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Automotive and GM Financial Debt (Tables)
 6 Months Ended
Jun. 30, 2017
Automotive [Member]  
Debt Instrument [Line Items]  
Debt carrying amount and fair value


June 30, 2017
 
December 31, 2016
 
Carrying Amount
 
Fair Value
 
Carrying Amount
 
Fair Value
Total automotive debt
$
10,610

 
$
11,626

 
$
10,560

 
$
11,399

Fair value utilizing Level 1 inputs
 
 
$
9,679

 
 
 
$
9,515

Fair value utilizing Level 2 inputs
 
 
$
1,947

 
 
 
$
1,884
GM Financial [Member]  
Debt Instrument [Line Items]  
Debt carrying amount and fair value
 
June 30, 2017
 
December 31, 2016
 
Carrying Amount
 
Fair Value
 
Carrying Amount
 
Fair Value
Secured debt
$
38,828

 
$
38,926

 
$
35,087

 
$
35,162

Unsecured debt
39,651

 
40,645

 
29,476

 
30,045

Total GM Financial debt
$
78,479

 
$
79,571

 
$
64,563

 
$
65,207

 
 
 
 
 
 
 
 
Fair value utilizing Level 2 inputs
 
 
$
77,695

 
 
 
$
62,951

Fair value utilizing Level 3 inputs
 
 
$
1,876

 
 
 
$
2,256