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Automotive and GM Financial Debt (Tables)
 3 Months Ended
Mar. 31, 2018
Automotive [Member]  
Debt Instrument [Line Items]  
Debt carrying amount and fair value


March 31, 2018
 
December 31, 2017
 
Carrying Amount
 
Fair Value
 
Carrying Amount
 
Fair Value
Total automotive debt
$
15,298

 
$
16,141

 
$
13,502

 
$
15,088

Fair value utilizing Level 1 inputs
 
 
$
12,484

 
 
 
$
13,202

Fair value utilizing Level 2 inputs
 
 
$
3,657

 
 
 
$
1,886
GM Financial [Member]  
Debt Instrument [Line Items]  
Debt carrying amount and fair value
 
March 31, 2018
 
December 31, 2017
 
Carrying Amount

Fair Value

Carrying Amount

Fair Value
Secured debt
$
39,441


$
39,395


$
39,887


$
39,948

Unsecured debt
44,079


44,738


40,830


41,989

Total GM Financial debt
$
83,520


$
84,133


$
80,717


$
81,937

 








Fair value utilizing Level 2 inputs


$
81,931





$
79,623

Fair value utilizing Level 3 inputs


$
2,202





$
2,314