taxes primarily consisted of franchise tax and U.S. federal and state income tax, as well as international taxes from foreign operations. The reconciliation of the statutory federal income tax rate to the Company’s effective tax rate was as follows: Year Ended December 31, 2018 2019 2020 Federal tax (benefit) at statutory rate 21 % 21 % 21 % State tax (benefit) at statutory rate, net of federal benefit 4 4 3 Change in valuation allowance (25 ) (23 ) (21 ) Stock-based compensation (1 ) — (2 ) Research and development credits 1 1 3 Change in fair value of forward contract liability — (3 ) — Non-deductible — — (3 ) Non-deductible — — (2 ) Provision for income taxes — % — % (1 )% No deferred tax liabilities for foreign withholding taxes have been recorded relating to the earnings of the Company’s foreign subsidiaries since all such earnings are intended to be indefinitely reinvested. The Company also elected to record the taxes for Global Intangible Low-Taxed The significant components of the Company’s deferred tax assets and liabilities were as follows (in millions): December 31, 2019 2020 Deferred tax assets Accruals and reserves $ 44 $ 95 Stock-based compensation 5 72 Tax credits carryforward 12 23 Operating leases 46 64 Net operating losses carryforward 200 180 Total gross deferred tax assets 307 434 Less: Valuation allowance (260 ) (357 ) Total deferred tax assets net of valuation allowance 47 77 Deferred tax liabilities Property and equipment and intangible assets — (19 ) ROU assets (42 ) (51 ) Deferred contract costs (5 ) (10 ) Total gross deferred tax liabilities (47 ) (80 ) Net deferred tax liabilities $ — $ (3 ) The Company accounts for deferred taxes under ASC 740, Income Taxes, which requires a reduction of the carrying amounts of deferred tax assets by a valuation allowance if, based on the available evidence, it is more likely than not that such assets will not be realized. Accordingly, the need to establish valuation allowances for deferred tax assets is assessed periodically based on the ASC 740 more-likely-than-not tax-planning recoverability of the deferred tax assets requires that the Company weigh all positive and negative evidence to reach a conclusion that it is more likely than not that all or some portion of the deferred tax assets will not be realized. The weight given to the evidence is commensurate with the extent to which it can be objectively verified. Due to the lack of U.S. earnings history, the U.S. federal and state deferred tax assets have been fully offset by a valuation allowance. Overall, the valuation allowance increased by $154 million and $97 million in the years ended December 31, 2019 and 2020, respectively. As of December 31, 2020, the Company had accumulated federal and state net operating loss carryforwards of $689 million and $547 million, respectively. Of the $689 million of federal net operating losses, $629 million is carried forward indefinitely but is limited to 80% of taxable income. The remaining federal and state net operating loss carryforwards will begin to expire in 2033 and 2023, respectively. The Company also had $19 million of federal and $12 million of California research and development tax credit carryforwards as of December 31, 2020. The federal research and development tax credits expire in varying amounts starting in 2033. The California research credits do not expire and may be carried forward indefinitely. The Company’s ability to utilize the net operating loss and tax credit carryforwards in the future may be subject to substantial restrictions in the event of past or future ownership changes as defined in Section 382 of the Internal Revenue Code of 1986, as amended, and similar state tax law. The most recent analysis of the Company’s historical ownership changes was completed through December 31, 2019. Based on the analysis, the Company does not anticipate a current limitation on the tax attributes. On March 27, 2020, the Coronavirus Aid, Relief, and Economic Security Act (CARES Act) was enacted in response to the COVID-19 Unrecognized Tax Benefits Included in the balance of unrecognized tax benefits as of both December 31, 2019 and 2020 was $7 million of tax benefits, that, if recognized, would result in adjustments to the valuation allowance. A reconciliation of the beginning and ending balance of gross unrecognized tax benefits is included in the table below (in millions): Year Ended December 31, 2018 2019 2020 Unrecognized tax benefits at beginning of year $ 1 $ 3 $ 7 Increases related to current year tax positions 2 4 3 Decreases related to prior year tax positions — — (3 ) Unrecognized tax benefits at end of year $ 3 $ 7 $ 7 The Company’s policy is to recognize accrued interest and penalties related to unrecognized tax benefits within provision for income taxes. The Company did not accrue any interest expense or penalties during the years ended December 31, 2018, 2019, and 2020. The Company files U.S. federal and state income tax returns in the United States federal jurisdiction as well as foreign jurisdictions. The Company’s income tax returns generally remain subject to examination by United States federal and state and foreign tax authorities.

Net Loss per Share Attributable

Net Loss per Share Attributable to Common Stockholders	9 Months Ended	12 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Earnings Per Share [Abstract]
Net Loss per Share Attributable to Common Stockholders	11. Net Loss per Share Attributable to Common Stockholders The Company computes net loss per share attributable to common stockholders using the two-class The following table sets forth the calculation of basic and diluted net loss per share attributable to common stockholders during the periods presented. RSUs that vested but have not been settled are included in the denominator in calculating net loss per share for the three and nine months ended September 30, 2021 (in millions, except share amounts which are reflected in thousands, and per share data): Three Months Ended Nine Months Ended September 30, 2020 2021 2020 2021 Common Class A Class B Common Class A Class B Net loss $ (43 ) $ (92 ) $ (9 ) $ (149 ) $ (284 ) $ (29 ) Weighted-average number of shares outstanding used to compute net loss per share, basic and diluted 45,016 308,797 31,372 44,568 302,954 31,323 Net loss per share, basic and diluted $ (0.96 ) $ (0.30 ) $ (0.30 ) $ (3.34 ) $ (0.94 ) $ (0.94 ) The following outstanding shares of potentially dilutive securities were excluded from the computation of diluted net loss per share because including them would have had an anti-dilutive effect, or issuance of such shares is contingent upon the satisfaction of certain performance or market conditions which were not satisfied at the end of the respective periods (in thousands): As of September 30, 2020 2021 Redeemable convertible preferred stock (on an as-converted 239,275 — Stock options to purchase common stock 34,554 21,428 Unvested restricted stock units 20,021 28,103 Convertible promissory notes 5,778 — Total 299,628 49,531	15. Net Loss per Share Attributable to Common Stockholders The Company computes net loss per share using the two-class The following table sets forth the calculation of basic and diluted net loss per share attributable to common stockholders during the periods presented. The shares issued in the IPO and the shares of Class A common stock issued upon conversion of the outstanding shares of redeemable convertible preferred stock in the IPO, as well as vested RSUs that have not been settled are included in the table below weighted for the period outstanding in the year ended December 31, 2020 (in millions, except share amounts which are reflected in thousands, and per share data): Year Ended December 31, 2018 2019 2020 Common Common Class A Class B Net loss $ (204 ) $ (667 ) $ (446 ) $ (15 ) Less: Premium paid on repurchase of redeemable convertible preferred stock (3 ) — — — Less: Deemed dividend to preferred stockholders — (1 ) — — Net loss attributable to common stockholders $ (207 ) $ (668 ) $ (446 ) $ (15 ) Weighted-average number of shares outstanding used to compute net loss per share attributable to common stockholders, basic and diluted 44,305 43,252 60,422 1,968 Net loss per share attributable to common stockholders, basic and diluted $ (4.67 ) $ (15.44 ) $ (7.39 ) $ (7.39 ) The following outstanding shares of potentially dilutive securities were excluded from the computation of diluted net loss per share because including them would have had an anti-dilutive effect (in thousands): Year Ended December 31, 2018 2019 2020 Redeemable convertible preferred stock (on an as-converted 191,602 230,953 — Stock options to purchase common stock 39,191 36,247 33,802 Unvested restricted stock units (1) 6,065 15,924 17,987 Common stock subject to repurchase 25 — — Convertible promissory notes — — 2,595 Total 236,883 283,124 54,384 (1) The CEO Performance Award is excluded from the above table because the Company Stock Price Target had not been met as of December 31, 2020.

401(k) Plan

401(k) Plan	12 Months Ended
	Dec. 31, 2020
Retirement Benefits [Abstract]
401(k) Plan	16. 401(k) Plan The Company has a 401(k) Plan that qualifies as a deferred salary arrangement under Section 401 of the Internal Revenue Code. Under the 401(k) Plan, eligible and participating employees may defer a portion of their pretax earnings not to exceed the maximum amount allowable. The Company does not make contributions for eligible employees.

Subsequent Events

Subsequent Events	9 Months Ended	12 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Subsequent Events [Abstract]
Subsequent Events	12. Subsequent Events On October 19, 2021, the Company closed a $400 million investment in preferred shares of a private company based in Europe which provides an instant grocery delivery service. The Company is assessing the accounting impact of this transaction on its condensed consolidated financial statements. On November 9, 2021, the Company entered into a definitive agreement to acquire Wolt Enterprises OY (“Wolt”). Headquartered in Helsinki, Finland, Wolt is a leading local commerce platform with operations in 23 countries across Europe, Japan, and Israel. The Company is expecting the acquisition of Wolt will increase its international scale, accelerate its product development, and improve its investment efficiency. The purchase price is approximately €7 billion in an all-stock	17. Subsequent Events Repayment of Convertible Notes In February 2021, the Company repaid the outstanding principal and accrued interest of the 2020 Notes in full for $375 million.

