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Inventories
3 Months Ended
Mar. 31, 2017
Inventory Disclosure [Abstract]  
Inventories
Inventories
 
March 31, 2017
 
GMNA
 
GME
 
GMIO
 
GMSA
 
Total
Total productive material, supplies and work in process
$
3,525

 
$
704

 
$
999

 
$
786

 
$
6,014

Finished product, including service parts
4,073

 
2,625

 
1,231

 
743

 
8,672

Total inventories
$
7,598

 
$
3,329

 
$
2,230

 
$
1,529

 
$
14,686

 
December 31, 2016
 
GMNA
 
GME
 
GMIO
 
GMSA
 
Total
Total productive material, supplies and work in process
$
3,226

 
$
684

 
$
974

 
$
759

 
$
5,643

Finished product, including service parts
4,108

 
2,229

 
1,107

 
701

 
8,145

Total inventories
$
7,334

 
$
2,913

 
$
2,081

 
$
1,460

 
$
13,788