Commitments and Contingencies	6 Months Ended
Jun. 30, 2018
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Guarantees of Indebtedness At June 30, 2018 and December 31, 2017, we guaranteed approximately $1.2 billion and $2.0 billion in aggregate principal amount of Euro Medium Term Notes issued by General Motors Financial International B.V., our former subsidiary, pursuant to our Euro Medium Term Note Programme. Subject to the terms and conditions of a letter agreement entered into with BNP Paribas in connection with the sale of certain of our European Operations on October 31, 2017, BNP Paribas has agreed to pay to us any amount that we may pay under any such guarantees. Legal Proceedings We are subject to various pending and potential legal and regulatory proceedings in the ordinary course of business, including litigation, arbitration, claims, investigations, examinations, subpoenas and enforcement proceedings. Some litigation against us could take the form of class actions. The outcome of these proceedings is inherently uncertain, and thus we cannot confidently predict how or when proceedings will be resolved. An adverse outcome in one or more of these proceedings could result in substantial damages, settlements, fines, penalties, diminished income or reputational harm. We identify below the material proceedings in connection with which we believe a material loss is reasonably possible or probable. In accordance with the current accounting standards for loss contingencies, we establish reserves for legal matters when it is probable that a loss associated with the matter has been incurred and the amount of the loss can be reasonably estimated. The actual costs of resolving legal matters may be higher or lower than any amounts reserved for these matters. At June 30, 2018, we estimated our reasonably possible legal exposure for unfavorable outcomes is up to $56 million, and have accrued $18 million. In 2014 and 2015, we were served with investigative subpoenas from various state attorneys general and other governmental offices to produce documents and data relating to our automobile loan and lease business and securitization of loans and leases. We believe that we have cooperated fully with all reasonable requests for information.We are currently unable to estimate any reasonably possible loss or range of loss that may result from these investigations. Other Administrative Tax Matters We accrue non-income tax liabilities for contingencies when management believes that a loss is probable and the amounts can be reasonably estimated, while contingent gains are recognized only when realized. In the event any losses are sustained in excess of accruals, they will be charged against income at that time. In evaluating indirect tax matters, we take into consideration factors such as our historical experience with matters of similar nature, specific facts and circumstances, and the likelihood of prevailing. We reevaluate and update our accruals as matters progress over time. Where there is a reasonable possibility that losses exceeding amounts already recognized may be incurred, our estimate of the additional range of loss is up to $16 million as of June 30, 2018.

Commitments and Contingencies

Guarantees of Indebtedness At June 30, 2018 and December 31, 2017, we guaranteed approximately $1.2 billion and $2.0 billion in aggregate principal amount of Euro Medium Term Notes issued by General Motors Financial International B.V., our former subsidiary, pursuant to our Euro Medium Term Note Programme. Subject to the terms and conditions of a letter agreement entered into with BNP Paribas in connection with the sale of certain of our European Operations on October 31, 2017, BNP Paribas has agreed to pay to us any amount that we may pay under any such guarantees.

Legal Proceedings We are subject to various pending and potential legal and regulatory proceedings in the ordinary course of business, including litigation, arbitration, claims, investigations, examinations, subpoenas and enforcement proceedings. Some litigation against us could take the form of class actions. The outcome of these proceedings is inherently uncertain, and thus we cannot confidently predict how or when proceedings will be resolved. An adverse outcome in one or more of these proceedings could result in substantial damages, settlements, fines, penalties, diminished income or reputational harm. We identify below the material proceedings in connection with which we believe a material loss is reasonably possible or probable.

In accordance with the current accounting standards for loss contingencies, we establish reserves for legal matters when it is probable that a loss associated with the matter has been incurred and the amount of the loss can be reasonably estimated. The actual costs of resolving legal matters may be higher or lower than any amounts reserved for these matters. At June 30, 2018, we estimated our reasonably possible legal exposure for unfavorable outcomes is up to $56 million, and have accrued $18 million.

In 2014 and 2015, we were served with investigative subpoenas from various state attorneys general and other governmental offices to produce documents and data relating to our automobile loan and lease business and securitization of loans and leases. We believe that we have cooperated fully with all reasonable requests for information.We are currently unable to estimate any reasonably possible loss or range of loss that may result from these investigations.

Other Administrative Tax Matters We accrue non-income tax liabilities for contingencies when management believes that a loss is probable and the amounts can be reasonably estimated, while contingent gains are recognized only when realized. In the event any losses are sustained in excess of accruals, they will be charged against income at that time.

In evaluating indirect tax matters, we take into consideration factors such as our historical experience with matters of similar nature, specific facts and circumstances, and the likelihood of prevailing. We reevaluate and update our accruals as matters progress over time. Where there is a reasonable possibility that losses exceeding amounts already recognized may be incurred, our estimate of the additional range of loss is up to $16 million as of June 30, 2018.