Summary of Significant Accoun_2

Summary of Significant Accounting Policies (Policies)	9 Months Ended	12 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation The accompanying unaudited condensed consolidated financial statements include the accounts of DoorDash, Inc. and its wholly-owned subsidiaries and have been prepared in accordance with accounting principles generally accepted in the United States of America (“GAAP”) and the requirements of the U.S. Securities and Exchange Commission (the “SEC”) for interim reporting. All intercompany transactions have been eliminated in consolidation. These unaudited condensed consolidated interim financial statements reflect all normal recurring adjustments that are, in the opinion of management, necessary to fairly present the information set forth herein. They should be read in conjunction with the audited consolidated financial statements and related notes included in the Company’s Annual Report on Form 10-K	Basis of Presentation The accompanying consolidated financial statements include the accounts of DoorDash, Inc. and its wholly-owned subsidiaries and have been prepared in accordance with accounting principles generally accepted in the United States of America (“GAAP”). All intercompany transactions have been eliminated in consolidation.
Reclassifications	Reclassifications Certain amounts from prior periods have been reclassified to conform to the current period presentation.	Reclassifications Certain amounts from prior periods have been reclassified to conform to the current period presentation.
Use of Estimates	Use of Estimates The preparation of condensed consolidated financial statements in accordance with GAAP requires management to make certain estimates, judgments, and assumptions that affect the reported amounts of assets and liabilities and the related disclosures at the date of the financial statements, as well as the reported amounts of revenue and expenses during Estimates for credit losses, gift card breakage, estimated useful lives of property and equipment, capitalized software and website development costs, intangible assets, stock-based compensation, valuation of investments and other financial instruments, valuation of acquired intangible assets and goodwill, the incremental borrowing rate applied in lease accounting, insurance reserves, loss contingencies, and income and indirect taxes. Actual results could differ from these estimates.	Use of Estimates The preparation of consolidated financial statements in accordance with GAAP requires management to make certain estimates, judgments, and assumptions that affect the reported amounts of assets and liabilities and the related disclosures at the date of the financial statements, as well as the reported amounts of revenue and expenses during the period presented. Estimates include, but are not limited to, revenue recognition, allowances for credit losses, estimated useful lives of property and equipment, capitalized software and website development costs, intangible assets, stock-based compensation, valuation of investments and other financial instruments, valuation of acquired intangible assets and goodwill, the incremental borrowing rate applied in lease accounting, insurance reserves, loss contingencies, and income and indirect taxes. Actual results could differ from these estimates.
Gift Cards, Contract Liabilities and Deferred Contract Costs	Gift Cards The Company sells gift cards to consumers that can be redeemed through its Marketplace. Those gift cards have no expiration date and administrative fees are not charged on unused gift cards. In prior periods, with limited history as to consumers’ redemption patterns, proceeds from the sale of gift cards were fully deferred and recorded as contract liabilities until consumers use the card to place orders on its platform. When gift cards are redeemed, revenue is recognized on a net basis as the difference between the amounts collected from consumers less amounts remitted to merchants and Dashers. During the third quarter of 2021, the Company concluded that it had developed sufficient historical evidence regarding the pattern of consumer redemptions of gift cards to have the ability to estimate the portion of outstanding gift cards that will never be redeemed (“breakage”) and for which there is no legal obligation to remit the value of the unredeemed gift cards to the relevant jurisdiction as unclaimed or abandoned property. The Company recognizes the breakage amounts as revenue, proportionate to the pattern of revenue recognition for the gift card redemptions. As a result of this change in estimate, the Company recorded $36 million of gift card breakage revenue during the three months ended September 30, 2021. Estimating future breakage rates requires judgment based on current and historical patterns of redemption, and the actual breakage rates may vary from the estimate.	Revenue Recognition The Company recognizes revenue in accordance with the Financial Accounting Standards Board (“FASB”) Accounting Standards Codification (“ASC”) 606, Revenue from Contracts with its Customers. per-order When determining the appropriate accounting for the fees collected in exchange for the use of the Company’s local logistics platform, the Company considered its contractual arrangements with the parties involved as well as its customary business practices. Under the Company’s agreements with partner merchants, the Company agrees to a commission to be earned as a percentage of the total dollar value of goods ordered. When a consumer signs up to use the Company’s local logistics platform, the consumer agrees to be charged certain fees, at the time an order is placed, in exchange for use of the platform. The Company has concluded that a contract exists between the Company and a partner merchant when the partner merchant accepts each consumer’s order, and a contract exists between the Company and a consumer when the consumer places the order and requests delivery services. The duration of a contract is typically equal to the time between when the order is placed and a Dasher picks up the food from the merchant. Contracts including variable consideration with partner merchants were not material for the periods presented. The Company’s local logistics platform facilitates orders between consumers and partner merchants. Separately, the Company’s platform arranges for consumers to obtain delivery service from Dashers. The Company has determined that the order facilitation service and delivery facilitation service are distinct performance obligations and has therefore considered whether it is a principal or agent separately for each of these items. The order facilitation service and the delivery facilitation service are distinct given that the consumer can benefit from each item separately. Further, the order facilitation service and delivery facilitation service are separately identifiable as the nature of the promises are to transfer the order facilitation service and delivery facilitation service individually, rather than as a combined item. Principal vs. Agent Considerations Judgment is required in determining whether the Company is the principal or the agent in transactions with partner merchants, consumers, and Dashers. As it relates to the accounting for order facilitation services and delivery facilitation services, the Company evaluated whether to present revenue on a gross versus net basis based on whether it controls each specified good or service before it is provided to the consumer in DoorDash Marketplace transactions. With respect to order facilitation services, the Company has determined it is an agent for partner merchants in facilitating the sale of products to the consumer through the DoorDash Marketplace. The consumer accesses the Company’s local logistics platform to identify merchants and places an order for merchants’ products. These orders are picked up from partner merchants and delivered to consumers by Dashers. The Company does not control the products prior to them being transferred to the consumer as it neither has the ability to redirect the products to another consumer nor does it obtain any economic benefit from the products. With respect to delivery facilitation services, the Company has determined it is acting as an agent for the consumer in facilitating the delivery of products by connecting consumers with Dashers. As the Company’s role with the delivery facilitation service is only to arrange for a delivery opportunity to be offered to prospective Dashers, it does not control how the delivery service is ultimately provided to the consumer. As the Company is an agent in facilitating the sale of products and delivery services, the Company reports revenue on a net basis, reflecting amounts collected from consumers, less amounts remitted to merchants and Dashers. Dasher payout represents the amounts paid to Dashers for deliveries, including incentives and tips, except for certain referral bonuses. From time to time, Dashers may request an earlier payment settlement in exchange for a reduction in Dasher payout. The amounts payable to merchants and Dashers are included in accrued expenses and other current liabilities on the consolidated balance sheets as payments are typically settled on a weekly basis. The Company recognizes revenue from both partner merchants and consumers for each successfully completed transaction. The Company satisfies its performance obligations to a partner merchant when there is a successful sale of the merchant’s products and meets its performance obligation to a consumer once the Dasher has picked up the products from the merchant for delivery to the consumer. DoorDash also provides value-add Gift Cards The Company sells gift cards to consumers that can be redeemed through its Marketplace. Proceeds from the sale of gift cards are deferred and recorded as contract liabilities until consumers use the card to place orders on its platform. When gift cards are redeemed, revenue is recognized on a net basis as the difference between the amounts collected from consumers less amounts remitted to merchants and Dashers. Refunds and Credits From time to time the Company issues credits or refunds to merchants and consumers to ameliorate issues that may arise with orders. The Company accounts for such refunds as variable consideration and therefore records the amount of each refund or credit issued as a reduction of revenue. Incentive Programs The Company offers incentives to attract consumers and Dashers to use its local logistics platform. Consumers typically receive credits or discounted delivery fees while Dashers typically receive cash incentives. Each of the incentives are described below: Consumer Promotions The Company uses promotions in tandem with sales and marketing spend to attract new consumers to its platform. Promotions offered to consumers are primarily recorded as a reduction of revenue and include the following: New consumer incentives: Consumer referrals: Existing consumer incentives: Dasher Incentives and Referrals The Company offers various incentives to Dashers, which are primarily recorded within Dasher payout and reduce revenue. These are offered in various forms and include: Peak pay Dasher referrals Cost of Revenue, Exclusive of Depreciation and Amortization Cost of revenue primarily consists of (i) order management costs, which include payment processing charges, net of rebates issued from payment processors, costs associated with cancelled orders, costs related to placing orders with non-partner
Segments		Segments Operating segments are defined as components of an entity for which separate financial information is available and that is regularly reviewed by the Chief Operating Decision Maker (“CODM”) in deciding how to allocate resources to an individual segment and in assessing performance. The Company’s Chief Executive Officer is the Company’s CODM. The CODM reviews financial information presented on a consolidated basis for purposes of making operating decisions, allocating resources, and evaluating financial performance. As such, the Company has determined that it operates in one reportable segment. See Note 3 for revenue by geography. As of December 31, 2019, long-lived assets located outside of the United States were not material. As of December 31, 2020, long-lived assets located outside of the United States were $21 million.
Business Combinations		Business Combinations The Company accounts for business combinations using the acquisition method of accounting, which requires, among other things, allocation of the fair value of purchase consideration to the tangible and intangible assets acquired and liabilities assumed at their estimated fair values on the acquisition date. The excess of the fair value of purchase consideration over the values of these identifiable assets and liabilities is recorded as goodwill. When determining the fair value of assets acquired and liabilities assumed, management makes significant estimates and assumptions, especially with respect to the valuation of intangible assets. Management’s estimates of fair value are based upon assumptions believed to be reasonable, but which are inherently uncertain and unpredictable and, as a result, actual results may differ from estimates. During the measurement period, not to exceed one year from the date of acquisition, the Company may record adjustments to the assets acquired and liabilities assumed, with a corresponding offset to goodwill if new information is obtained related to facts and circumstances that existed as of the acquisition date. Upon the conclusion of the measurement period or final determination of the fair value of assets acquired or liabilities assumed, whichever comes first, any subsequent adjustments are reflected in the consolidated statements of operations. Acquisition costs, such as legal and consulting fees, are expensed as incurred.
Cash, Cash Equivalents, and Restricted Cash		Cash, Cash Equivalents, and Restricted Cash Cash includes demand deposits with banks or financial institutions as well as cash in transit from payment processors. Cash equivalents include short-term, highly liquid investments with original maturities of three months or less and their carrying values approximate fair value due to their short-term maturities. Restricted cash consists of collateral provided for letters of credit established primarily for real estate leases and insurance policies. As of December 31, 2020, the restricted cash balance was not material.
Marketable Securities		Marketable Securities Marketable securities primarily consist of commercial paper, U.S. government agency securities, U.S. Treasury securities, and corporate bonds. The Company invests in a diversified portfolio of marketable securities and limits the concentration of its investment in any particular security. Securities with original maturities greater than three months, but less than one year, are included in current assets and securities with original maturities greater than one year are included in non-current available-for-sale If the estimated fair value of an available-for-sale
Funds Held at Payment Processors		Funds Held at Payment Processors Funds held at payment processors represent cash due from the Company’s payment processors for cleared transactions with merchants and consumers, as well as funds transferred to payment processors for Dasher payout.
Accounts Receivable, Net and Allowance for Credit Losses		Accounts Receivable, Net and Allowance for Credit Losses Accounts receivable, net primarily represents receivables from merchants generated through the Company’s Drive offering. The Company maintains an allowance for credit losses, which is based on the Company’s assessment of the collectability of accounts. The Company regularly reviews the adequacy of the allowance for credit losses on a collective basis by considering the age of each outstanding invoice, each customer’s expected ability to pay and collection history, current market conditions, and reasonable and supportable forecasts of future economic conditions to determine whether the allowance is appropriate. Accounts receivable deemed uncollectible are charged against the allowance for credit losses when identified.
Property and Equipment, Net		Property and Equipment, Net Property and equipment are recorded at cost and depreciated using the straight-line method over the estimated useful lives of the related assets. The useful lives are as follows: Estimated Useful Life Equipment for merchants 2 years Computer equipment and software 2 years Office equipment 5 years Capitalized software and website development costs 2 years Leasehold improvements Shorter of estimated useful life or lease term
Goodwill and Intangible Assets		Goodwill Goodwill represents the excess of the purchase price over the fair value of the net tangible and intangible assets acquired in a business combination. Goodwill is not amortized, but is tested for impairment at least annually or more frequently if events or changes in circumstances indicate that the asset may be impaired. The Company’s impairment tests are based on a single operating segment and reporting unit structure. If the carrying value of the reporting unit exceeds its fair value, an impairment charge is recognized for the excess of the carrying value of the reporting unit over its fair value. The Company conducted its annual goodwill impairment test during the fourth quarter of 2020 and determined that the fair value of the reporting unit significantly exceeded its carrying value. No impairment charge was recorded in any of the periods presented in the accompanying consolidated financial statements. Intangible Assets, Net Intangible assets are recorded at fair value as of the date of acquisition and amortized on a straight-line basis over their estimated useful lives. The Company reviews identifiable amortizable intangible assets to be held and used for impairment under the long-lived asset model described under “Impairment of Long-Lived Assets” below. Capitalized Software and Website Development Costs The Company incurred costs relating to the development of the Company’s technology platform, which includes Dasher and merchant tools, mobile apps, and website and content development. Software development costs related to software acquired, developed, or modified solely to meet the Company’s internal requirements, with no substantive plans to market such software at the time of development, are capitalized during the application development stage of the project. Costs incurred during the preliminary planning and evaluation stage of the project and during the post implementation operational stage are expensed as incurred. Costs to develop the Company’s technology platform are capitalized when preliminary development efforts are successfully completed, management has authorized and committed project funding, and it is probable that the project will be completed and the software will be used as intended. Costs incurred for enhancements that are expected to result in additional functionality are capitalized and expensed over the estimated useful life of the upgrades on a per project basis.
Impairment of Long-Lived Assets		Impairment of Long-Lived AssetsThe Company evaluates its long-lived assets or asset groups for indicators of possible impairment by comparison of the carrying amount to future net undiscounted cash flows expected to be generated by such asset or asset group when events or changes in circumstances indicate the carrying amount of an asset or asset group may not be recoverable. Should an impairment exist, the impairment loss would be measured based on the excess carrying value of the asset or asset group over the asset’s or asset group’s fair value generally determined by estimates of future discounted cash flows. Assets to be disposed of are reported at the lower of their carrying amount or fair value less costs to sell.
Insurance Reserves		Insurance Reserves The Company utilizes a combination of third-party insurance and self-insurance programs to insure costs including auto liability related to both bodily injury and physical damage, and uninsured and underinsured motorists up to a certain dollar retention limit. The recorded self-insurance reserves reflect the estimated cost for claims incurred but not paid and claims that have been incurred but not yet reported. The estimate of the Company’s self-insured ultimate obligation utilizes actuarial techniques applied to historical claim and loss experience. The Company utilizes assumptions based on actuarial judgment with consideration toward relevant industry claim and loss development factors, which includes the development time frame and settlement patterns, and expected loss rates. To limit exposure to some risks, the Company maintains additional insurance coverage with varying limits and retentions. The Company cannot predict whether this insurance will be adequate to cover all potential hazards incidental to its business. Reserves are periodically reviewed and adjusted as necessary as experience develops or new information becomes known. However, ultimate results may differ from the Company’s estimates, which could result in losses over the Company’s reserved amounts.
Loss Contingencies		Loss Contingencies The Company is involved in various lawsuits, claims, investigations, and proceedings that arise in connection with its business. Certain of these matters include speculative claims for substantial or indeterminate amounts of damages. The Company records a liability in accrued expenses and other current liabilities on the consolidated
Sales and Indirect Taxes		Sales and Indirect Taxes The Company records sales and indirect tax liabilities when they become probable and the amount can be reasonably estimated. Sales and indirect tax liabilities are included in accrued expenses and other current liabilities on the consolidated balance sheets.
Accumulated Other Comprehensive Income (Loss)		Accumulated Other Comprehensive Income (Loss) Accumulated other comprehensive income (loss) consists of foreign currency translation adjustments and unrealized gains and losses on available-for-sale Available-for-sale
Stock-Based Compensation		Stock-Based Compensation The Company estimates the fair value of stock options granted to employees and directors using the Black-Scholes option-pricing model. The fair value of stock options is recognized as compensation expense on a straight-line basis over the requisite service period, which is typically four years. The Black-Scholes model considers several variables and assumptions in estimating the fair value of stock-based awards. These variables include: • per share fair value of the underlying common stock; • exercise price; • expected term; • risk-free interest rate; • expected stock price volatility over the expected term; and • expected annual dividend yield. For all stock options granted, the Company calculated the expected term using the simplified method for “plain vanilla” stock option awards. The risk-free interest rate is based on the yield available on U.S. Treasury zero-coupon The fair value of RSUs is estimated based on the fair value of the Company’s common stock on the date of grant. Prior to November 2020, RSUs granted by the Company vest upon the satisfaction of both a service-based vesting condition, which is typically four years, and a liquidity event-related performance vesting condition. The liquidity event-related performance vesting condition was achieved upon the consummation of the Company’s IPO, and the Company recorded a cumulative stock-based compensation expense of $279 million as of the IPO date for those RSUs for which the service-based vesting condition has been satisfied. Stock-based compensation related to the remaining service-based period after the liquidity event-related performance vesting condition was satisfied will be recorded over the remaining requisite service period using the accelerated attribution method. Since November 2020, with the exception of the CEO Performance Award (as discussed further in Note 12), the Company only granted RSUs that vest upon the satisfaction of a service-based vesting condition and the compensation expense for these RSUs is recognized on a straight-line basis over the requisite service period. For the CEO Performance Award that includes a market condition, the fair value of the award is determined using a Monte Carlo simulation model. The associated stock-based compensation is recorded over the derived service period, using the accelerated attribution method. If the stock price goals are met sooner than the derived service period, the Company will adjust the stock-based compensation expense to reflect the cumulative expense associated with the vested award. Provided that Tony Xu continues to be the Chief Executive Officer of the Company, Stock-based compensation expense is recognized over the requisite service period, regardless of whether the stock price goals are achieved. Prior to the IPO, the fair value of the shares of common stock underlying the stock options and RSUs has historically been determined by the Company’s board of directors as there is no public market for the underlying common stock. The Company’s board of directors determined the fair value of the Company’s common stock by considering a number of objective and subjective factors including: contemporaneous third-party valuations of its common stock, the valuation of comparable companies, sales of the Company’s common and redeemable convertible preferred stock to outside investors in arms-length transactions (including the IPO), the Company’s operating and financial performance, the lack of marketability, and the general and industry specific economic outlook, amongst other factors. After the completion of the IPO, the fair value of the Company’s Class A common stock is determined based on the New York Stock Exchange (“NYSE”) closing price on the date of grant. The Company records forfeitures when they occur for all share-based payment awards.
Provision for Income Taxes		Provision for Income Taxes The Company accounts for income taxes using the asset and liability method. Under this method, deferred income tax assets and liabilities are recorded based on the estimated future tax effects of differences between the financial statement and income tax basis of existing assets and liabilities. These differences are measured using the enacted statutory tax rates that are expected to apply to taxable income for the years in which differences are expected to reverse. The Company recognizes the effect on deferred income taxes of a change in tax rates in the period that includes the enactment date. The Company records a valuation allowance to reduce its deferred tax assets to the net amount that it believes is more-likely-than-not The Company operates in various tax jurisdictions and is subject to audit by tax authorities. The Company recognizes the tax benefit of an uncertain tax position only if it is more-likely-than-not
Fair Value		Fair Value The Company measures certain assets and liabilities at fair value on a recurring basis based on an expected exit price, which represents the amount that would be received on the sale of an asset or paid to transfer a liability in an orderly transaction between market participants. As such, fair value may be based on assumptions that market participants would use in pricing an asset or liability. The authoritative guidance on fair value measurements establishes a consistent framework for measuring fair value on either a recurring or nonrecurring basis, whereby inputs used in valuation techniques, are assigned a hierarchical level. The following are the hierarchical levels of inputs to measure fair value: Level 1 Observable inputs that reflect quoted prices (unadjusted) for identical assets or liabilities in active markets. Level 2 Inputs reflect quoted prices for identical assets or liabilities in markets that are not active; quoted prices for similar assets or liabilities in active markets; inputs other than quoted prices that are observable for the assets or liabilities; or inputs that are derived principally from or corroborated by observable market data by correlation or other means. Level 3 Unobservable inputs reflecting the Company’s own assumptions incorporated in valuation techniques used to determine fair value. These assumptions are required to be consistent with market participant assumptions that are reasonably available. The carrying amounts of certain of the Company’s financial instruments, which include cash equivalents, accounts receivable, prepaid expenses and other current assets, accounts payable, and accrued expenses and other current liabilities approximate their fair values due to their short maturities. The carrying value of the Company’s convertible promissory notes entered into in February 2020, which are recorded at amortized cost, approximates fair value as the stated interest rate approximates market rates for similar loans.
Concentration of Credit Risk		Concentration of Credit Risk The Company’s cash, cash equivalents, marketable securities, funds held at payment processors, and accounts receivable are potentially subject to concentration of credit risk. Although the Company deposits its cash with multiple financial institutions, the deposits, at times, may exceed federally insured limits. Management believes that the institutions are financially stable and, accordingly, minimal credit risk exists. The Company limits purchases of debt securities to investment-grade securities. The Company has not experienced any significant credit losses historically. The Company relies on a limited number of third parties to provide payment processing services (“payment processors”) including collecting amounts due from end-users pre-authorizes Accounts receivable, net primarily represents receivables from merchants that were generated through the Company’s Drive offering. As of December 31, 2019, two entities individually accounted for 26% and 11% of accounts receivable, net, respectively. As of December 31, 2020, three entities individually accounted for 20%, 14%, and 10% of accounts receivable, net, respectively. No customer accounted for 10% or more of revenue for the years ended December 31, 2018, 2019, and 2020.
Revenue Recognition	Gift Cards The Company sells gift cards to consumers that can be redeemed through its Marketplace. Those gift cards have no expiration date and administrative fees are not charged on unused gift cards. In prior periods, with limited history as to consumers’ redemption patterns, proceeds from the sale of gift cards were fully deferred and recorded as contract liabilities until consumers use the card to place orders on its platform. When gift cards are redeemed, revenue is recognized on a net basis as the difference between the amounts collected from consumers less amounts remitted to merchants and Dashers. During the third quarter of 2021, the Company concluded that it had developed sufficient historical evidence regarding the pattern of consumer redemptions of gift cards to have the ability to estimate the portion of outstanding gift cards that will never be redeemed (“breakage”) and for which there is no legal obligation to remit the value of the unredeemed gift cards to the relevant jurisdiction as unclaimed or abandoned property. The Company recognizes the breakage amounts as revenue, proportionate to the pattern of revenue recognition for the gift card redemptions. As a result of this change in estimate, the Company recorded $36 million of gift card breakage revenue during the three months ended September 30, 2021. Estimating future breakage rates requires judgment based on current and historical patterns of redemption, and the actual breakage rates may vary from the estimate.	Revenue Recognition The Company recognizes revenue in accordance with the Financial Accounting Standards Board (“FASB”) Accounting Standards Codification (“ASC”) 606, Revenue from Contracts with its Customers. per-order When determining the appropriate accounting for the fees collected in exchange for the use of the Company’s local logistics platform, the Company considered its contractual arrangements with the parties involved as well as its customary business practices. Under the Company’s agreements with partner merchants, the Company agrees to a commission to be earned as a percentage of the total dollar value of goods ordered. When a consumer signs up to use the Company’s local logistics platform, the consumer agrees to be charged certain fees, at the time an order is placed, in exchange for use of the platform. The Company has concluded that a contract exists between the Company and a partner merchant when the partner merchant accepts each consumer’s order, and a contract exists between the Company and a consumer when the consumer places the order and requests delivery services. The duration of a contract is typically equal to the time between when the order is placed and a Dasher picks up the food from the merchant. Contracts including variable consideration with partner merchants were not material for the periods presented. The Company’s local logistics platform facilitates orders between consumers and partner merchants. Separately, the Company’s platform arranges for consumers to obtain delivery service from Dashers. The Company has determined that the order facilitation service and delivery facilitation service are distinct performance obligations and has therefore considered whether it is a principal or agent separately for each of these items. The order facilitation service and the delivery facilitation service are distinct given that the consumer can benefit from each item separately. Further, the order facilitation service and delivery facilitation service are separately identifiable as the nature of the promises are to transfer the order facilitation service and delivery facilitation service individually, rather than as a combined item. Principal vs. Agent Considerations Judgment is required in determining whether the Company is the principal or the agent in transactions with partner merchants, consumers, and Dashers. As it relates to the accounting for order facilitation services and delivery facilitation services, the Company evaluated whether to present revenue on a gross versus net basis based on whether it controls each specified good or service before it is provided to the consumer in DoorDash Marketplace transactions. With respect to order facilitation services, the Company has determined it is an agent for partner merchants in facilitating the sale of products to the consumer through the DoorDash Marketplace. The consumer accesses the Company’s local logistics platform to identify merchants and places an order for merchants’ products. These orders are picked up from partner merchants and delivered to consumers by Dashers. The Company does not control the products prior to them being transferred to the consumer as it neither has the ability to redirect the products to another consumer nor does it obtain any economic benefit from the products. With respect to delivery facilitation services, the Company has determined it is acting as an agent for the consumer in facilitating the delivery of products by connecting consumers with Dashers. As the Company’s role with the delivery facilitation service is only to arrange for a delivery opportunity to be offered to prospective Dashers, it does not control how the delivery service is ultimately provided to the consumer. As the Company is an agent in facilitating the sale of products and delivery services, the Company reports revenue on a net basis, reflecting amounts collected from consumers, less amounts remitted to merchants and Dashers. Dasher payout represents the amounts paid to Dashers for deliveries, including incentives and tips, except for certain referral bonuses. From time to time, Dashers may request an earlier payment settlement in exchange for a reduction in Dasher payout. The amounts payable to merchants and Dashers are included in accrued expenses and other current liabilities on the consolidated balance sheets as payments are typically settled on a weekly basis. The Company recognizes revenue from both partner merchants and consumers for each successfully completed transaction. The Company satisfies its performance obligations to a partner merchant when there is a successful sale of the merchant’s products and meets its performance obligation to a consumer once the Dasher has picked up the products from the merchant for delivery to the consumer. DoorDash also provides value-add Gift Cards The Company sells gift cards to consumers that can be redeemed through its Marketplace. Proceeds from the sale of gift cards are deferred and recorded as contract liabilities until consumers use the card to place orders on its platform. When gift cards are redeemed, revenue is recognized on a net basis as the difference between the amounts collected from consumers less amounts remitted to merchants and Dashers. Refunds and Credits From time to time the Company issues credits or refunds to merchants and consumers to ameliorate issues that may arise with orders. The Company accounts for such refunds as variable consideration and therefore records the amount of each refund or credit issued as a reduction of revenue. Incentive Programs The Company offers incentives to attract consumers and Dashers to use its local logistics platform. Consumers typically receive credits or discounted delivery fees while Dashers typically receive cash incentives. Each of the incentives are described below: Consumer Promotions The Company uses promotions in tandem with sales and marketing spend to attract new consumers to its platform. Promotions offered to consumers are primarily recorded as a reduction of revenue and include the following: New consumer incentives: Consumer referrals: Existing consumer incentives: Dasher Incentives and Referrals The Company offers various incentives to Dashers, which are primarily recorded within Dasher payout and reduce revenue. These are offered in various forms and include: Peak pay Dasher referrals Cost of Revenue, Exclusive of Depreciation and Amortization Cost of revenue primarily consists of (i) order management costs, which include payment processing charges, net of rebates issued from payment processors, costs associated with cancelled orders, costs related to placing orders with non-partner
Sales and Marketing and General and Administrative		Sales and Marketing Sales and marketing expenses primarily consist of advertising and other ancillary expenses related to merchant, consumer, and Dasher acquisition, including certain consumer referral credits and Dasher referral fees paid to the referrers to the extent they represent fair value of acquiring a new consumer or a new Dasher, brand marketing expenses, personnel-related compensation expenses for sales and marketing employees, and commissions expense including amortization of deferred contract costs, as well as allocated overhead. Advertising expenses were $81 million, $446 million, and $698 million for the years ended December 31, 2018, 2019, and 2020, respectively. General and Administrative General and administrative expenses primarily consist of legal, tax, and regulatory expenses, which include litigation settlement expenses and sales and indirect taxes, personnel-related compensation expenses related to
Research and Development		Research and Development Research and development expenses primarily consist of personnel-related compensation expenses related to data analytics and the design of, product development of, and improvements to the Company’s platform, as well as expenses associated with the licensing of third-party software and allocated overhead.
Depreciation and Amortization		Depreciation and Amortization Depreciation and amortization expenses primarily consist of depreciation and amortization expenses associated with the Company’s property and equipment and intangible assets. Depreciation includes expenses associated with equipment for merchants, including equipment for merchants under finance leases, computer equipment and software, office equipment, and leasehold improvements. Amortization includes expenses associated with the Company’s capitalized software and website development costs, as well as acquired intangible assets. Depreciation and amortization are excluded from cost of revenue and operating expenses.
Net Loss Per Share Attributable to Common Stockholders		Net Loss Per Share Attributable to Common Stockholders The Company computes net loss per common share following the two-class two-class as-converted Basic net loss per share is computed by dividing the net loss attributable to common stockholders by the weighted-average number of shares of common stock outstanding during the period, less shares subject to repurchase. The diluted net loss per share is computed by giving effect to all potentially dilutive securities outstanding for the period. For periods in which the Company reports net losses, diluted net loss per common share is the same as basic net loss per common share, because all potentially dilutive securities are anti-dilutive. Vested RSUs that have not been settled have been included in the appropriate common share class used to calculate basic net loss per share. Upon completion of the Company’s IPO, all of the Company’s outstanding shares of redeemable convertible preferred stock were automatically converted into 239 million shares of common stock and their carrying amount reclassified into stockholders’ (deficit) equity. As of December 31, 2020, there were no shares of redeemable convertible preferred stock issued and outstanding.
Deferred Offering Costs		Deferred Offering Costs Deferred offering costs, which consist of direct incremental legal, consulting, accounting, and other fees relating to the anticipated sale of the Company’s common stock in the IPO, are initially capitalized and recorded in other assets on the consolidated balance sheets. As of December 31, 2019, deferred offering costs capitalized was $5 million. After the IPO, all deferred offering costs were reclassified into stockholders’ (deficit) equity as a reduction of the IPO proceeds on the consolidated balance sheets.
Leases		Leases The Company applies the guidance in Accounting Standards Update (“ASU”) No. 2016-02, non-lease right-of-use The Company determines if an arrangement is or contains a lease at inception. A contract is or contains a lease if it conveys the right to control the use of an identified asset for a period of time in exchange for consideration. The Company’s classes of assets that are leased include real estate leases and equipment leases. Operating leases consist of real estate leases and are included in operating lease ROU assets and operating lease liabilities on the Company’s consolidated balance sheets. Finance leases consist of equipment leases and are included in property and equipment, net on the Company’s consolidated balance sheets. The Company’s real estate leases are for an initial period between one The Company subleases certain portions of buildings subject to operating leases. The terms and conditions of the subleases are commensurate with the terms and conditions within the original operating leases. The term of the subleases generally range from four When the discount rate implicit in the lease cannot be readily determined, the Company uses the applicable incremental borrowing rate at lease commencement in order to discount lease payments to present value for purposes of performing lease classification tests and measuring the lease liability. The incremental borrowing rate represents the rate of interest the Company would have to pay to borrow on a collateralized basis over a similar term an amount equal to the lease payments in a similar economic environment. Because the Company does not generally borrow on a collateralized basis, it uses a derived unsecured synthetic credit rating adjusted for collateralization, current available yield curves, and the lease term as inputs to derive an appropriate incremental borrowing rate.
Recent Accounting Pronouncements Adopted		Recent Accounting Pronouncements Adopted In June 2016, the FASB issued ASU No. 2016-13 2016-13”). 2016-13 available-for-sale recorded through an allowance for credit losses rather than as a reduction in the amortized cost basis of the securities. Effective on December 31, 2020, the Company lost its emerging growth company (“EGC”) status which accelerated the requirement of the adoption of ASU 2016-13. 2016-13 Recent Accounting Pronouncements Not Yet Adopted In December 2019, the FASB issued ASU 2019-12, step-up In August 2020, the FASB issued ASU 2020-06, 470-20) 815-40)” if-converted In October 2020, the FASB issued ASU 2020-10,

