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Inventories
6 Months Ended
Jun. 30, 2017
Inventory Disclosure [Abstract]  
Inventories
Inventories
 
June 30, 2017
 
GMNA
 
GMIO
 
GMSA
 
Total
Total productive material, supplies and work in process
$
3,534

 
$
873

 
$
700

 
$
5,107

Finished product, including service parts
3,948

 
1,434

 
800

 
6,182

Total inventories
$
7,482

 
$
2,307

 
$
1,500

 
$
11,289

 
December 31, 2016
 
GMNA
 
GMIO
 
GMSA
 
Total
Total productive material, supplies and work in process
$
3,277

 
$
970

 
$
761

 
$
5,008

Finished product, including service parts
4,119

 
1,208

 
705

 
6,032

Total inventories
$
7,396

 
$
2,178

 
$
1,466

 
$
11,040