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GM Financial Receivables and Transactions (Tables) - GM Financial [Member] | 9 Months Ended
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Sep. 30, 2018
Finance Receivables [Line Items] |
GM Financial Receivables |
| September 30, 2018 |  | December 31, 2017
| Retail |  | Commercial |  | Total |  | Retail |  | Commercial |  | Total
Finance receivables, collectively evaluated for impairment, net of fees | $ | 35,442 |  |  | $ | 10,601 |  |  | $ | 46,043 |  |  | $ | 30,486 |  |  | $ | 9,935 |  |  | $ | 40,421 |
Finance receivables, individually evaluated for impairment, net of fees | 2,308 |  |  | 67 |  |  | 2,375 |  |  | 2,228 |  |  | 22 |  |  | 2,250 |
GM Financial receivables | 37,750 |  |  | 10,668 |  |  | 48,418 |  |  | 32,714 |  |  | 9,957 |  |  | 42,671 |
Less: allowance for loan losses | (839 | ) |  | (61 | ) |  | (900 | ) |  | (889 | ) |  | (53 | ) |  | (942 | )
GM Financial receivables, net | $ | 36,911 |  |  | $ | 10,607 |  |  | $ | 47,518 |  |  | $ | 31,825 |  |  | $ | 9,904 |  |  | $ | 41,729 |
Fair value of GM Financial receivables utilizing Level 2 inputs |  |  |  |  |  |  | $ | 10,607 |  |  |  |  |  |  |  |  | $ | 9,904 |
Fair value of GM Financial receivables utilizing Level 3 inputs |  |  |  |  | $ | 36,551 |  |  |  |  |  |  | $ | 31,831 |
Allowance for Loan Losses |
| Three Months Ended |  | Nine Months Ended
| September 30, 2018 |  | September 30, 2017 |  | September 30, 2018 |  | September 30, 2017
Allowance for loan losses at beginning of period | $ | 873 |  |  | $ | 893 |  |  | $ | 942 |  |  | $ | 805 |
Provision for loan losses | 180 |  |  | 204 |  |  | 444 |  |  | 573 |
Charge-offs | (285 | ) |  | (287 | ) |  | (878 | ) |  | (858 | )
Recoveries | 130 |  |  | 135 |  |  | 398 |  |  | 420 |
Effect of foreign currency | 2 |  |  | 3 |  |  | (6 | ) |  | 8 |
Allowance for loan losses at end of period | $ | 900 |  |  | $ | 948 |  |  | $ | 900 |  |  | $ | 948 |
Intercompany Transactions | The following table shows transactions between our Automotive segments and GM Financial. These amounts are shown in GM Financial's condensed consolidated balance sheets and statements of income. All balance sheet amounts in the table below are eliminated. Income statement amounts may not fully eliminate due to timing.
| September 30, 2018 |  | December 31, 2017
Condensed Consolidated Balance Sheets |  |  |
Commercial finance receivables, net due from GM consolidated dealers | $ | 437 |  |  | $ | 355 |
Direct-financing lease receivables from GM subsidiaries | $ | 125 |  |  | $ | 88 |
Subvention receivable(a) | $ | 735 |  |  | $ | 306 |
Commercial loan funding payable | $ | 86 |  |  | $ | 90 |
| Three Months Ended |  | Nine Months Ended
| September 30, 2018 |  | September 30, 2017 |  | September 30, 2018 |  | September 30, 2017
Condensed Consolidated Statements of Income |  |  |  |  |  |  |
Interest subvention earned on finance receivables | $ | 142 |  |  | $ | 129 |  |  | $ | 409 |  |  | $ | 361 |
Leased vehicle subvention earned | $ | 827 |  |  | $ | 786 |  |  | $ | 2,438 |  |  | $ | 2,246 |
__________
(a) | Cash paid by Automotive segments to GM Financial for subvention was $1.1 billion for the three months ended September 30, 2018 and 2017 and $2.8 billion and $3.3 billion for the nine months ended September 30, 2018 and 2017.
Retail Finance Receivables [Member] |
Finance Receivables [Line Items] |
Retail Finance Receivables Delinquency | The following table summarizes the contractual amount of delinquent retail finance receivables, which is not significantly different than the recorded investment of the retail finance receivables:
| September 30, 2018 |  | September 30, 2017
| Amount |  | Percent of Contractual Amount Due |  | Amount |  | Percent of Contractual Amount Due
31-to-60 days delinquent | $ | 1,302 |  |  | 3.5 | % |  | $ | 1,176 |  |  | 3.6 | %
Greater-than-60 days delinquent | 498 |  |  | 1.3 | % |  | 521 |  |  | 1.6 | %
Total finance receivables more than 30 days delinquent | 1,800 |  |  | 4.8 | % |  | 1,697 |  |  | 5.2 | %
In repossession | 53 |  |  | 0.1 | % |  | 55 |  |  | 0.2 | %
Total finance receivables more than 30 days delinquent or in repossession | $ | 1,853 |  |  | 4.9 | % |  | $ | 1,752 |  |  | 5.4 | %
Commercial Finance Receivables [Member] |
Finance Receivables [Line Items] |
Commercial Finance Receivables Credit Quality | The following table summarizes the credit risk profile by dealer risk rating of the commercial finance receivables:
|  | September 30, 2018 |  | December 31, 2017
Group I | – Dealers with superior financial metrics | $ | 2,077 |  |  | $ | 1,915 |
Group II | – Dealers with strong financial metrics | 3,905 |  |  | 3,465 |
Group III | – Dealers with fair financial metrics | 3,197 |  |  | 3,239 |
Group IV | – Dealers with weak financial metrics | 960 |  |  | 997 |
Group V | – Dealers warranting special mention due to elevated risks | 422 |  |  | 260 |
Group VI | – Dealers with loans classified as substandard, doubtful or impaired | 107 |  |  | 81 |
|  | $ | 10,668 |  |  | $ | 9,957 |

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