Revenue (Tables)

Revenue (Tables)	9 Months Ended	12 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Revenue from Contract with Customer [Abstract]
Disaggregation of Revenue	Revenue by geographic area is determined based on the address of the merchant, or in the case of DashPass, the address of the consumer. Revenue by geographic area was as follows (in millions): Three Months Ended September 30, Nine Months Ended September 30, 2020 2021 2020 2021 United States $ 875 $ 1,275 $ 1,912 $ 3,577 International 4 — 4 11 Total revenue $ 879 $ 1,275 $ 1,916 $ 3,588	Revenue by offering was as follows (in millions): Year Ended December 31, 2018 2019 2020 Core business $ 282 $ 876 $ 2,886 Other revenue 9 9 — Total revenue $ 291 $ 885 $ 2,886 Core business is primarily comprised of Marketplace, which includes Pickup and DoorDash for Work, and Drive. Year Ended December 31, 2018 2019 2020 United States $ 282 $ 877 $ 2,875 International 9 8 11 Total revenue $ 291 $ 885 $ 2,886
Contract Liabilities	A summary of activities related to contract liabilities for the nine months ended September 30, 2021 was as follows (in millions): Contract Beginning balance $ 108 Addition to contract liabilities 815 Reduction of contract liabilities (799 ) Ending balance $ 124 (1) Gift cards and certain consumer credits can be redeemed through the Company’s online Marketplace. When they are redeemed, revenue is recognized on a net basis as the difference between the carrying amount of the gift cards and consumer credits and the amount due to merchants and Dashers for those transactions. Therefore, the amount recognized as revenue related to the reduction of gift cards and certain consumer credits is less than the amount presented in the table above. Net revenues associated with gift cards and certain consumer credits is not tracked by the Company as it is impracticable to do so. (2) Included in the beginning balance of contract liabilities was $22 million associated with unearned prepayments received by the Company, all of which was recognized as revenue during the nine months ended September 30, 2021. (3) During the three months ended September 30, 2021, the Company recorded $36 million of gift card breakage revenue, which represented the estimate of cumulative gift card breakage through September 30, 2021 based on the Company’s accounting policy discussed in Note 2.
Deferred Contract Costs	A summary of activities related to deferred contract costs was as follows (in millions): Nine Months Ended September 30, 2020 2021 Beginning balance $ 21 $ 43 Capitalization of deferred contract costs 21 26 Amortization of deferred contract costs (6 ) (15 ) Ending balance $ 36 $ 54 Deferred contract costs, current $ 11 $ 22 Deferred contract costs, non-current 25 32 Total deferred contract costs $ 36 $ 54	A summary of activities related to deferred contract costs was as follows (in millions): Year Ended December 31, 2018 2019 2020 Beginning balance $ 2 $ 6 $ 21 Capitalization of deferred contract costs 5 19 32 Amortization of deferred contract costs (1 ) (4 ) (10 ) Ending balance $ 6 $ 21 $ 43 Deferred contract costs, current $ 2 $ 4 $ 16 Deferred contract costs, non-current 4 17 27 Total deferred contract costs $ 6 $ 21 $ 43
Allowance for Credit Losses	The allowance for credit losses related to accounts receivable and changes for the nine months ended September 30, 2021 were as follows (in millions): Nine Months September 30, Beginning balance $ 13 Additions to the provision for expected credit losses 31 Writeoffs charged against the allowance (5 ) Ending balance $ 39

Summary of Significant Accoun_3

Summary of Significant Accounting Policies (Tables)	9 Months Ended	12 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Accounting Policies [Abstract]
Property, Plant and Equipment [Table Text Block]	Property and equipment, net consisted of the following (in millions): December 31, September 30, Equipment for merchants $ 111 $ 147 Capitalized software and website development costs 86 226 Leasehold improvements 57 83 Computer equipment and software 22 39 Office equipment 11 19 Construction in progress 27 42 Total 314 556 Less: Accumulated depreciation and amortization (104 ) (201 ) Property and equipment, net $ 210 $ 355	useful lives are as follows: Estimated Useful Life Equipment for merchants 2 years Computer equipment and software 2 years Office equipment 5 years Capitalized software and website development costs 2 years Leasehold improvements Shorter of estimated useful life or lease term Property and equipment, net consisted of the following (in millions): December 31, December 31, Equipment for merchants $ 55 $ 111 Computer equipment and software 12 22 Capitalized software and website development costs 25 86 Leasehold improvements 31 57 Office equipment 7 11 Construction in progress 10 27 Total 140 314 Less: Accumulated depreciation and amortization (39 ) (104 ) Property and equipment, net $ 101 $ 210

Acquisition (Tables)

Acquisition (Tables)	12 Months Ended
	Dec. 31, 2020
Business Combinations [Abstract]
Schedule of Recognized Identified Assets Acquired and Liabilities Assumed	The following table summarizes the fair values of the assets acquired and liabilities assumed as of the acquisition date (in millions): October 31, Prepaid expenses and other current assets $ 4 Intangible assets 106 Goodwill 305 Accrued expenses and other current liabilities (3 ) Other liabilities (1 ) Total purchase price $ 411
Finite-Lived and Indefinite-Lived Intangible Assets Acquired as Part of Business Combination	The following table sets forth the components of identifiable intangible assets acquired (in millions) and their estimated useful lives as of the date of acquisition (in years): Estimated October 31, Existing technology 1.5 $ 45 Vendor relationships 13.0 45 Courier relationships 1.5 1 Customer relationships 3.0 9 Trade name and trademarks 3.0 6 Total acquired intangible assets $ 106
Pro Forma Information	The unaudited pro forma results were as follows (in millions): Year Ended December 31, 2018 2019 Revenue $ 361 $ 971 Net loss (291 ) (726 )

Goodwill and Intangible Asset_2

Goodwill and Intangible Assets, Net (Tables)	9 Months Ended	12 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Goodwill		The changes in the carrying amount of goodwill for the periods presented were as follows (in millions): Total Balance as of December 31, 2018 $ — Acquisitions 306 Balance as of December 31, 2019 306 Acquisitions 10 Balance as of December 31, 2020 $ 316
Schedule of Intangible Assets	Intangible assets, net consisted of the following as of December 31, 2020 (in millions): Weighted- Gross Accumulated Net Carrying Existing technology 7.6 $ 71 $ (48 ) $ 23 Vendor relationships 11.8 45 (4 ) 41 Courier relationships 0.3 1 (1 ) — Customer relationships 1.8 9 (3 ) 6 Trade name and trademarks 1.8 6 (2 ) 4 Balance as of December 31, 2020 $ 132 $ (58 ) $ 74 Intangible assets, net consisted of the following as of September 30, 2021 (in millions): Weighted- Gross Accumulated Net Carrying Existing technology 7.2 $ 71 $ (51 ) $ 20 Vendor relationships 11.1 45 (6 ) 39 Courier relationships — 1 (1 ) — Customer relationships 1.1 9 (6 ) 3 Trade name and trademarks 1.1 6 (4 ) 2 Balance as of September 30, 2021 $ 132 $ (68 ) $ 64	Intangible assets, net consisted of the following as of December 31, 2019 (in millions): Weighted- Gross Carrying Accumulated Net Carrying Existing technology 1.4 $ 49 $ (6 ) $ 43 Vendor relationships 12.8 45 (1 ) 44 Courier relationships 1.3 1 — 1 Customer relationships 2.8 9 — 9 Trade name and trademarks 2.8 6 — 6 Balance as of December 31, 2019 $ 110 $ (7 ) $ 103 Intangible assets, net consisted of the following as of year ended December 31, 2020 (in millions): Weighted- (in years) Gross Carrying Accumulated Net Carrying Existing technology 7.6 $ 71 $ (48 ) $ 23 Vendor relationships 11.8 45 (4 ) 41 Courier relationships 0.3 1 (1 ) — Customer relationships 1.8 9 (3 ) 6 Trade name and trademarks 1.8 6 (2 ) 4 Balance as of December 31, 2020 $ 132 $ (58 ) $ 74
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense	The estimated future amortization expense of intangible assets as of September 30, 2021 was as follows (in millions): Year Ending December 31, Amortization Remainder of 2021 $ 3 2022 10 2023 6 2024 6 2025 6 Thereafter 33 Total estimated future amortization expense $ 64	The estimated future amortization expense of intangible assets as of December 31, 2020 was as follows (in millions): Year Ending December 31, Amortization 2021 $ 13 2022 10 2023 6 2024 6 2025 6 Thereafter 33 Total estimated future amortization expense $ 74

