Summary of Significant Accounting Policies	9 Months Ended
Sep. 30, 2017
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	Summary of Significant Accounting Policies Basis of Presentation The condensed consolidated financial statements include our accounts and the accounts of our consolidated subsidiaries, including certain special-purpose financing entities utilized in secured financing transactions, which are considered variable interest entities (VIEs). We consolidate certain operating entities that provide auto finance and financial services, which we do not control through a majority voting interest. We manage these entities and maintain a controlling financial interest in them and are exposed to the risks of ownership through contractual arrangements. The majority voting interests in these entities are indirectly wholly-owned by our parent, General Motors Company (GM). All intercompany transactions and balances have been eliminated in consolidation. Our operations in Europe are presented as discontinued operations, and the related assets and liabilities are presented as held for sale in our condensed consolidated financial statements for all periods presented. Unless otherwise indicated, information in these notes to the condensed consolidated financial statements relates to continuing operations. Refer to Note 2 - "Discontinued Operations" for additional details regarding our planned disposal of these operations. The condensed consolidated financial statements, including the notes thereto, are condensed and do not include all disclosures required by generally accepted accounting principles (GAAP) in the United States of America. These condensed consolidated financial statements should be read in conjunction with the audited consolidated financial statements that are included in our Annual Report on Form 10-K filed on February 7, 2017 (Form 10-K). Except as otherwise specified, dollar amounts presented within tables are stated in millions. The condensed consolidated financial statements at September 30, 2017, and for the three and nine months ended September 30, 2017 and 2016, are unaudited and, in management’s opinion, include all adjustments, which consist of normal recurring adjustments and transactions or events discretely impacting the interim periods, considered necessary by management to fairly state our results of operations. The results for interim periods are not necessarily indicative of results for a full year. In August 2017, the Financial Accounting Standards Board (FASB) issued Accounting Standard Update 2017-12, "Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities" (ASU 2017-12), which simplifies the application of hedge accounting and more closely aligns hedge accounting with companies' risk management strategies thereby making more hedging strategies eligible for hedge accounting. ASU 2017-12 is effective for fiscal years beginning after December 15, 2018, and interim periods within those fiscal years, with early adoption permitted. ASU 2017-12 requires a cumulative-effect adjustment for certain items upon adoption. We are currently evaluating the impact the adoption of ASU 2017-12 will have on our consolidated financial statements. Segment Information We are the wholly-owned captive finance subsidiary of GM. We offer substantially similar products and services throughout many different regions, subject to local regulations and market conditions. We evaluate our business in two operating segments. The North America Segment includes our operations in the U.S. and Canada. The International Segment includes our operations in Brazil, Chile, Colombia, Mexico and Peru as well as our equity investment in SAIC-GMAC Automotive Finance Company Limited (SAIC-GMAC), a joint venture that conducts auto finance operations in China.

Summary of Significant Accounting Policies

Basis of Presentation The condensed consolidated financial statements include our accounts and the accounts of our consolidated subsidiaries, including certain special-purpose financing entities utilized in secured financing transactions, which are considered variable interest entities (VIEs). We consolidate certain operating entities that provide auto finance and financial services, which we do not control through a majority voting interest. We manage these entities and maintain a controlling financial interest in them and are exposed to the risks of ownership through contractual arrangements. The majority voting interests in these entities are indirectly wholly-owned by our parent, General Motors Company (GM). All intercompany transactions and balances have been eliminated in consolidation.

Our operations in Europe are presented as discontinued operations, and the related assets and liabilities are presented as held for sale in our condensed consolidated financial statements for all periods presented. Unless otherwise indicated, information in these notes to the condensed consolidated financial statements relates to continuing operations. Refer to Note 2 - "Discontinued Operations" for additional details regarding our planned disposal of these operations.

The condensed consolidated financial statements, including the notes thereto, are condensed and do not include all disclosures required by generally accepted accounting principles (GAAP) in the United States of America. These condensed consolidated financial statements should be read in conjunction with the audited consolidated financial statements that are included in our Annual Report on Form 10-K filed on February 7, 2017 (Form 10-K). Except as otherwise specified, dollar amounts presented within tables are stated in millions.

The condensed consolidated financial statements at September 30, 2017, and for the three and nine months ended September 30, 2017 and 2016, are unaudited and, in management’s opinion, include all adjustments, which consist of normal recurring adjustments and transactions or events discretely impacting the interim periods, considered necessary by management to fairly state our results of operations. The results for interim periods are not necessarily indicative of results for a full year.

In August 2017, the Financial Accounting Standards Board (FASB) issued Accounting Standard Update 2017-12, "Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities" (ASU 2017-12), which simplifies the application of hedge accounting and more closely aligns hedge accounting with companies' risk management strategies thereby making more hedging strategies eligible for hedge accounting. ASU 2017-12 is effective for fiscal years beginning after December 15, 2018, and interim periods within those fiscal years, with early adoption permitted. ASU 2017-12 requires a cumulative-effect adjustment for certain items upon adoption. We are currently evaluating the impact the adoption of ASU 2017-12 will have on our consolidated financial statements.

Segment Information We are the wholly-owned captive finance subsidiary of GM. We offer substantially similar products and services throughout many different regions, subject to local regulations and market conditions. We evaluate our business in two operating segments. The North America Segment includes our operations in the U.S. and Canada. The International Segment includes our operations in Brazil, Chile, Colombia, Mexico and Peru as well as our equity investment in SAIC-GMAC Automotive Finance Company Limited (SAIC-GMAC), a joint venture that conducts auto finance operations in China.