Slicers (applies to each fact value in each table cell)

Reporting Entity [Axis]

0001467858 (http://www.sec.gov/CIK)

Inventory Disclosure [Abstract]	Period [Axis]
	2016-01-01 - 2016-12-31
Inventory Disclosure [Abstract]
Components of Inventories [Table Text Block]	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   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