Fair Value Measures and Disclos

Fair Value Measures and Disclosures (Tables)	9 Months Ended	12 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Fair Value Disclosures [Abstract]
Fair Value, Assets Measured on Recurring Basis	The following tables set forth the Company’s cash equivalents and marketable securities that were measured at fair value on a recurring basis by level within the fair value hierarchy (in millions): December 31, 2020 Level 1 Level 2 Level 3 Total Cash equivalents U.S. Treasury securities $ — $ 3 $ — $ 3 Short-term marketable securities Commercial paper — 76 — 76 Corporate bonds — 51 — 51 U.S. government agency securities — 23 — 23 U.S. Treasury securities — 364 — 364 Total $ — $ 517 $ — $ 517 September 30, 2021 Level 1 Level 2 Level 3 Total Cash equivalents Money market funds $ 996 $ — $ — $ 996 U.S. Treasury securities — 148 — 148 Short-term marketable securities Commercial paper — 414 — 414 Corporate bonds — 118 — 118 U.S. government agency securities — 69 — 69 U.S. Treasury securities — 698 — 698 Long-term marketable securities Corporate bonds — 158 — 158 U.S. government agency securities — 10 — 10 U.S. Treasury securities — 386 — 386 Total $ 996 $ 2,001 $ — $ 2,997	The following tables set forth the Company’s financial instruments that were measured at fair value on a recurring basis by level within the fair value hierarchy (in millions): December 31, 2019 Level 1 Level 2 Level 3 Total Cash equivalents Corporate bonds $ — $ 2 $ — $ 2 Short-term marketable securities Commercial paper — 8 — 8 Corporate bonds — 110 — 110 U.S. government agency securities — 43 — 43 U.S. Treasury securities — 347 — 347 Total $ — $ 510 $ — $ 510 December 31, 2020 Level 1 Level 2 Level 3 Total Cash equivalents U.S. Treasury securities $ — $ 3 $ — $ 3 Short-term marketable securities Commercial paper — 76 — 76 Corporate bonds — 51 — 51 U.S. government agency securities — 23 — 23 U.S. Treasury securities — 364 — 364 Total $ — $ 517 $ — $ 517

Balance Sheet Components (Table

Balance Sheet Components (Tables)	9 Months Ended	12 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Balance Sheet Related Disclosures [Abstract]
Cash Equivalents and Marketable Securities	The following tables summarize the cost or amortized cost, gross unrealized gain, gross unrealized loss, and fair value of the Company’s cash equivalents and marketable securities (in millions): December 31, 2020 Cost or Unrealized Estimated Gains Losses Cash equivalents U.S. Treasury securities $ 3 $ — $ — $ 3 Short-term marketable securities Commercial paper 76 — — 76 Corporate bonds 51 — — 51 U.S. government agency securities 23 — — 23 U.S. Treasury securities 364 — — 364 Total $ 517 $ — $ — $ 517 September 30, 2021 Cost or Unrealized Estimated Gains Losses Cash equivalents Money market funds $ 996 $ — $ — $ 996 U.S. Treasury securities 148 — — 148 Short-term marketable securities Commercial paper 414 — — 414 Corporate bonds 118 — — 118 U.S. government agency securities 69 — — 69 U.S. Treasury securities 698 — — 698 Long-term marketable securities Corporate bonds 158 — — 158 U.S. government agency securities 10 — — 10 U.S. Treasury securities 386 — — 386 Total $ 2,997 $ — $ — $ 2,997	The following tables summarize the cost or amortized cost, gross unrealized gain, gross unrealized loss, and fair value of the Company’s cash equivalents and marketable securities (in millions): December 31, 2019 Cost or Unrealized Estimated Gains Losses Cash equivalents Corporate bonds $ 1 $ 1 $ — $ 2 Short-term marketable securities Commercial paper 8 — — 8 Corporate bonds 110 — — 110 U.S. government agency securities 43 — — 43 U.S. Treasury securities 347 — — 347 Total $ 509 $ 1 $ — $ 510 December 31, 2020 Cost or Unrealized Estimated Gains Losses Cash equivalents U.S. Treasury securities $ 3 $ — $ — $ 3 Short-term marketable securities Commercial paper 76 — — 76 Corporate bonds 51 — — 51 U.S. government agency securities 23 — — 23 U.S. Treasury securities 364 — — 364 Total $ 517 $ — $ — $ 517
Schedule of Property and Equipment, net	Property and equipment, net consisted of the following (in millions): December 31, September 30, Equipment for merchants $ 111 $ 147 Capitalized software and website development costs 86 226 Leasehold improvements 57 83 Computer equipment and software 22 39 Office equipment 11 19 Construction in progress 27 42 Total 314 556 Less: Accumulated depreciation and amortization (104 ) (201 ) Property and equipment, net $ 210 $ 355	useful lives are as follows: Estimated Useful Life Equipment for merchants 2 years Computer equipment and software 2 years Office equipment 5 years Capitalized software and website development costs 2 years Leasehold improvements Shorter of estimated useful life or lease term Property and equipment, net consisted of the following (in millions): December 31, December 31, Equipment for merchants $ 55 $ 111 Computer equipment and software 12 22 Capitalized software and website development costs 25 86 Leasehold improvements 31 57 Office equipment 7 11 Construction in progress 10 27 Total 140 314 Less: Accumulated depreciation and amortization (39 ) (104 ) Property and equipment, net $ 101 $ 210
Schedule of Accrued Expenses and Other Current Liabilities	Accrued expenses and other current liabilities consisted of the following (in millions): December 31, September 30, Litigation reserves $ 178 $ 114 Sales tax payable and accrued sales and indirect taxes 149 152 Accrued operations related expenses 139 145 Dasher and merchant payable 110 177 Contract liabilities 108 124 Accrued advertising 62 172 Insurance reserves 55 123 Credits issued to consumers 28 35 Other 114 184 Total $ 943 $ 1,226	Accrued expenses and other current liabilities consisted of the following (in millions): December 31, December 31, Litigation reserves $ 99 $ 178 Sales tax payable and accrued sales and indirect taxes 51 149 Accrued operations related expenses 40 139 Accrued advertising 24 62 Dasher and merchant payable 27 110 Credits issued to consumers 14 28 Insurance reserves 15 55 Contract liabilities 13 108 Other 62 114 Total $ 345 $ 943

Leases (Tables)

Leases (Tables)	12 Months Ended
	Dec. 31, 2020
Leases [Abstract]
Lease Cost	The components of lease costs related to the Company’s operating leases included in the consolidated statements of operations for the periods presented were as follows (in millions): Year Ended December 31, 2019 2020 Operating lease cost $ 22 $ 40 Short-term lease cost 10 11 Sublease income (3 ) (5 ) Total lease cost $ 29 $ 46 Lease terms and discount rates for operating leases were as follows: December 31, December 31, Weighted-average remaining lease term (in years) 10.2 10.7 Weighted-average discount rate 7.12 % 8.06 % Supplemental cash flow and non-cash Year Ended December 31, 2019 2020 Cash paid for amounts included in the measurement of lease liabilities Operating cash flows for operating leases $ 12 $ 32 Financing cash flows for finance leases $ 1 $ — ROU assets obtained in exchange for new lease liabilities Operating leases $ 137 $ 69
Future Minimum Lease Payments Required under Operating Leases	As of December 31, 2020, the future minimum lease payments required under operating leases were as follows (in millions): Year Ending December 31, Amount 2021 $ 36 2022 46 2023 46 2024 44 2025 42 Thereafter 319 Total future minimum lease payments 533 Less: Lease not commenced (120 ) Less: Imputed interest (145 ) Less: Tenant improvement receivable (15 ) Present value of future minimum lease payments $ 253

Commitments And Contingencies (

Commitments And Contingencies (Tables)	12 Months Ended
	Dec. 31, 2020
Commitments and Contingencies Disclosure [Abstract]
Schedule of noncancelable purchase commitments	As of December 31, 2020, the future minimum payments under the Company’s non-cancelable Year Ending December 31, Amount 2021 $ 119 2022 112 2023 104 2024 79 2025 2 Total future minimum payments $ 416

Redeemable Convertible Prefer_2

Redeemable Convertible Preferred Stock (Tables)	12 Months Ended
	Dec. 31, 2020
Temporary Equity Disclosure [Abstract]
Schedule of Redeemable Convertible Preferred Stock	The following table summarizes the redeemable convertible preferred stock outstanding immediately prior to the conversion into common stock, and the rights and preferences of the Company’s respective series preceding the Company’s IPO in December 2020 (in millions, except share amounts which are reflected in thousands, and per share data): Series Shares Shares Issuance Price Per Share Aggregate Carrying Series A-1 13,330 13,330 $ 0.15 $ 0.15 $ 2 $ 7 Series A 27,159 27,159 0.73 0.73 20 20 Series B 7,925 7,925 5.68 5.48 45 45 Series C 26,839 26,839 4.79 4.79 128 128 Series D 98,008 98,008 5.51 (1) 5.51 540 535 Series E 18,055 18,055 13.85 13.85 250 250 Series F 18,186 18,186 22.48 22.48 409 476 Series G 21,165 21,165 37.94 37.94 803 803 Series H 9,351 8,316 45.91 45.91 382 382 Total 240,018 238,983 $ 2,579 $ 2,646 (1) The issuance price for Series D redeemable convertible preferred stock was $5.50688, except for shares issued via the conversion of certain of the outstanding convertible promissory notes issued in 2017, for which the conversion price was $4.78778 per share.
Schedule of Fair Value of the Liability (Valued as a Forward Contract)	The fair value of the liability (valued as a forward contract) at issuance and as of subsequent closing was determined with the following assumptions: As of As of Current forward price per share $ 22.48 $ 37.76 Contractual forward price per share $ 22.48 $ 22.48 Risk-free rate 2.46 % 2.41 % Expected years until subsequent closing 0.23 — Present value of contractual forward price per share $ 22.35 $ 22.48 Value of the forward contract per share $ 0.13 $ 15.28 Number of preferred shares issued in the subsequent closing 4,449,370 4,449,370 Fair value of forward contract liability (in millions) $ 1 $ 68

Common Stock (Tables)

Common Stock (Tables)	9 Months Ended	12 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Equity [Abstract]
Schedule of Common Stock Reserved for Future Issuance on an As-converted Basis		The following table summarizes the Company’s shares of common stock reserved for future issuance on an as-converted December 31, December 31, Conversion of outstanding redeemable convertible preferred stock 230,953 — Stock options issued and outstanding under the 2014 Plan 36,247 33,802 RSUs outstanding under the 2014 and 2020 Plan 15,924 34,939 Remaining shares available for future issuance 10,478 32,210 Shares available for issuance under the 2020 Employee Stock Purchase Plan — 6,499 Total 293,602 107,450
Schedule of Non-vested Performance Shares		Company Stock Number of RSUs 1 $ 187.60 518,950 2 $ 226.80 518,950 3 $ 265.80 1,037,900 4 $ 305.00 1,037,900 5 $ 344.00 1,037,900 6 $ 383.00 1,556,850 7 $ 422.20 1,556,850 8 $ 461.20 1,556,850 9 $ 501.00 1,556,850
Schedule of Activity under the 2014 and 2020 Plans	A summary of activity under the 2014 and 2020 Plan and related information was as follows (in millions, except share amounts which are reflected in thousands, and per share data): Options Outstanding Shares Weighted- Weighted- Aggregate Balance as of December 31, 2020 33,802 $ 2.42 5.92 $ 4,744 Granted — $ — Exercised (12,346 ) $ 2.27 $ 1,880 Forfeited (28 ) $ 2.98 Balance as of September 30, 2021 21,428 $ 2.51 4.87 $ 4,359 Exercisable as of September 30, 2021 19,231 $ 2.07 4.64 $ 3,921 Vested and expected to vest as of September 30, 2021 21,428 $ 2.51 4.87 $ 4,359	A summary of activity under the 2014 and 2020 Plan and related information was as follows (in millions, except share amounts which are reflected in thousands, and per share data): Options Outstanding Shares Shares Weighted- Weighted- Aggregate Balance as of December 31, 2019 10,478 36,247 $ 2.38 6.92 $ 1,070 Shares authorized 40,493 — Options granted — — $ — Options exercised — (2,191 ) $ 1.90 129 Options forfeited 254 (254 ) $ 1.94 RSUs granted (20,126 ) — RSUs forfeited 1,046 — Shares withheld related to net share settlement, returned to the 2020 Plan 65 Balance as of December 31, 2020 32,210 33,802 $ 2.42 5.92 $ 4,744 Exercisable as of December 31, 2020 28,291 $ 1.95 5.61 $ 3,983 Vested and expected to vest as of December 31, 2020 33,802 $ 2.42 5.92 $ 4,744
Summary of RSU Activity	The summary of RSU activity was as follows (in millions, except share amounts which are reflected in thousands, and per share data): Number of Weighted- Aggregate Unvested units as of December 31, 2020 28,366 $ 4,049 Granted 6,545 $ 166.87 Vested (47 ) $ 105.26 Vested and settled (5,852 ) $ 50.34 Forfeited (909 ) $ 72.89 Unvested units as of September 30, 2021 28,103 $ 5,789	The summary of RSU activity was as follows (in millions, except share amounts which are reflected in thousands, and per share data): Number of Weighted- Aggregate Unvested units as of December 31, 2019 15,924 $ 508 Granted 20,126 $ 56.27 Vested (6,573 ) $ 17.40 Vested and settled (65 ) $ 10.68 Forfeited (1,046 ) $ 29.14 Unvested units as of December 31, 2020 28,366 $ 4,049
Schedule of Assumptions used to Estimate the Fair Value of Stock Options Granted		The assumptions used to estimate the fair value of stock options granted for the periods presented were as follows: Year Ended December 31, 2018 2019 2020 Expected volatility 54.10% - 57.64% 53.73% - 53.85% — Risk-free rate 2.49% - 3.08% 2.35% - 2.36% — Dividend yield — — — Expected term (in years) 5.00 - 6.10 5.91 - 6.03 —
Schedule of Stock-based compensation Expense	The Company recorded stock-based compensation expense in the condensed consolidated statements of operations as follows (in millions): Three Months Ended Nine Months Ended 2020 2021 2020 2021 Cost of revenue, exclusive of depreciation and amortization $ — $ 13 $ 1 $ 34 Sales and marketing — 14 1 38 Research and development 2 47 5 129 General and administrative 1 48 4 156 Total stock-based compensation expense $ 3 $ 122 $ 11 $ 357	The Company recorded stock-based compensation expense in the consolidated statements of operations as follows (in millions): Year Ended December 31, 2018 2019 2020 Cost of revenue, exclusive of depreciation and amortization $ 3 $ 2 $ 31 Sales and marketing 3 2 37 Research and development 11 8 171 General and administrative 7 6 83 Total stock-based compensation expense $ 24 $ 18 $ 322

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2020
Income Tax Disclosure [Abstract]
Schedule of Income before Income Tax, Domestic and Foreign	U.S. and foreign components of consolidated income (loss) before income taxes was as follows (in millions): Year Ended December 31, 2018 2019 2020 United States $ (204 ) $ (666 ) $ (463 ) Foreign — — 5 Loss before income taxes $ (204 ) $ (666 ) $ (458 )
Schedule of Effective Income Tax Rate Reconciliation	The reconciliation of the statutory federal income tax rate to the Company’s effective tax rate was as follows: Year Ended December 31, 2018 2019 2020 Federal tax (benefit) at statutory rate 21 % 21 % 21 % State tax (benefit) at statutory rate, net of federal benefit 4 4 3 Change in valuation allowance (25 ) (23 ) (21 ) Stock-based compensation (1 ) — (2 ) Research and development credits 1 1 3 Change in fair value of forward contract liability — (3 ) — Non-deductible — — (3 ) Non-deductible — — (2 ) Provision for income taxes — % — % (1 )%
Schedule of Deferred Tax Assets and Liabilities	The significant components of the Company’s deferred tax assets and liabilities were as follows (in millions): December 31, 2019 2020 Deferred tax assets Accruals and reserves $ 44 $ 95 Stock-based compensation 5 72 Tax credits carryforward 12 23 Operating leases 46 64 Net operating losses carryforward 200 180 Total gross deferred tax assets 307 434 Less: Valuation allowance (260 ) (357 ) Total deferred tax assets net of valuation allowance 47 77 Deferred tax liabilities Property and equipment and intangible assets — (19 ) ROU assets (42 ) (51 ) Deferred contract costs (5 ) (10 ) Total gross deferred tax liabilities (47 ) (80 ) Net deferred tax liabilities $ — $ (3 )
Schedule of Unrecognized Tax Benefits Roll Forward	A reconciliation of the beginning and ending balance of gross unrecognized tax benefits is included in the table below (in millions): Year Ended December 31, 2018 2019 2020 Unrecognized tax benefits at beginning of year $ 1 $ 3 $ 7 Increases related to current year tax positions 2 4 3 Decreases related to prior year tax positions — — (3 ) Unrecognized tax benefits at end of year $ 3 $ 7 $ 7

