Commitments and Contingencies - Narrative (Details) $ in Millions	3 Months Ended	12 Months Ended
	Sep. 30, 2021 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Mar. 31, 2022 USD ($)	Jul. 31, 2021 defect	Jun. 30, 2021 USD ($)
Loss Contingencies [Line Items]
Maximum liability, guarantees		$ 3,100		$ 3,300
Accrued Liabilities, Current and Other Liabilities, Noncurrent
Loss Contingencies [Line Items]
Estimated litigation liability		1,400		1,400
Product liability		587		600
Indirect Tax Matters
Loss Contingencies [Line Items]
Estimate of possible loss				950
Chevrolet Bolt EV Recall
Loss Contingencies [Line Items]
Probable loss accrual	$ 1,200					$ 812
Number of manufacturing defects | defect					2
Chevrolet Bolt EV Recall | LG
Loss Contingencies [Line Items]
Amount awarded to other party	$ 1,900
Patent Royalty Matters
Loss Contingencies [Line Items]
Probable loss accrual				100
Increase in accrual during period		$ 300
Korea Wage Litigation - Former Subcontract Workers
Loss Contingencies [Line Items]
Probable loss accrual				287
Estimate of possible loss				$ 109
Takata Passenger-side Airbags
Loss Contingencies [Line Items]
Increase in product warranty accrual			$ 1,100