Goodwill and Intangible Assets - Summary of Acquired Intangible Assets (Detail) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Acquired Intangible Assets [Line Items]
Finite-lived intangible assets, Gross Carrying Amount	$ 456	$ 445
Finite-lived intangible assets, Accumulated Amortization	(162)	(113)
Finite-lived intangible assets, Other	4	2
Finite-lived intangible assets, Net Carrying Amount	298	334
Indefinite-lived intangible assets, Gross Carrying Amount	15	65
Indefinite-lived intangible assets, Other		(60)
Indefinite-lived intangible assets, Net Carrying Amount	15	5
Intangible Assets, Gross Carrying Amount	471	510
Intangible assets, Other	4	(58)
Intangible Assets, Net Carrying Amount	313	339
Gigafactory Nevada Water Rights [Member]
Acquired Intangible Assets [Line Items]
Indefinite-lived intangible assets, Gross Carrying Amount	15	5
Indefinite-lived intangible assets, Net Carrying Amount	15	5
In-Process Research and Development (?IPR&D?) [Member]
Acquired Intangible Assets [Line Items]
Indefinite-lived intangible assets, Gross Carrying Amount		60
Indefinite-lived intangible assets, Other		(60)
Developed Technology [Member]
Acquired Intangible Assets [Line Items]
Finite-lived intangible assets, Gross Carrying Amount	302	291
Finite-lived intangible assets, Accumulated Amortization	(111)	(72)
Finite-lived intangible assets, Other	3	1
Finite-lived intangible assets, Net Carrying Amount	194	220
Trade names [Member]
Acquired Intangible Assets [Line Items]
Finite-lived intangible assets, Gross Carrying Amount	3	3
Finite-lived intangible assets, Accumulated Amortization	(1)	(1)
Finite-lived intangible assets, Other		1
Finite-lived intangible assets, Net Carrying Amount	2	3
Favorable Contracts and Leases, Net [Member]
Acquired Intangible Assets [Line Items]
Finite-lived intangible assets, Gross Carrying Amount	113	113
Finite-lived intangible assets, Accumulated Amortization	(32)	(24)
Finite-lived intangible assets, Net Carrying Amount	81	89
Other [Member]
Acquired Intangible Assets [Line Items]
Finite-lived intangible assets, Gross Carrying Amount	38	38
Finite-lived intangible assets, Accumulated Amortization	(18)	(16)
Finite-lived intangible assets, Other	1
Finite-lived intangible assets, Net Carrying Amount	$ 21	$ 22