Net Loss per Share Attributab_2

Net Loss per Share Attributable to Common Stockholders (Tables)	9 Months Ended	12 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Earnings Per Share [Abstract]
Schedule of Earnings Per Share, Basic and Diluted	The following table sets forth the calculation of basic and diluted net loss per share attributable to common stockholders during the periods presented. RSUs that vested but have not been settled are included in the denominator in calculating net loss per share for the three and nine months ended September 30, 2021 (in millions, except share amounts which are reflected in thousands, and per share data): Three Months Ended Nine Months Ended September 30, 2020 2021 2020 2021 Common Class A Class B Common Class A Class B Net loss $ (43 ) $ (92 ) $ (9 ) $ (149 ) $ (284 ) $ (29 ) Weighted-average number of shares outstanding used to compute net loss per share, basic and diluted 45,016 308,797 31,372 44,568 302,954 31,323 Net loss per share, basic and diluted $ (0.96 ) $ (0.30 ) $ (0.30 ) $ (3.34 ) $ (0.94 ) $ (0.94 )	The following table sets forth the calculation of basic and diluted net loss per share attributable to common stockholders during the periods presented. The shares issued in the IPO and the shares of Class A common stock issued upon conversion of the outstanding shares of redeemable convertible preferred stock in the IPO, as well as vested RSUs that have not been settled are included in the table below weighted for the period outstanding in the year ended December 31, 2020 (in millions, except share amounts which are reflected in thousands, and per share data): Year Ended December 31, 2018 2019 2020 Common Common Class A Class B Net loss $ (204 ) $ (667 ) $ (446 ) $ (15 ) Less: Premium paid on repurchase of redeemable convertible preferred stock (3 ) — — — Less: Deemed dividend to preferred stockholders — (1 ) — — Net loss attributable to common stockholders $ (207 ) $ (668 ) $ (446 ) $ (15 ) Weighted-average number of shares outstanding used to compute net loss per share attributable to common stockholders, basic and diluted 44,305 43,252 60,422 1,968 Net loss per share attributable to common stockholders, basic and diluted $ (4.67 ) $ (15.44 ) $ (7.39 ) $ (7.39 )
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share	The following outstanding shares of potentially dilutive securities were excluded from the computation of diluted net loss per share because including them would have had an anti-dilutive effect, or issuance of such shares is contingent upon the satisfaction of certain performance or market conditions which were not satisfied at the end of the respective periods (in thousands): As of September 30, 2020 2021 Redeemable convertible preferred stock (on an as-converted 239,275 — Stock options to purchase common stock 34,554 21,428 Unvested restricted stock units 20,021 28,103 Convertible promissory notes 5,778 — Total 299,628 49,531	The following outstanding shares of potentially dilutive securities were excluded from the computation of diluted net loss per share because including them would have had an anti-dilutive effect (in thousands): Year Ended December 31, 2018 2019 2020 Redeemable convertible preferred stock (on an as-converted 191,602 230,953 — Stock options to purchase common stock 39,191 36,247 33,802 Unvested restricted stock units (1) 6,065 15,924 17,987 Common stock subject to repurchase 25 — — Convertible promissory notes — — 2,595 Total 236,883 283,124 54,384 (1) The CEO Performance Award is excluded from the above table because the Company Stock Price Target had not been met as of December 31, 2020.

Organization, Consolidation and

Organization, Consolidation and Presentation of Financial Statements (Details) $ / shares in Units, $ in Millions	Nov. 09, 2021USD ($)	Dec. 08, 2020shares	Nov. 09, 2020	Sep. 12, 2020USD ($)$ / sharesshares	Sep. 30, 2021USD ($)shares	Sep. 30, 2020USD ($)	Sep. 30, 2021USD ($)shares	Sep. 30, 2020USD ($)	Dec. 31, 2020USD ($)shares	Dec. 31, 2019USD ($)shares	Dec. 31, 2018USD ($)
Preferred stock, authorized (shares)				600,000,000
Total stock-based compensation expense | $					$ 122	$ 3	$ 357	$ 11	$ 322	$ 18	$ 24
Settlement period required prior to issuance of common stock for RSUs				180 days
Shares withheld related to net share settlement (shares)										65,000
Forward stock split ratio			5
Shares withheld related to net share settlement | $							$ 172		7	$ 0	$ 0
Employee Member
Short-term loan extended to employees | $									$ 10
Unvested restricted stock units
Total stock-based compensation expense | $	$ 279			$ 279
Class A Common Stock
Shares issued upon conversion of outstanding redeemable convertible preferred stock (shares)				239,000,000
Common stock, authorized (shares)				6,000,000,000	6,000,000,000		6,000,000,000		6,000,000,000	360,000,000
Common stock, shares converted (shares)				285,000,000
Shares withheld related to net share settlement (shares)				65,058
Common stock, shares issued upon conversion (shares)		239,269,631
Shares withheld related to net share settlement | $				$ 7
Class B Common Stock
Common stock, authorized (shares)				200,000,000	200,000,000		200,000,000		200,000,000	0
Common stock, shares issued upon conversion (shares)				31,000,000
Class C Common Stock
Common stock, authorized (shares)				2,000,000,000	2,000,000,000		2,000,000,000		2,000,000,000	0
IPO [Member] | Class A Common Stock
Shares issued in initial public offering (shares)				33,000,000
Sale of stock, price per share | $ / shares				$ 102
Proceeds from issuance in IPO | $				$ 3,300

Summary of Significant Accoun_4

Summary of Significant Accounting Policies (Details)	Nov. 09, 2021USD ($)	Sep. 12, 2020USD ($)shares	Nov. 30, 2021	Sep. 30, 2021USD ($)shares	Sep. 30, 2020USD ($)	Sep. 30, 2021USD ($)shares	Sep. 30, 2020USD ($)	Dec. 31, 2020USD ($)countriesshares	Dec. 31, 2019USD ($)shares	Dec. 31, 2018USD ($)	Dec. 08, 2020shares
Change in estimate of breakage revenue				$ 36,000,000
Number of reportable segments | segment | countries								1
Bad debt expense						$ 31,000,000		$ 16,000,000
Direct write-offs of uncollectible accounts								5,000,000
Allowance for doubtful accounts				39,000,000		39,000,000		13,000,000	$ 2,000,000
Goodwill, impairment loss								0	$ 0	$ 0
Operating lease impairment charge						1,000,000	$ 11,000,000	$ 11,000,000
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate								0.00%	0.00%	0.00%
Share-based Payment Arrangement, Expense				$ 122,000,000	$ 3,000,000	$ 357,000,000	$ 11,000,000	$ 322,000,000	$ 18,000,000	$ 24,000,000
Advertising Expense								$ 698,000,000	$ 446,000,000	$ 81,000,000
Temporary Equity, Shares Outstanding | shares								0	230,667,000
Other Assets [Member] | IPO [Member]
Deferred Offering Costs									$ 5,000,000
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Customer One [Member]
Concentration Risk, Percentage								20.00%	26.00%
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Customer Two [Member]
Concentration Risk, Percentage								14.00%	11.00%
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Customer Three [Member]
Concentration Risk, Percentage								10.00%
Stock options to purchase common stock
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period								4 years
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period			4 years					4 years
Share-based Payment Arrangement, Expense	$ 279,000,000	$ 279,000,000
International
Long-lived assets								$ 21,000,000
Minimum [Member]
Contract With Customer Revenue Recognition Period								1 month
Lessee, Operating Lease, Term of Contract								1 year
Lessee Operating Lease Sublease Term Of Contract								4 years
Maximum [Member]
Contract With Customer Revenue Recognition Period								1 year
Lessee, Operating Lease, Term of Contract								15 days
Lessee Operating Lease Sublease Term Of Contract								5 years
Common Class A [Member]
Common Stock, Shares, Outstanding | shares				310,964,000		310,964,000		287,190,000	43,937,000
Common Stock, Shares, Issued | shares				310,964,000		310,964,000		287,190,000	43,937,000
Convertible Preferred Stock, Shares Issued upon Conversion | shares		239,000,000
Common Class B [Member]
Common Stock, Shares, Outstanding | shares				31,459,000		31,459,000		31,313,000	0
Common Stock, Shares, Issued | shares				31,459,000		31,459,000		31,313,000	0		0
Common Class C [Member]
Common Stock, Shares, Outstanding | shares				0		0		0	0
Common Stock, Shares, Issued | shares				0		0		0	0
Nonredeemable Convertible Preferred Stock [Member]
Temporary Equity, Shares Outstanding | shares								0

Revenue - Disaggregated Revenue

Revenue - Disaggregated Revenue (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disaggregation of Revenue [Line Items]
Total revenue	$ 1,275	$ 879	$ 3,588	$ 1,916	$ 2,886	$ 885	$ 291
Core business
Disaggregation of Revenue [Line Items]
Total revenue					2,886	876	282
Other revenue
Disaggregation of Revenue [Line Items]
Total revenue					0	9	9
United States
Disaggregation of Revenue [Line Items]
Total revenue	$ 1,275	875	3,577	1,912	2,875	877	282
International
Disaggregation of Revenue [Line Items]
Total revenue		$ 4	$ 11	$ 4	$ 11	$ 8	$ 9

Revenue - Contract Liabilities

Revenue - Contract Liabilities (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended	12 Months Ended
	Sep. 30, 2021	Sep. 30, 2021	Dec. 31, 2020
Revenue from Contract with Customer [Abstract]
Beginning balance		$ 108	$ 13
Addition to contract liabilities		815
Reduction of contract liabilities		(799)	0
Ending balance	$ 124	124	$ 108
Revenue recognized from unearned prepayments received		$ 22
Change in estimate of breakage revenue	$ 36

Revenue - Rollforward of Deferr

Revenue - Rollforward of Deferred Contract Costs (Details) - USD ($) $ in Millions	9 Months Ended		12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Capitalized Contract Cost [Roll Forward]
Beginning balance	$ 43	$ 21	$ 21	$ 6	$ 2
Capitalization of deferred contract costs	26	21	32	19	5
Amortization of deferred contract costs	(15)	(6)	(10)	(4)	(1)
Ending balance	$ 54	$ 36	$ 43	$ 21	$ 6

Revenue - Deferred Contract Cos

Revenue - Deferred Contract Costs (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020	Sep. 30, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Revenue from Contract with Customer [Abstract]
Deferred contract costs, current	$ 22	$ 16	$ 11	$ 4	$ 2
Deferred contract costs, non-current	32	27	25	17	4
Total deferred contract costs	$ 54	$ 43	$ 36	$ 21	$ 6	$ 2

Revenue - Allowance for Credit

Revenue - Allowance for Credit Losses (Details) - USD ($) $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	$ 13	$ 2
Additions to the provision for expected credit losses	31	16
Writeoffs charged against the allowance	(5)
Ending balance	$ 39	$ 13

Acquisition - Additional Inform

Acquisition - Additional Information (Details) - USD ($) $ in Millions	Oct. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2019	Sep. 30, 2021	Dec. 31, 2018
Business Acquisition [Line Items]
Goodwill		$ 316	$ 306	$ 306	$ 316	$ 0
Caviar
Business Acquisition [Line Items]
Consideration transferred	$ 411
Cash paid for acquisition	311
Transaction costs	1
Acquisition-related costs				5
Indemnification asset	3
Estimable legal settlement	3
Revenue included in consolidated statements of operations				15
Intangible assets	106
Goodwill	305
Consideration recorded in accrued expenses and other current liabilities	3
Caviar | Series G Redeemable Convertible Preferred Stock [Member]
Business Acquisition [Line Items]
Redeemable convertible preferred stock issued in connection with an acquisition	$ 100
Scotty Labs, Inc.
Business Acquisition [Line Items]
Consideration transferred				5
Intangible assets			4	$ 4
Estimated useful life				2 years
Goodwill			1	$ 1
Technology Manufacturing Company
Business Acquisition [Line Items]
Consideration transferred			$ 30
Intangible assets		$ 22
Estimated useful life		8 years
Goodwill		$ 10
Consideration recorded in accrued expenses and other current liabilities		$ 3

Acquisitions - Assets Acquired

Acquisitions - Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020	Dec. 31, 2019	Oct. 31, 2019	Dec. 31, 2018
Business Acquisition [Line Items]
Goodwill	$ 316	$ 316	$ 306		$ 0
Caviar [Member]
Business Acquisition [Line Items]
Prepaid expenses and other current assets				$ 4
Intangible assets				106
Goodwill				305
Accrued expenses and other current liabilities				(3)
Other liabilities				(1)
Total purchase price				$ 411

Acquisitions - Identifiable Int

Acquisitions - Identifiable Intangible Assets Acquired (Details) - Caviar [Member] $ in Millions	Oct. 31, 2019USD ($)
Acquired Finite-Lived Intangible Assets [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill	$ 106
Existing Technology
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	1 year 6 months
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill	$ 45
Vendor Relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	13 years
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill	$ 45
Courier Relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	1 year 6 months
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill	$ 1
Customer Relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	3 years
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill	$ 9
Trade Name and Trademarks
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	3 years
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill	$ 6

Acquisitions - Pro Forma Inform

Acquisitions - Pro Forma Information (Details) - Caviar [Member] - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Revenue	$ 971	$ 361
Net loss	$ (726)	$ (291)

Goodwill and Intangible Asset_3

Goodwill and Intangible Assets, Net - Goodwill (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill, Beginning Balance	$ 306,000,000	$ 0
Acquisitions	10,000,000	306,000,000
Goodwill, Ending Balance	316,000,000	306,000,000	$ 0
Goodwill, impairment loss	$ 0	$ 0	$ 0

Goodwill and Intangible Asset_4

Goodwill and Intangible Assets, Net - Intangible Assets (Details) - USD ($) $ in Millions	Feb. 29, 2020	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value		$ 132		$ 132		$ 132	$ 110
Accumulated Amortization		(68)		(68)		(58)	(7)
Net Carrying Value		64		64		74	103
Amortization of intangible assets		3	$ 15	$ 10	$ 44	$ 51	$ 7	$ 0
Existing Technology
Finite-Lived Intangible Assets [Line Items]
Weighted-average Remaining Useful Life (in years)				7 years 2 months 12 days		7 years 7 months 6 days	1 year 4 months 24 days
Gross Carrying Value		71		$ 71		$ 71	$ 49
Accumulated Amortization		(51)		(51)		(48)	(6)
Net Carrying Value		20		$ 20		23	$ 43
Existing Technology | Caviar
Finite-Lived Intangible Assets [Line Items]
Weighted-average Remaining Useful Life (in years)	8 months 12 days
Amortization of intangible assets						$ 15
Vendor Relationships
Finite-Lived Intangible Assets [Line Items]
Weighted-average Remaining Useful Life (in years)				11 years 1 month 6 days		11 years 9 months 18 days	12 years 9 months 18 days
Gross Carrying Value		45		$ 45		$ 45	$ 45
Accumulated Amortization		(6)		(6)		(4)	(1)
Net Carrying Value		39		39		$ 41	$ 44
Courier Relationships
Finite-Lived Intangible Assets [Line Items]
Weighted-average Remaining Useful Life (in years)						3 months 18 days	1 year 3 months 18 days
Gross Carrying Value		1		1		$ 1	$ 1
Accumulated Amortization		(1)		(1)		(1)
Net Carrying Value		0		$ 0		$ 0	$ 1
Customer Relationships
Finite-Lived Intangible Assets [Line Items]
Weighted-average Remaining Useful Life (in years)				1 year 1 month 6 days		1 year 9 months 18 days	2 years 9 months 18 days
Gross Carrying Value		9		$ 9		$ 9	$ 9
Accumulated Amortization		(6)		(6)		(3)
Net Carrying Value		3		$ 3		$ 6	$ 9
Trade Name and Trademarks
Finite-Lived Intangible Assets [Line Items]
Weighted-average Remaining Useful Life (in years)				1 year 1 month 6 days		1 year 9 months 18 days	2 years 9 months 18 days
Gross Carrying Value		6		$ 6		$ 6	$ 6
Accumulated Amortization		(4)		(4)		(2)
Net Carrying Value		$ 2		$ 2		$ 4	$ 6

Goodwill and Intangible Asset_5

Goodwill and Intangible Assets, Net - Future Amortization Expense (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020	Dec. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract]
Remainder of 2021	$ 3
2022	10	$ 13
2023	6	10
2024	6	6
2025	6	6
2025		6
Thereafter	33
Thereafter		33
Net Carrying Value	$ 64	$ 74	$ 103

