Property, Plant and Equipment, Net - Schedule of Property, Plant and Equipment, Net (Detail) - USD ($) $ in Millions	Jun. 30, 2021	Jan. 01, 2021	Dec. 31, 2020
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	$ 21,489		$ 17,864
Less: Accumulated depreciation	(5,824)		(5,117)
Property, plant and equipment, net	15,665	$ 12,702	12,747
Machinery, equipment, vehicles and office furniture [Member]
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	9,156		8,493
Tooling [Member]
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	2,038		1,811
Leasehold improvements [Member]
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	1,596		1,421
Land and buildings [Member]
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	3,725		3,662
Computer equipment, hardware and software [Member]
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	1,148		856
Construction in progress [Member]
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	$ 3,826		$ 1,621