Inventories (Notes)
3 Months Ended
Mar. 31, 2016
Inventory Disclosure [Abstract]  
Inventories [Text Block]
Inventories
 
March 31, 2016
 
GMNA
 
GME
 
GMIO
 
GMSA
 
Total
Total productive material, supplies and work in process
$
3,407

 
$
782

 
$
1,158

 
$
787

 
$
6,134

Finished product, including service parts
5,379

 
2,641

 
1,110

 
553

 
9,683

Total inventories
$
8,786

 
$
3,423

 
$
2,268

 
$
1,340

 
$
15,817


 
December 31, 2015
 
GMNA
 
GME
 
GMIO
 
GMSA
 
Total
Total productive material, supplies and work in process
$
2,705

 
$
713

 
$
1,113

 
$
616

 
$
5,147

Finished product, including service parts
4,884

 
2,166

 
954

 
613

 
8,617

Total inventories
$
7,589

 
$
2,879

 
$
2,067

 
$
1,229

 
$
13,764