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Commitments and Contingencies - Litigation-Related Liability and Tax Administrative Matters (Details) $ in Millions	3 Months Ended	12 Months Ended
	Jun. 30, 2021 USD ($)	Dec. 31, 2019 USD ($) numberOfLitigationCase	Dec. 31, 2020 USD ($)
Accrued Liabilities, Current and Other Liabilities, Noncurrent
Loss Contingencies [Line Items]
Estimated litigation liability	$ 1,200		$ 1,200
Indirect Tax Matters
Loss Contingencies [Line Items]
Estimate of possible loss	900
Chevrolet Bolt EV Recall
Loss Contingencies [Line Items]
Probable loss accrual	812
Korea Wage Litigation - Salaried
Loss Contingencies [Line Items]
Loss Contingency Accrual, Period Increase (Decrease)	107
Probable loss accrual	134
Korea Wage Litigation - Former Subcontract Workers
Loss Contingencies [Line Items]
Probable loss accrual	260
Estimate of possible loss	$ 120
Foreign Tax Authority | Brazil
Loss Contingencies [Line Items]
Number of rendered favorable decisions | numberOfLitigationCase		3
Estimated potential recovery from taxing authority		$ 1,400

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