Fair Value Measures and Discl_2

Fair Value Measures and Disclosures (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020	Dec. 31, 2019
Short-term marketable securities
Short-term marketable securities	$ 1,299	$ 514	$ 508
Long-term marketable securities	554
U.S. Treasury securities
Cash equivalents
Cash equivalents	148	3
Short-term marketable securities
Short-term marketable securities	698	364	347
Long-term marketable securities	386
Commercial paper
Short-term marketable securities
Short-term marketable securities	414	76	8
Corporate bonds
Cash equivalents
Cash equivalents			2
Short-term marketable securities
Short-term marketable securities	118	51	110
Long-term marketable securities	158
U.S. government agency securities
Short-term marketable securities
Short-term marketable securities	69	23	43
Long-term marketable securities	10
Money market funds
Cash equivalents
Cash equivalents	996
Fair Value, Recurring
Short-term marketable securities
Total	2,997	517	510
Fair Value, Recurring | U.S. Treasury securities
Cash equivalents
Cash equivalents	148	3
Short-term marketable securities
Short-term marketable securities	698	364	347
Long-term marketable securities	386
Fair Value, Recurring | Commercial paper
Short-term marketable securities
Short-term marketable securities	414	76	8
Fair Value, Recurring | Corporate bonds
Cash equivalents
Cash equivalents			2
Short-term marketable securities
Short-term marketable securities	118	51	110
Long-term marketable securities	158
Fair Value, Recurring | U.S. government agency securities
Short-term marketable securities
Short-term marketable securities	69	23	43
Long-term marketable securities	10
Fair Value, Recurring | Money market funds
Cash equivalents
Cash equivalents	996
Level 1 | Fair Value, Recurring
Short-term marketable securities
Total	996	0	0
Level 1 | Fair Value, Recurring | U.S. Treasury securities
Cash equivalents
Cash equivalents	0	0
Short-term marketable securities
Short-term marketable securities	0	0	0
Long-term marketable securities	0
Level 1 | Fair Value, Recurring | Commercial paper
Short-term marketable securities
Short-term marketable securities	0	0	0
Level 1 | Fair Value, Recurring | Corporate bonds
Cash equivalents
Cash equivalents			0
Short-term marketable securities
Short-term marketable securities	0	0	0
Long-term marketable securities	0
Level 1 | Fair Value, Recurring | U.S. government agency securities
Short-term marketable securities
Short-term marketable securities	0	0	0
Long-term marketable securities	0
Level 1 | Fair Value, Recurring | Money market funds
Cash equivalents
Cash equivalents	996
Level 2 | Fair Value, Recurring
Short-term marketable securities
Total	2,001	517	510
Level 2 | Fair Value, Recurring | U.S. Treasury securities
Cash equivalents
Cash equivalents	148	3
Short-term marketable securities
Short-term marketable securities	698	364	347
Long-term marketable securities	386
Level 2 | Fair Value, Recurring | Commercial paper
Short-term marketable securities
Short-term marketable securities	414	76	8
Level 2 | Fair Value, Recurring | Corporate bonds
Cash equivalents
Cash equivalents			2
Short-term marketable securities
Short-term marketable securities	118	51	110
Long-term marketable securities	158
Level 2 | Fair Value, Recurring | U.S. government agency securities
Short-term marketable securities
Short-term marketable securities	69	23	43
Long-term marketable securities	10
Level 2 | Fair Value, Recurring | Money market funds
Cash equivalents
Cash equivalents	0
Level 3
Short-term marketable securities
Liabilities	0	0
Level 3 | Fair Value, Recurring
Short-term marketable securities
Total	0	0	0
Level 3 | Fair Value, Recurring | U.S. Treasury securities
Cash equivalents
Cash equivalents	0	0
Short-term marketable securities
Short-term marketable securities	0	0	0
Long-term marketable securities	0
Level 3 | Fair Value, Recurring | Commercial paper
Short-term marketable securities
Short-term marketable securities	0	0	0
Level 3 | Fair Value, Recurring | Corporate bonds
Cash equivalents
Cash equivalents			0
Short-term marketable securities
Short-term marketable securities	0	0	0
Long-term marketable securities	0
Level 3 | Fair Value, Recurring | U.S. government agency securities
Short-term marketable securities
Short-term marketable securities	0	$ 0	$ 0
Long-term marketable securities	0
Level 3 | Fair Value, Recurring | Money market funds
Cash equivalents
Cash equivalents	$ 0

Balance Sheet Components - Cash

Balance Sheet Components - Cash Equivalents and Marketable Securities (Details) $ in Millions	Sep. 30, 2021USD ($)security	Dec. 31, 2020USD ($)security	Sep. 30, 2020USD ($)	Dec. 31, 2019USD ($)countries	Dec. 31, 2018USD ($)
Cash equivalents
Cash equivalents, cost or amortized cost	$ 2,861	$ 4,345	$ 1,096	$ 257	$ 215
Short-term marketable securities
Short-term marketable securities, estimated fair value	1,299	514		508
Long-term marketable securities
Long-term marketable securities, estimated fair value	554
Total	2,997	517		509
Total, unrealized gains	0	0		1
Total, unrealized losses	0	0		0
Total, estimated fair value	$ 2,997	$ 517		$ 510
Number of individual securities that incurred continuous unrealized losses for greater than 12 months	0	0		0
Finance Lease, Right-of-Use Asset, before Accumulated Amortization		$ 0		$ 4
Money market funds
Cash equivalents
Cash equivalents, cost or amortized cost	$ 996
Cash equivalents, unrealized gain	0
Cash equivalents paper, unrealized loss	0
Cash equivalents, estimated fair value	996
U.S. Treasury securities
Cash equivalents
Cash equivalents, cost or amortized cost	148	3
Cash equivalents, unrealized gain	0	0
Cash equivalents paper, unrealized loss	0	0
Cash equivalents, estimated fair value	148	3
Short-term marketable securities
Short-term marketable securities, cost or amortized cost	698	364		347
Short-term marketable securities, unrealized gains	0	0		0
Short-term marketable securities, unrealized losses	0	0		0
Short-term marketable securities, estimated fair value	698	364		347
Long-term marketable securities
Long-term marketable securities, cost or amortized cost	386
Long-term marketable securities, unrealized gains	0
Long-term marketable securities, unrealized losses	0
Long-term marketable securities, estimated fair value	386
Commercial paper
Short-term marketable securities
Short-term marketable securities, cost or amortized cost	414	76		8
Short-term marketable securities, unrealized gains	0	0		0
Short-term marketable securities, unrealized losses	0	0		0
Short-term marketable securities, estimated fair value	414	76		8
Corporate bonds
Cash equivalents
Cash equivalents, cost or amortized cost				1
Cash equivalents, unrealized gain				1
Cash equivalents paper, unrealized loss				0
Cash equivalents, estimated fair value				2
Short-term marketable securities
Short-term marketable securities, cost or amortized cost	118	51		110
Short-term marketable securities, unrealized gains	0	0		0
Short-term marketable securities, unrealized losses	0	0		0
Short-term marketable securities, estimated fair value	118	51		110
Long-term marketable securities
Long-term marketable securities, cost or amortized cost	158
Long-term marketable securities, unrealized gains	0
Long-term marketable securities, unrealized losses	0
Long-term marketable securities, estimated fair value	158
U.S. government agency securities
Short-term marketable securities
Short-term marketable securities, cost or amortized cost	69	23		43
Short-term marketable securities, unrealized gains	0	0		0
Short-term marketable securities, unrealized losses	0	0		0
Short-term marketable securities, estimated fair value	69	$ 23		$ 43
Long-term marketable securities
Long-term marketable securities, cost or amortized cost	10
Long-term marketable securities, unrealized gains	0
Long-term marketable securities, unrealized losses	0
Long-term marketable securities, estimated fair value	$ 10

Balance Sheet Components - Prop

Balance Sheet Components - Property and Equipment, Net (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Property, Plant and Equipment [Line Items]
Total	$ 556		$ 556		$ 314	$ 140
Less: Accumulated depreciation and amortization	(201)		(201)		(104)	(39)
Property and equipment, net	355		355		210	101
Depreciation expense	20	$ 14	58	$ 35	52	20	$ 6
Capitalized software and website development costs	50	15	140	38	61	15	4
Amortization of capitalized software and website development costs	18	$ 5	39	$ 10	17	5	$ 3
Equipment for merchants
Property, Plant and Equipment [Line Items]
Total	147		147		111	55
Capitalized software and website development costs
Property, Plant and Equipment [Line Items]
Total	226		226		86	25
Leasehold improvements
Property, Plant and Equipment [Line Items]
Total	83		83		57	31
Computer equipment and software
Property, Plant and Equipment [Line Items]
Total	39		39		22	12
Office equipment
Property, Plant and Equipment [Line Items]
Total	19		19		11	7
Construction in progress
Property, Plant and Equipment [Line Items]
Total	$ 42		$ 42		$ 27	$ 10

Balance Sheet Components - Accr

Balance Sheet Components - Accrued Expenses and Other Current Liabilities (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020	Dec. 31, 2019
Balance Sheet Related Disclosures [Abstract]
Litigation reserves	$ 114	$ 178	$ 99
Sales tax payable and accrued sales and indirect taxes	152	149	51
Accrued operations related expenses	145	139	40
Dasher and merchant payable	177	110	27
Contract liabilities	124	108	13
Accrued advertising	172	62	24
Insurance reserves	123	55	15
Credits issued to consumers	35	28	14
Other	184	114	62
Total	$ 1,226	$ 943	$ 345

Leases (Details)

Leases (Details) - USD ($) $ in Millions	Jun. 30, 2019	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Leases [Abstract]
Rent expense, net of sublease income				$ 46	$ 29	$ 10
Sublease rental income as a percent of lease expense	100.00%
Operating lease impairment charge		$ 1	$ 11	11
Leases not yet commenced				$ 120	$ 246

Leases - Components of Lease Co

Leases - Components of Lease Cost (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Leases [Abstract]
Operating lease cost	$ 40	$ 22
Short-term lease cost	11	10
Sublease income	(5)	(3)
Total lease cost	$ 46	$ 29
Weighted-average remaining lease term (in years)	10 years 8 months 12 days	10 years 2 months 12 days
Weighted average discount rate (percent)	8.06%	7.12%
Cash paid for amounts included in the measurement of lease liabilities
Operating cash flows for operating leases	$ 32	$ 12
Financing cash flows for finance leases	0	1
ROU assets obtained in exchange for new lease liabilities
Operating leases	$ 69	$ 137

Leases - Future Minimum Lease P

Leases - Future Minimum Lease Payments under Operating Leases (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Leases [Abstract]
2021	$ 36
2022	46
2023	46
2024	44
2025	42
Thereafter	319
Total future minimum lease payments	533
Less: Lease not commenced	(120)	$ (246)
Less: Imputed interest	(145)
Less: Tenant improvement receivable	(15)
Present value of future minimum lease payments	$ 253

Promissory Notes (Details)

Promissory Notes (Details) $ in Millions	1 Months Ended		3 Months Ended		9 Months Ended		12 Months Ended
	Feb. 28, 2021USD ($)	Feb. 29, 2020USD ($)Daycountries	Sep. 30, 2021USD ($)	Sep. 30, 2020USD ($)	Sep. 30, 2021USD ($)	Sep. 30, 2020USD ($)	Dec. 31, 2020USD ($)investor	Dec. 31, 2019USD ($)	Dec. 31, 2018USD ($)shares	Oct. 31, 2019USD ($)	Dec. 31, 2017USD ($)investor
Debt Instrument [Line Items]
General and administrative			$ 188	$ 167	$ 573	$ 337	$ 556	$ 245	$ 78
Proceeds from issuance of convertible notes, net of issuance costs						$ 333	333	0	$ 0
Promissory Note Issued to Not-for-Profit Organization
Debt Instrument [Line Items]
General and administrative							29	$ 1
Promissory note receivable										$ 30
Promissory Note Issued to Not-for-Profit Organization | Prepaid Expenses and Other Current Assets
Debt Instrument [Line Items]
Promissory note receivable							0			$ 29
Convertible Promissory Notes | 2020 Convertible Promissory Notes
Debt Instrument [Line Items]
Debt issued		$ 340
Proceeds from issuance of convertible notes, net of issuance costs		333
Debt issuance costs		2
Original issue discount		$ 5					5
Stated interest rate (percent)		10.00%
Outstanding principal and accrued interest repaid	$ 375
Equity financing minimum for conversion of convertible promissory notes		$ 100
Period before automatic conversion of debt		1 year
Number of trading days following a Qualified Public Company Event for automatic conversion of debt, if latest | Day		10
Market capitalization ceiling to trigger conversion of convertible debt to non-convertible debt		$ 10,000
Market capitalization floor to trigger conversion of convertible debt to shares of common stock		$ 10,000
Number of trading days for conversion of convertible debt into shares of common stock | countries		40
Convertible debt, carrying amount							364
Convertible debt principal							340
Unpaid accrued payment-in-kind interest							30
Unamortized debt issuance costs							$ 1
Convertible Promissory Notes | 2017 Convertible Promissory Notes
Debt Instrument [Line Items]
Number of existing investors | investor							2
Convertible Promissory Notes | 2017 Convertible Promissory Notes | Series D Redeemable Convertible Preferred Stock
Debt Instrument [Line Items]
Shares issued upon conversion of debt (shares) | shares									11,752,210
Convertible Notes Payable [Member] | 2017 Convertible Promissory Notes
Debt Instrument [Line Items]
Debt issued							$ 60
Stated interest rate (percent)											1.29%
Number of new investors | investor											1
Equity financing minimum for conversion of convertible promissory notes											$ 50
Converted principal and interest									$ 60

Commitment and Contingencies (D

Commitment and Contingencies (Details) - USD ($) $ in Millions	Nov. 24, 2020	Jun. 08, 2020	Nov. 30, 2019	Apr. 30, 2021	Oct. 31, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Jul. 31, 2020
Loss Contingencies [Line Items]
Indemnification liability							$ 0	$ 0		$ 0		$ 0	$ 0
General and administrative								188	$ 167	573	$ 337	556	245	$ 78
Dasher California and Massachusetts Actions
Loss Contingencies [Line Items]
Litigation settlement		$ 41	$ 40	$ 100	$ 89		$ 40
Dasher and Caviar Delivery Providers Arbitration
Loss Contingencies [Line Items]
Litigation settlement						$ 70
Escrow deposit								69		69					$ 69
Dasher and Caviar Delivery Providers Arbitration, Additional Agreements
Loss Contingencies [Line Items]
Estimate of litigation settlement								$ 14		14		16
Payments for legal settlements										$ 11
Dasher Pay Model | General and administrative
Loss Contingencies [Line Items]
Litigation settlement paid	$ 3
Loss contingency												3
Dasher Worker Misclassification Cases
Loss Contingencies [Line Items]
General and administrative												$ 83	$ 68	$ 11

Commitment and Contingencies -

Commitment and Contingencies - Noncancelable Purchase Commitments (Details) $ in Millions	Dec. 31, 2020USD ($)
Commitments and Contingencies Disclosure [Abstract]
2021	$ 119
2022	112
2023	104
2024	79
2025	2
Total future minimum payments	$ 416

Commitment and Contingencies _2

Commitment and Contingencies - Credit Agreements (Details) - USD ($) $ in Millions	Nov. 30, 2019	Nov. 30, 2019	Sep. 30, 2021	Dec. 31, 2020	Dec. 31, 2019	Aug. 31, 2020
Line of Credit Facility [Line Items]
Letters of credit outstanding					$ 30
Unsecured Revolving Credit Facility Maturing November 19, 2024 | Higher of Federal Funds Rate or Composite Overnight Bank Borrowing Rate
Line of Credit Facility [Line Items]
Basis spread on variable rate (percent)	0.50%
Unsecured Revolving Credit Facility Maturing November 19, 2024 | Adjusted One-month LIBOR
Line of Credit Facility [Line Items]
Basis spread on variable rate (percent)	1.00%
Unsecured Revolving Credit Facility Maturing November 19, 2024 | Adjusted LIBOR
Line of Credit Facility [Line Items]
Basis spread on variable rate (percent)	1.00%
Revolving Credit Facility | Unsecured Revolving Credit Facility Maturing November 19, 2024
Line of Credit Facility [Line Items]
Revolving credit facility, maximum borrowing capacity	$ 300	$ 300
Unused commitment fee (percent)	0.10%	0.10%
Revolving Credit Facility | Unsecured Revolving Credit Facility Maturing November 19, 2024 | Higher of Federal Funds Rate or Composite Overnight Bank Borrowing Rate
Line of Credit Facility [Line Items]
Basis spread on variable rate (percent)		0.50%
Revolving Credit Facility | Unsecured Revolving Credit Facility Maturing November 19, 2024 | Adjusted One-month LIBOR
Line of Credit Facility [Line Items]
Basis spread on variable rate (percent)		1.00%
Revolving Credit Facility | Unsecured Revolving Credit Facility Maturing November 19, 2024 | Adjusted LIBOR
Line of Credit Facility [Line Items]
Basis spread on variable rate (percent)		1.00%
Revolving Credit Facility | Amended and Restated Revolving Credit and Guaranty Agreement Maturing August 7, 2025
Line of Credit Facility [Line Items]
Revolving credit facility, maximum borrowing capacity						$ 400
Incremental revolving loan commitments						$ 100
Drawn from the revolving credit facility			$ 0	$ 0	$ 0
Letters of credit outstanding			$ 39	$ 44

