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Market capitalization achieved.

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Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

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Equity Incentive Plans - Additional Information (Detail)	1 Months Ended			3 Months Ended			12 Months Ended
	Mar. 31, 2018 USD ($) Tranches milestone shares	Dec. 31, 2014 Tranches shares	Aug. 31, 2012 Tranches shares	Dec. 31, 2020 USD ($) shares	Sep. 30, 2020 USD ($)	Jun. 30, 2020 USD ($)	Dec. 31, 2020 USD ($) Vehicle $ / shares shares	Dec. 31, 2019 USD ($) $ / shares shares	Dec. 31, 2018 USD ($) $ / shares shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Contractual term of stock options, in years							10 years
Aggregate intrinsic value of options exercised							$ 1,550,000,000	$ 237,000,000	$ 293,000,000
Percentage of payroll deductions of employees eligible compensation							15.00%
Percentage of discount on purchase price of shares lower than fair market value							85.00%
Number of shares issued under ESPP \| shares							1,800,000	2,500,000	2,000,000.0
Unrecognized compensation expense				$ 3,510,000,000			$ 3,510,000,000
Weighted-average period of recognition of unrecognized compensation, in years							2 years 8 months 12 days
Stock-based compensation							$ 1,734,000,000	$ 898,000,000	$ 749,000,000
Aggregate number of vehicle production \| Vehicle							300,000
Stock-based compensation expense capitalized							$ 89,000,000	$ 52,000,000	$ 18,000,000
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
Employee Stock [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Value of shares available for issuance under ESPP				$ 34,300,000			$ 34,300,000
2019 Equity Incentive Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares were reserved for issuance \| shares				49,000,000.0			49,000,000.0
Number of stock options grant \| shares							4,780,000
RSUs [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Weighted average grant date fair value \| $ / shares							$ 300.51	$ 56.55	$ 63.29
Aggregate fair value							$ 3,250,000,000	$ 502,000,000	$ 546,000,000
RSUs [Member] \| 2019 Equity Incentive Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Weighted average grant date fair value \| $ / shares							$ 300.51
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	101,300,000
Number of vesting tranches CEO Performance Award consists \| Tranches	12
Increase to market capitalization for each remaining milestone	$ 50,000,000,000.0
Number of operational milestones focused on total 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 $100.0 billion for the first tranche and increases by increments of $50.0 billion thereafter (based on both a six calendar month trailing average and a 30 calendar day trailing average, counting only trading days), has been achieved, and (ii) any one of the following eight operational milestones focused on total revenue or any one of the eight operational milestones focused on Adjusted EBITDA have been achieved for the previous four consecutive fiscal quarters on an annualized basis.
Holding period of shares post-exercise	5 years
Payment of exercise price per share \| $ / shares							$ 70.01
Operational milestones based on total revenue						$ 20,000,000,000.0
Stock-based compensation							$ 838,000,000	296,000,000	175,000,000
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]
Annualized Adjusted EBITDA of operational milestone				$ 8,000,000,000.0	$ 6,000,000,000.0	4,500,000,000
Recognized catch-up expense during period				75,000,000	77,000,000	79,000,000
Unrecognized compensation expense				264,000,000			$ 264,000,000
Weighted-average period of recognition of unrecognized compensation, in 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				712,000,000			$ 712,000,000
2018 CEO Performance Award [Member] \| First Tranche Milestone [Member] \| Chief Executive Officer [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Market capitalization	$ 100,000,000,000.0
Market capitalization achieved						100,000,000,000.0
Unamortized expense						$ 22,000,000
2018 CEO Performance Award [Member] \| Second Tranche Milestone [Member] \| Chief Executive Officer [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Market capitalization achieved					150,000,000,000.0
Unamortized expense					95,000,000
Annualized Adjusted EBITDA of operational milestone					1,500,000,000
2018 CEO Performance Award [Member] \| Third Tranche Milestone [Member] \| Chief Executive Officer [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Market capitalization achieved					200,000,000,000.0
Unamortized expense					118,000,000
Annualized Adjusted EBITDA of operational milestone					$ 3,000,000,000.0
2018 CEO Performance Award [Member] \| Fourth Tranche Milestone [Member] \| Chief Executive Officer [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Market capitalization achieved				250,000,000,000.0
Unamortized expense				122,000,000			122,000,000
Annualized Adjusted EBITDA of operational milestone				4,500,000,000
2014 Performance-based Stock Option Grants [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of stock options grant \| shares		5,400,000
Stock-based compensation							0	0	$ 0
Number of vesting tranches \| Tranches		4
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			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			26,400,000
Number of vesting tranches CEO Performance Award consists \| Tranches			10
Market capitalization				4,000,000,000.00			4,000,000,000.00
Stock-based compensation							0	$ 0
Initial market capitalization				3,200,000,000			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			$ 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