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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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