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Commitments and Contingencies - Litigation-Related Liability and Tax Administrative Matters (Details) $ in Millions | 3 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2021 USD ($) | Dec. 31, 2019 USD ($) numberOfLitigationCase | Jul. 31, 2021 defect | Jun. 30, 2021 USD ($) | Dec. 31, 2020 USD ($)
Accrued Liabilities, Current and Other Liabilities, Noncurrent |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Estimated litigation liability | $ 1,100 |  |  |  | $ 1,200
Indirect Tax Matters |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Estimate of possible loss | 850 |  |  |  |
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 |  |  |  |
Korea Wage Litigation - Salaried |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Probable loss accrual | 110 |  |  |  |
Korea Wage Litigation - Former Subcontract Workers |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Probable loss accrual | 267 |  |  |  |
Estimate of possible loss | $ 111 |  |  |  |
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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- Definition Aggregate carrying amount of the estimated litigation liability for known or estimated probable loss from litigation, which may include attorneys' fees and other litigation costs. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121557415&loc=d3e14326-108349 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.25) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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