Commitment and Contingencies _3

Commitment and Contingencies - Sales and Indirect Tax Matters (Details) $ in Millions	9 Months Ended
	Sep. 30, 2021USD ($)
Commitments and Contingencies Disclosure [Abstract]
Reduction in non-income tax reserves	$ 29

Redeemable Convertible Prefer_3

Redeemable Convertible Preferred Stock (Details) - USD ($) $ / shares in Units, $ in Thousands	Dec. 08, 2020	May 14, 2019	Feb. 22, 2019	Jun. 30, 2020	May 31, 2019	Feb. 28, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 09, 2020	Sep. 30, 2020	Sep. 12, 2020	Mar. 31, 2020	Dec. 31, 2017
Redeemable Convertible Preferred Stock [Abstract]
Shares Authorized							0	235,860,000
Shares Issued							0	230,667,000
Shares Outstanding							0	230,667,000
Aggregate Liquidation Preference							$ 0	$ 2,197
Carrying Value								2,264,000
Change in fair value of forward contract liability							$ 0	$ (67,000)	$ 0
Forward Contracts
Redeemable Convertible Preferred Stock [Abstract]
Fair value of forward contract liability		$ 68,000	$ 1,000
Other Expense, Net
Redeemable Convertible Preferred Stock [Abstract]
Change in fair value of forward contract liability					$ 67,000
Class A Common Stock
Class of Stock [Line Items]
Conversion of redeemable convertible preferred stock to common stock in connection with initial publuc offering (shares)	239,269,631
Redeemable Convertible Preferred Stock [Member]
Redeemable Convertible Preferred Stock [Abstract]
Shares Authorized	240,018,000
Shares Issued	238,983,000
Shares Outstanding	238,983,000			238,988,000			0	230,667,000	191,316,000		238,988,000		230,667,000	75,550,000
Aggregate Liquidation Preference	$ 2,579,000
Carrying Value	$ 2,646,000			$ 2,646,000			$ 0	$ 2,264,000	$ 985,000		$ 2,646,000		$ 2,264,000	$ 200,000
Series A-1 redeemable convertible preferred stock
Redeemable Convertible Preferred Stock [Abstract]
Shares Authorized	13,330,000
Shares Issued	13,330,000
Shares Outstanding	13,330,000
Shares issued, price per share (in USD)	$ 0.15
Per Share Conversion Price	$ 0.15
Aggregate Liquidation Preference	$ 2,000
Carrying Value	$ 7,000
Series A redeemable convertible preferred stock
Redeemable Convertible Preferred Stock [Abstract]
Shares Authorized	27,159,000
Shares Issued	27,159,000
Shares Outstanding	27,159,000
Shares issued, price per share (in USD)	$ 0.73
Per Share Conversion Price	$ 0.73
Aggregate Liquidation Preference	$ 20,000
Carrying Value	$ 20,000
Series B redeemable convertible preferred stock
Redeemable Convertible Preferred Stock [Abstract]
Shares Authorized	7,925,000
Shares Issued	7,925,000
Shares Outstanding	7,925,000
Shares issued, price per share (in USD)	$ 5.68
Per Share Conversion Price	$ 5.48
Aggregate Liquidation Preference	$ 45,000
Carrying Value	$ 45,000
Series C redeemable convertible preferred stock
Redeemable Convertible Preferred Stock [Abstract]
Shares Authorized	26,839,000
Shares Issued	26,839,000
Shares Outstanding	26,839,000
Shares issued, price per share (in USD)	$ 4.79
Per Share Conversion Price	$ 4.79
Aggregate Liquidation Preference	$ 128,000
Carrying Value	$ 128,000
Series D redeemable convertible preferred stock
Redeemable Convertible Preferred Stock [Abstract]
Shares Authorized	98,008,000
Shares Issued	98,008,000
Shares Outstanding	98,008,000
Shares issued, price per share (in USD)	$ 5.51									$ 5.50688
Per Share Conversion Price	$ 5.51
Aggregate Liquidation Preference	$ 540,000
Carrying Value	$ 535,000
Shares issued via conversion of convertible promissory notes issued in 2017 (in USD)												$ 4.78778
Series E redeemable convertible preferred stock
Redeemable Convertible Preferred Stock [Abstract]
Shares Authorized	18,055,000
Shares Issued	18,055,000
Shares Outstanding	18,055,000
Shares issued, price per share (in USD)	$ 13.85
Per Share Conversion Price	$ 13.85
Aggregate Liquidation Preference	$ 250,000
Carrying Value	$ 250,000
Series F redeemable convertible preferred stock
Redeemable Convertible Preferred Stock [Abstract]
Shares Authorized	18,186,000
Shares Issued	18,186,000
Shares Outstanding	18,186,000
Shares issued, price per share (in USD)	$ 22.48
Per Share Conversion Price	$ 22.48
Aggregate Liquidation Preference	$ 409,000
Carrying Value	$ 476,000
Number of preferred shares issued in subsequent transaction (in shares)		4,449,370	4,449,370			13,736,615
Sale of stock, price per share (in USD)						$ 22.4751
Gross proceeds from sale of shares				$ 382,000		$ 309,000
Series F redeemable convertible preferred stock | Forward Contracts
Redeemable Convertible Preferred Stock [Abstract]
Fair value of forward contract liability					$ 68,000	$ 1,000
Series F redeemable convertible preferred stock | Investor
Redeemable Convertible Preferred Stock [Abstract]
Number of preferred shares issued in subsequent transaction (in shares)					4,449,370
Gross proceeds from sale of shares					$ 100,000
Series G redeemable convertible preferred stock
Redeemable Convertible Preferred Stock [Abstract]
Shares Authorized	21,165,000
Shares Issued	21,165,000
Shares Outstanding	21,165,000
Shares issued, price per share (in USD)	$ 37.94
Per Share Conversion Price	$ 37.94
Aggregate Liquidation Preference	$ 803,000
Carrying Value	$ 803,000
Series H redeemable convertible preferred stock
Redeemable Convertible Preferred Stock [Abstract]
Shares Authorized	9,351,000
Shares Issued	8,316,000
Shares Outstanding	8,316,000
Shares issued, price per share (in USD)	$ 45.91
Per Share Conversion Price	$ 45.91
Aggregate Liquidation Preference	$ 382,000
Carrying Value	$ 382,000
Number of preferred shares issued in subsequent transaction (in shares)				8,321,395
Sale of stock, price per share (in USD)				$ 45.9062

Redeemable Convertible Prefer_4

Redeemable Convertible Preferred Stock - Forward Contract Liability (Details) $ / shares in Units, $ in Millions	May 14, 2019USD ($)forwardContractPerShare$ / sharesshares	Feb. 22, 2019USD ($)forwardContractPerShare$ / sharesshares	Feb. 28, 2019USD ($)shares	Dec. 31, 2020shares	May 31, 2019USD ($)
Class of Stock [Line Items]
Preferred stock, issued (shares) | shares				0
Preferred stock, outstanding (shares) | shares				0
Series F redeemable convertible preferred stock
Class of Stock [Line Items]
Current forward price per share (in USD per share) | $ / shares	$ 37.76	$ 22.48
Contractual forward price per share (in USD per share) | $ / shares	$ 22.48	$ 22.48
Number of preferred shares issued in subsequent transaction (in shares) | shares	4,449,370	4,449,370	13,736,615
Forward Contracts
Class of Stock [Line Items]
Fair value of forward contract liability | $	$ 68	$ 1
Forward Contracts | Series F redeemable convertible preferred stock
Class of Stock [Line Items]
Fair value of forward contract liability | $			$ 1		$ 68
Forward Contracts | Series F redeemable convertible preferred stock | Contract Value
Class of Stock [Line Items]
Derivative liability, measurement input | forwardContractPerShare	15.28	0.13
Forward Contracts | Series F redeemable convertible preferred stock | Risk-Free Interest Rate
Class of Stock [Line Items]
Derivative liability, measurement input | forwardContractPerShare	2.41	2.46
Forward Contracts | Series F redeemable convertible preferred stock | Expected Term
Class of Stock [Line Items]
Expected years until subsequent closing		2 months 23 days
Forward Contracts | Series F redeemable convertible preferred stock | Present Value
Class of Stock [Line Items]
Derivative liability, measurement input | forwardContractPerShare	22.48	22.35

Common Stock - Reserved for Fut

Common Stock - Reserved for Future Issuance (Details) - shares shares in Thousands	Dec. 31, 2020	Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock reserved for future issuance on an as-converted basis (in shares)	107,450	293,602
Conversion of outstanding redeemable convertible preferred stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock reserved for future issuance on an as-converted basis (in shares)	0	230,953
Stock options issued and outstanding under the 2014 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock reserved for future issuance on an as-converted basis (in shares)	33,802	36,247
RSUs outstanding under the 2014 and 2020 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock reserved for future issuance on an as-converted basis (in shares)	34,939	15,924
Remaining shares available for future issuance
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock reserved for future issuance on an as-converted basis (in shares)	32,210	10,478
Shares available for issuance under the 2020 Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock reserved for future issuance on an as-converted basis (in shares)	6,499	0

Common Stock - Additional Infor

Common Stock - Additional Information (Details) $ in Millions

Nov. 09, 2021USD ($)

Jan. 01, 2021shares

Dec. 08, 2020countries

Dec. 08, 2020Day

Sep. 12, 2020USD ($)

Nov. 30, 2021

Mar. 31, 2014

Sep. 30, 2021USD ($)

Sep. 30, 2020USD ($)

Sep. 30, 2021USD ($)

Sep. 30, 2020USD ($)

Dec. 31, 2020USD ($)

Dec. 31, 2019USD ($)

Dec. 31, 2018USD ($)

Sep. 30, 2014

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Total stock-based compensation expense | $

$ 122

$ 3

$ 357

$ 11

$ 322

$ 18

$ 24

Stock Options

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Award vesting period

4 years

Restricted Stock Units (RSUs) [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Award vesting period

4 years

4 years

Total stock-based compensation expense | $

$ 279

$ 279

2014 Stock Option Plan | Stock Options

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Option grant price as percent of fair value of stock price (not less than)

100.00%

100.00%

Award vesting period

4 years

4 years

Option term

10 years

2014 Stock Option Plan | Incentive Stock Option Grant to a Greater than 10% Stockholder

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Option grant price as percent of fair value of stock price (not less than)

110.00%

110.00%

Option term

5 years

2020 Equity Incentive Plan

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Number of business days prior to effective date of registration statement that the 2020 Plan became effective

1

1

2020 Equity Incentive Plan | Class A Common Stock

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Additional shares authorized (in shares) | shares

32,493,000

Percent of outstanding shares

5.00%

2020 Equity Incentive Plan | Class A Common Stock | Subsequent Event [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Additional shares authorized (in shares) | shares

32,493,000

Percent of outstanding shares

5.00%

2020 Equity Incentive Plan | Stock Options

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Option grant price as percent of fair value of stock price (not less than)

100.00%

100.00%

100.00%

Award vesting period

4 years

4 years

Option term

10 years

10 years

2020 Equity Incentive Plan | Incentive Stock Option Grant to a Greater than 10% Stockholder

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Option grant price as percent of fair value of stock price (not less than)

110.00%

110.00%

110.00%

Option term

5 years

5 years

Common Stock - Shares Available

Common Stock - Shares Available for Grant (Details) - USD ($) shares in Thousands, $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2021	Dec. 31, 2020	Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares withheld related to net share settlement (shares)			65
RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Forfeited (in shares)	909	1,046
Stock units granted (in shares)	6,545	20,126
2014 and 2020 Plans
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares Available for Grant, beginning balance (in shares)		32,210	10,478
Options forfeited (in shares)			$ 254
Shares authorized (in shares)			40,493
Shares Available for Grant, ending balance (in shares)			32,210
2014 and 2020 Plans | RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Forfeited (in shares)			1,046
Stock units granted (in shares)			20,126

Common Stock - Options Outstand

Common Stock - Options Outstanding (Details) - USD ($) $ / shares in Units, $ in Millions	9 Months Ended		12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Shares subject to options outstanding, beginning balance (in shares)	33,802,000	33,802,000	33,802,000	36,247,000
Options granted (in shares)	0	0	0
Options exercised (in shares)	(12,346,000)		(2,191,000)
Options forfeited (in shares)	(28,000)		(254,000)
Shares subject to options outstanding, ending balance (in shares)	21,428,000		33,802,000	33,802,000	36,247,000
Exercisable (in shares)	19,231,000		28,291,000
Vested and expected to vest (in shares)	21,428,000		33,802,000
Weighted Average Exercise Price [Abstract]
Shares subject to options outstanding, weighted-average exercise price (in dollars per share)	$ 2.51		$ 2.42	$ 2.38
Options granted (in dollars per share)	0		0
Options exercised (in dollars per share)	2.27		1.90
Options forfeited (in dollars per share)	2.98		1.94
Exercisable (in dollars per share)	2.07		1.95
Vested and expected to vest (in dollars per share)	$ 2.51		$ 2.42
Options outstanding, weighted-average remaining contractual term (in years)	4 years 10 months 13 days		5 years 11 months 1 day	6 years 11 months 1 day
Exercisable, weighted-average remaining contractual term (in years)	4 years 7 months 20 days		5 years 7 months 9 days
Vested and expected to vest, weighted-average remaining contractual term (in years)	4 years 10 months 13 days		5 years 11 months 1 day
Options outstanding, aggregate intrinsic value	$ 4,359		$ 4,744	$ 1,070
Options exercised, aggregate intrinsic value	1,880	$ 57	129	$ 47	$ 24
Exercisable, aggregate intrinsic value	3,921		3,983
Vested and expected to vest, aggregate intrinsic value	$ 4,359		$ 4,744
Options granted, weighted-average grant date fair value (in dollars per share)			$ 0	$ 11.78	$ 2.74

Common Stock - Restricted Stock

Common Stock - Restricted Stock unit Activity (Details) - Unvested restricted stock units - USD ($) $ / shares in Units, $ in Millions	9 Months Ended		12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]
Unvested units, beginning balance (in shares)	28,366,000	28,366,000	28,366,000	15,924,000
Grants (in shares)	6,545,000		20,126,000
Vested (in shares)	(47,000)		(6,573,000)	0	0
Vested and settled (in shares)	(5,852,000)		(65,000)
Restricted stock units forfeited (in shares)	(909,000)		(1,046,000)
Unvested units, ending balance (in shares)	28,103,000		28,366,000	28,366,000	15,924,000
Weighted Average Grant Date Fair Value [Abstract]
Grants (in dollars per share)	$ 166.87	$ 34.11	$ 56.27	$ 27.31	$ 7.86
Vested (in dollars per share)	105.26		17.40
Vested and settled (in dollars per share)	50.34		10.68
Forfeited (in dollars per share)	$ 72.89		$ 29.14
Aggregate instrinsic value	$ 5,789		$ 4,049	$ 508

Common Stock - Assumptions Used

Common Stock - Assumptions Used to Estimate Fair Value of Stock Options (Details)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected volatility, minimum		53.73%	54.10%
Expected volatility, maximum		53.85%	57.64%
Risk-free rate, minimum		2.35%	2.49%
Risk-free rate, maximum		2.36%	3.08%
Dividend yield	0.00%	0.00%	0.00%
Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected term (in years)		5 years 10 months 28 days	5 years
Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected term (in years)		6 years 10 days	6 years 1 month 6 days

