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Initial market capitalization.

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Market capitalization.

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Number of tranches.

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Number of vehicle production.

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Operational milestone based on revenue.

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Portion of stock options scheduled to vest upon successful completion of performance objectives.

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Share-based compensation arrangement holding period of shares post-exercise.

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Aggregate number of common shares reserved for future issuance.

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Maximum term of the deferred compensation arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Amount of tax benefit from exercise of option under share-based payment arrangement.

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Equity Incentive Plans - Additional Information (Detail)	1 Months Ended			3 Months Ended
	Mar. 31, 2018 USD ($) Tranches milestone shares	Dec. 31, 2014 Tranches shares	Aug. 31, 2012 Tranches shares	Mar. 31, 2020 USD ($) Tranches milestone Vehicle shares	Mar. 31, 2019 USD ($)	Sep. 30, 2020 USD ($)
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Contractual term of stock options, in years				10 years
Unrecognized compensation expense				$ 1,590,000,000
Weighted-average period of recognition of unrecognized compensation, in years				2 years 9 months 18 days
Stock-based compensation				$ 211,000,000	$ 208,000,000
Aggregate number of vehicle production \| Vehicle				300,000
Income tax benefit from stock option exercises				$ 0
Upon Completion of First Model X Production Vehicle [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Portion of stock options scheduled to vest upon successful completion of performance objectives				25.00%
Upon Achieving Aggregate Production of 100,000 Vehicles in Trailing 12-month Period [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Portion of stock options scheduled to vest upon successful completion of performance objectives				25.00%
Aggregate number of vehicle production \| Vehicle				100,000
Upon Completion of First Gen III Production Vehicle [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Portion of stock options scheduled to vest upon successful completion of performance objectives				25.00%
Annualized Gross Margin of Greater Than 30% for Any Three Year Period [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Portion of stock options scheduled to vest upon successful completion of performance objectives				25.00%
Gross margin				30.00%
Fourth Tranche [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Aggregate number of vehicle production \| Vehicle				100,000
Third Tranche [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Aggregate number of vehicle production \| Vehicle				200,000
2019 Equity Incentive Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares were reserved for issuance \| shares				11,000,000
2018 CEO Performance Award [Member] \| Chief Executive Officer [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of stock options grant \| shares	20,264,042
Number of vesting tranches CEO Performance Award consists \| Tranches	12
Increase to market capitalization for each remaining milestone	$ 50,000,000,000
Number of operational milestones focused on revenue \| milestone	8
Number of operational milestones focused on adjusted EBITDA \| milestone	8
Award vesting description				Each of the 12 vesting tranches of the 2018 CEO Performance Award will vest upon certification by the Board of Directors that both (i) the market capitalization milestone for such tranche, which begins at $100 billion for the first tranche and increases by increments of $50 billion thereafter (based on both a six calendar month trailing average and a 30 calendar day trailing average, counting only trading days), has been met, and (ii) any one of the following eight operational milestones focused on revenue or eight operational milestones focused on Adjusted EBITDA have been met for the previous four consecutive fiscal quarters on an annualized basis.
Holding period of shares post-exercise	5 years
Number of operational milestones achieved \| milestone				2
Operational milestones based on total revenue				$ 20,000,000,000.0
Operational milestone based on adjusted EBITDA one				1,500,000,000
Operational milestone based on adjusted EBITDA two				$ 3,000,000,000.0
Number of vesting tranches \| Tranches				0
Stock-based compensation				$ 66,000,000	55,000,000
2018 CEO Performance Award [Member] \| Chief Executive Officer [Member] \| Scenario Forecast [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Unamortized expense						$ 22,000,000
2018 CEO Performance Award [Member] \| Chief Executive Officer [Member] \| Operational Milestones Probable of Being Achieved [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Operational milestones based on total revenue				35,000,000,000.0
Operational milestone based on adjusted EBITDA two				3,000,000,000.0
Unrecognized compensation expense				$ 461,000,000
Weighted-average period of recognition of unrecognized compensation, in years				2 years 7 months 6 days
2018 CEO Performance Award [Member] \| Chief Executive Officer [Member] \| Operational Milestones Not Considered Probable Achievement [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Unrecognized compensation expense				$ 1,290,000,000
2018 CEO Performance Award [Member] \| Chief Executive Officer [Member] \| First Tranche Milestone [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Market capitalization	$ 100,000,000,000			100,000,000,000
2014 Performance-based Stock Option Grants [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of stock options grant \| shares		1,073,000
Number of vesting tranches \| Tranches		4
Stock-based compensation				0	0
2014 Performance-based Stock Option Grants [Member] \| Performance Condition Not Considered Probable Achievement [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Unrecognized compensation expense				4,000,000
2012 CEO Performance Award [Member] \| Chief Executive Officer [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of stock options grant \| shares			5,274,901
Number of vesting tranches CEO Performance Award consists \| Tranches			10
Market capitalization				4,000,000,000.00
Stock-based compensation				0	$ 0
Initial market capitalization				3,200,000,000
2012 CEO Performance Award [Member] \| Chief Executive Officer [Member] \| Performance Condition Not Considered Probable Achievement [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Unrecognized compensation expense				$ 6,000,000
Maximum [Member] \| Stock Options [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting period, in years				4 years
Maximum [Member] \| RSUs [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting period, in years				4 years