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Automotive and GM Financial Debt (Tables)
 9 Months Ended
Sep. 30, 2018
Automotive [Member]  
Debt Instrument [Line Items]  
Debt carrying amount and fair value


September 30, 2018
 
December 31, 2017
 
Carrying Amount
 
Fair Value
 
Carrying Amount
 
Fair Value
Total automotive debt
$
15,963

 
$
16,352

 
$
13,502

 
$
15,088

Fair value utilizing Level 1 inputs
 
 
$
13,971

 
 
 
$
13,202

Fair value utilizing Level 2 inputs
 
 
$
2,381

 
 
 
$
1,886
GM Financial [Member]  
Debt Instrument [Line Items]  
Debt carrying amount and fair value
 
September 30, 2018
 
December 31, 2017
 
Carrying Amount
 
Fair Value
 
Carrying Amount
 
Fair Value
Secured debt
$
39,722


$
39,679


$
39,887


$
39,948

Unsecured debt
46,655


47,062


40,830


41,989

Total GM Financial debt
$
86,377


$
86,741


$
80,717


$
81,937

 


 




 
Fair value utilizing Level 2 inputs


$
84,693





$
79,623

Fair value utilizing Level 3 inputs


$
2,048





$
2,314