Common Stock - Stock-based Comp

Common Stock - Stock-based Compensation Expense (Details) - USD ($) $ in Millions	Nov. 09, 2021	Sep. 12, 2020	Nov. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Total stock-based compensation expense				$ 122	$ 3	$ 357	$ 11	$ 322	$ 18	$ 24
Stock options to purchase common stock
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Unrecognized stock-based compensation expense related to unvested stock options				9		9		$ 20
Unrecognized stock-based compensation expense related to unvested stock options, remaining period for recognition							9 months 18 days	1 year 3 months 21 days
CEO Performance Award | Chief Executive Officer | 2014 Equity Incentive Plan
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Total stock-based compensation expense								$ 12
Unrecognized stock-based compensation expense related to unvested stock options				318		$ 318		401
Unrecognized stock-based compensation expense related to unvested stock options, remaining period for recognition						3 years 6 months 25 days
Grants (in shares)			10,379,000
Unvested restricted stock units
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Total stock-based compensation expense	$ 279	$ 279
Unrecognized stock-based compensation expense related to unvested stock options	$ 1,400							$ 710
Unrecognized stock-based compensation expense related to unvested stock options, remaining period for recognition						2 years 8 months 4 days		2 years 10 months 28 days
Grants (in shares)						6,545,000		20,126,000
Cost of revenue, exclusive of depreciation and amortization
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Total stock-based compensation expense				13	0	$ 34	$ 1	$ 31	2	3
Sales and marketing
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Total stock-based compensation expense				14	0	38	1	37	2	3
Research and development
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Total stock-based compensation expense				47	2	129	5	171	8	11
General and administrative
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Total stock-based compensation expense				$ 48	$ 1	$ 156	$ 4	$ 83	$ 6	$ 7

Common Stock - Employee Stock P

Common Stock - Employee Stock Purchase Plan (Details)	Jan. 01, 2021shares	Sep. 30, 2021purchasePeriod	Dec. 31, 2020purchasePeriodshares	Dec. 31, 2019shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock reserved for sales under the ESPP (in shares)			107,450,000	293,602,000
Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of open purchase periods under the ESPP | purchasePeriod		0	0
2020 Employee Stock Purchase Plan | Class A Common Stock | Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock reserved for sales under the ESPP (in shares)			6,498,600
Additional shares authorized (in shares)	6,498,600
Percent of outstanding shares	1.50%
2020 Employee Stock Purchase Plan | Class A Common Stock | Employee Stock Purchase Plan | Subsequent Event
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Additional shares authorized (in shares)	6,498,600
Percent of outstanding shares	1.50%

Common Stock - CEO Performance

Common Stock - CEO Performance Awards (Details) $ / shares in Units, $ in Millions	Nov. 09, 2021USD ($)	Sep. 12, 2020USD ($)	Nov. 30, 2021	Nov. 30, 2020USD ($)trancheemployee$ / sharesshares	Sep. 30, 2021USD ($)shares	Sep. 30, 2020USD ($)	Sep. 30, 2021USD ($)$ / sharesshares	Sep. 30, 2020USD ($)$ / shares	Dec. 31, 2020USD ($)$ / sharesshares	Dec. 31, 2019USD ($)$ / sharesshares	Dec. 31, 2018USD ($)$ / sharesshares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense | $					$ 122	$ 3	$ 357	$ 11	$ 322	$ 18	$ 24
CEO Performance Award | 2014 Equity Incentive Plan | Chief Executive Officer
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grants (in shares) | shares				10,379,000
Award vesting period				18 months
Award contractual term				7 years
Number of vesting tranches | tranche				9
Number of consecutive trading days included in stock target price measurement period | employee				180
Grants (in dollars per share)				$ 39.8275
Stock compensation expense to be recognized over the derived service period of each tranche | $					$ 318		$ 318		401
Stock-based compensation expense | $									$ 12
CEO Performance Award | 2014 Equity Incentive Plan | Chief Executive Officer | Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Company stock price target (in dollars per share)				$ 187.60
Derived service period of award				2 years 6 months 10 days
CEO Performance Award | 2014 Equity Incentive Plan | Chief Executive Officer | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Company stock price target (in dollars per share)				$ 501
Derived service period of award				4 years 5 months 1 day
CEO Performance Award | 2014 Equity Incentive Plan | Chief Executive Officer | Tranche 1
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Company stock price target (in dollars per share)				$ 187.60
Number of RSUs eligible to vest (in shares) | shares				518,950
CEO Performance Award | 2014 Equity Incentive Plan | Chief Executive Officer | Tranche 2
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Company stock price target (in dollars per share)				$ 226.80
Number of RSUs eligible to vest (in shares) | shares				518,950
CEO Performance Award | 2014 Equity Incentive Plan | Chief Executive Officer | Tranche 3
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Company stock price target (in dollars per share)				$ 265.80
Number of RSUs eligible to vest (in shares) | shares				1,037,900
CEO Performance Award | 2014 Equity Incentive Plan | Chief Executive Officer | Tranche 4
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Company stock price target (in dollars per share)				$ 305
Number of RSUs eligible to vest (in shares) | shares				1,037,900
CEO Performance Award | 2014 Equity Incentive Plan | Chief Executive Officer | Tranche 5
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Company stock price target (in dollars per share)				$ 344
Number of RSUs eligible to vest (in shares) | shares				1,037,900
CEO Performance Award | 2014 Equity Incentive Plan | Chief Executive Officer | Tranche 6
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Company stock price target (in dollars per share)				$ 383
Number of RSUs eligible to vest (in shares) | shares				1,556,850
CEO Performance Award | 2014 Equity Incentive Plan | Chief Executive Officer | Tranche 7
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Company stock price target (in dollars per share)				$ 422.20
Number of RSUs eligible to vest (in shares) | shares				1,556,850
CEO Performance Award | 2014 Equity Incentive Plan | Chief Executive Officer | Tranche 8
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Company stock price target (in dollars per share)				$ 461.20
Number of RSUs eligible to vest (in shares) | shares				1,556,850
CEO Performance Award | 2014 Equity Incentive Plan | Chief Executive Officer | Tranche 9
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Company stock price target (in dollars per share)				$ 501
Number of RSUs eligible to vest (in shares) | shares				1,556,850
RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grants (in shares) | shares							6,545,000		20,126,000
Award vesting period			4 years						4 years
Grants (in dollars per share)							$ 166.87	$ 34.11	$ 56.27	$ 27.31	$ 7.86
Stock compensation expense to be recognized over the derived service period of each tranche | $	$ 1,400								$ 710
Stock-based compensation expense | $	$ 279	$ 279
Number of RSUs eligible to vest (in shares) | shares					28,103,000		28,103,000		28,366,000	28,366,000	15,924,000
RSUs | Chief Executive Officer
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Aggregate grant date fair value | $				$ 413

Tender Offer and Stock Repurc_2

Tender Offer and Stock Repurchases (Details) $ / shares in Units, $ in Millions	1 Months Ended		12 Months Ended
	Oct. 31, 2018USD ($)shares	Sep. 30, 2018USD ($)$ / shares	Dec. 31, 2018USD ($)Employeeshares
Equity, Class of Treasury Stock [Line Items]
Repurchase and retirement of stock			$ (60)
September 2018 Repurchase Program
Equity, Class of Treasury Stock [Line Items]
Stock repurchase program, authorized amount		$ 100
Repurchase and retirement of stock	$ 62
Separation Arrangement
Equity, Class of Treasury Stock [Line Items]
Repurchase and retirement of stock (shares) | shares			193,775
Number of employees included in stock repurchase arrangement | Employee			2
Common Stock [Member]
Equity, Class of Treasury Stock [Line Items]
Repurchase and retirement of stock (shares) | shares			(7,208,000)
Common Stock [Member] | September 2018 Repurchase Program
Equity, Class of Treasury Stock [Line Items]
Stock repurchase program, price per share | $ / shares		$ 8.40
Repurchase and retirement of stock (shares) | shares	7,014,335
Purchase price of shares in excess of fair value	$ 9
Redeemable Convertible Preferred Stock
Equity, Class of Treasury Stock [Line Items]
Repurchase and retirement of stock			$ (3)
Redeemable Convertible Preferred Stock | September 2018 Repurchase Program
Equity, Class of Treasury Stock [Line Items]
Stock repurchase program, price per share | $ / shares		$ 9.60
Series A Redeemable Convertible Preferred Stock | September 2018 Repurchase Program
Equity, Class of Treasury Stock [Line Items]
Repurchase and retirement of stock (shares) | shares	189,685
Purchase price of shares in excess of carrying value	$ 3
Series A-1 Redeemable Convertible Preferred Stock | September 2018 Repurchase Program
Equity, Class of Treasury Stock [Line Items]
Repurchase and retirement of stock (shares) | shares	107,600

Income Taxes - Components of Co

Income Taxes - Components of Consolidated Income (Loss) before Taxes (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
United States	$ (463)	$ (666)	$ (204)
Foreign	5	0	0
Loss before income taxes	$ (458)	$ (666)	$ (204)

Income Taxes - Reconciliation o

Income Taxes - Reconciliation of Federal Income Tax Rate (Details)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Federal tax (benefit) at statutory rate	21.00%	21.00%	21.00%
State tax (benefit) at statutory rate, net of federal benefit	3.00%	4.00%	4.00%
Change in valuation allowance	(21.00%)	(23.00%)	(25.00%)
Stock-based compensation	(2.00%)	0.00%	(1.00%)
Research and development credits	3.00%	1.00%	1.00%
Change in fair value of forward contract liability	0.00%	(3.00%)	0.00%
Non-deductible expenses	(3.00%)	0.00%	0.00%
Non-deductible interest expense	(2.00%)	0.00%	0.00%
Provision for income taxes	(1.00%)	0.00%	0.00%

Income Taxes - Deferred Tax Ass

Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Deferred tax assets
Accruals and reserves	$ 95	$ 44
Stock-based compensation	72	5
Tax credits carryforward	23	12
Operating leases	64	46
Net operating losses carryforward	180	200
Total gross deferred tax assets	434	307
Less: Valuation allowance	(357)	(260)
Total deferred tax assets net of valuation allowance	(77)	(47)
Deferred tax liabilities
Property and equipment and intangible assets	(19)	0
ROU assets	(51)	(42)
Deferred contract costs	(10)	(5)
Total gross deferred tax liabilities	(80)	(47)
Net deferred tax liabilities	$ (3)	$ 0

Income Taxes - Additional Infor

Income Taxes - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Provision for income taxes	$ 0	$ 1	$ 3	$ 2	$ 3	$ 1	$ 0
Unrecognized tax benefits that, if recognized, would result in adjustments to the valuation allowance	$ 61		$ 61		7	7
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount					97	154
Deferred Tax Assets, Operating Loss Carryforwards, Domestic					689
Deferred Tax Assets, Operating Loss Carryforwards, State and Local					547
Deferred Tax Assets, Operating Loss Carryforwards, Not Subject to Expiration					629
Unrecognized tax benefits, income tax penalties and interest accrued					0	$ 0	$ 0
Deferred Tax Liabilities, Undistributed Foreign Earnings					$ 0
Domestic Tax Authority [Member]
Net operating loss carryforward, limitation, as percent of net income					80.00%
Domestic Tax Authority [Member] | Research Tax Credit Carryforward [Member]
Tax credit carryforwards					$ 19
California Franchise Tax Board [Member] | Research Tax Credit Carryforward [Member]
Tax credit carryforwards					$ 12

Income Taxes - Unrecognized Tax

Income Taxes - Unrecognized Tax Benefits (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Unrecognized tax benefits at beginning of year	$ 7	$ 3	$ 1
Increases related to current year tax positions	3	4	2
Decreases related to prior year tax positions	(3)	0	0
Unrecognized tax benefits at end of year	$ 7	$ 7	$ 3

Net Loss per Share Attributab_3

Net Loss per Share Attributable to Common Stockholders (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended						9 Months Ended		12 Months Ended
	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Class of Stock [Line Items]
Net loss	$ (101)	$ (102)	$ (110)	$ (43)	$ 23	$ (129)	$ (313)	$ (149)	$ (461)	$ (667)	$ (204)
Weighted-average number of shares outstanding used to compute net loss per share attributable to common stockholders, basic (in shares)	340,169			45,016			334,277	44,568
Net loss per share attributable to common stockholders, basic (in $ per share)	$ 300			$ 960			$ 940	$ 3,340
Less: Premium paid on repurchase of redeemable convertible preferred stock											3
Less: Deemed dividend to preferred stockholders										1
Net loss attributable to common stockholders									$ (461)	$ (668)	$ (207)
Weighted-average number of shares outstanding used to compute net loss per share attributable to common stockholders, basic and diluted (in shares)									62,390	43,252	44,305
Net loss per share attributable to common stockholders, basic and diluted ($ per share)									$ (7.39)	$ (15.44)	$ (4.67)
Common Stock
Class of Stock [Line Items]
Net loss				$ (43)				$ (149)		$ (667)	$ (204)
Weighted-average number of shares outstanding used to compute net loss per share attributable to common stockholders, basic (in shares)				45,016				44,568
Weighted-average number of shares outstanding used to compute net loss per share attributable to common stockholders, diluted (in shares)				45,016				44,568
Net loss per share attributable to common stockholders, basic (in $ per share)				$ (0.96)				$ (3.34)
Net loss attributable to common stockholders, diluted (in $ per share)				$ (0.96)				$ (3.34)
Less: Premium paid on repurchase of redeemable convertible preferred stock										0	(3)
Less: Deemed dividend to preferred stockholders										(1)	0
Net loss attributable to common stockholders										$ (668)	$ (207)
Weighted-average number of shares outstanding used to compute net loss per share attributable to common stockholders, basic and diluted (in shares)										43,252	44,305
Net loss per share attributable to common stockholders, basic and diluted ($ per share)										$ (15.44)	$ (4.67)
Common Stock | Class A Common Stock
Class of Stock [Line Items]
Net loss	$ (92)						$ (284)		$ (446)
Weighted-average number of shares outstanding used to compute net loss per share attributable to common stockholders, basic (in shares)	308,797						302,954
Weighted-average number of shares outstanding used to compute net loss per share attributable to common stockholders, diluted (in shares)	308,797						302,954
Net loss per share attributable to common stockholders, basic (in $ per share)	$ (0.30)						$ (0.94)
Net loss attributable to common stockholders, diluted (in $ per share)	$ (0.30)						$ (0.94)
Less: Premium paid on repurchase of redeemable convertible preferred stock									0
Less: Deemed dividend to preferred stockholders									0
Net loss attributable to common stockholders									$ (446)
Weighted-average number of shares outstanding used to compute net loss per share attributable to common stockholders, basic and diluted (in shares)									60,422
Net loss per share attributable to common stockholders, basic and diluted ($ per share)									$ (7.39)
Common Stock | Class B Common Stock
Class of Stock [Line Items]
Net loss	$ (9)						$ (29)		$ (15)
Weighted-average number of shares outstanding used to compute net loss per share attributable to common stockholders, basic (in shares)	31,372						31,323
Weighted-average number of shares outstanding used to compute net loss per share attributable to common stockholders, diluted (in shares)	31,372						31,323
Net loss per share attributable to common stockholders, basic (in $ per share)	$ (0.30)						$ (0.94)
Net loss attributable to common stockholders, diluted (in $ per share)	$ (0.30)						$ (0.94)
Less: Premium paid on repurchase of redeemable convertible preferred stock									0
Less: Deemed dividend to preferred stockholders									0
Net loss attributable to common stockholders									$ (15)
Weighted-average number of shares outstanding used to compute net loss per share attributable to common stockholders, basic and diluted (in shares)									1,968
Net loss per share attributable to common stockholders, basic and diluted ($ per share)									$ (7.39)

Net Loss per Share Attributab_4

Net Loss per Share Attributable to Common Stockholders - Antidilutive Securities (Details) - shares shares in Thousands	9 Months Ended		12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potential dilutive securities (shares)	49,531	299,628	54,384	283,124	236,883
Redeemable convertible preferred stock (on an as-converted basis)
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potential dilutive securities (shares)	0	239,275	0	230,953	191,602
Stock options to purchase common stock
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potential dilutive securities (shares)	21,428	34,554	33,802	36,247	39,191
Unvested restricted stock units
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potential dilutive securities (shares)	28,103	20,021	17,987	15,924	6,065
Common stock subject to repurchase
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potential dilutive securities (shares)			0	0	25
Convertible promissory notes
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potential dilutive securities (shares)	0	5,778	2,595	0	0

Subsequent Events (Details)

Subsequent Events (Details) $ in Millions, € in Billions	Nov. 09, 2021EUR (€)countries	Oct. 19, 2021USD ($)	Feb. 28, 2021USD ($)
2020 Convertible Promissory Notes [Member] | Convertible Debt [Member]
Subsequent Event [Line Items]
Outstanding principal and accrued interest repaid			$ 375
Subsequent Event
Subsequent Event [Line Items]
Investment in preferred shares of a private company		$ 400
Subsequent Event | Wolt Enterprises OY
Subsequent Event [Line Items]
Number of countries in which entity operates | countries	23
Definitive agreement, purchase price | €	€ 7

Summary of Significant Accoun_5

Summary of Significant Accounting Policies - Property and Equipment, Net (Details)	12 Months Ended
	Dec. 31, 2020
Equipment for Merchants [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	2 years
Computer Equipment and Software [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	2 years
Office Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	5 years
Software and Software Development Costs [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	2 years