Discontinued Operations - Financial Information for Assets and Liabilities of Businesses Held for Sale (Details) - USD ($) $ in Millions	Jun. 30, 2017	Dec. 31, 2016
ASSETS
Total assets held for sale	$ 11,689	$ 10,951
LIABILITIES
Total liabilities held for sale	10,472	9,693
General Motors Holdings LLC [Member] | Discontinued Operations, Held-for-sale [Member]
ASSETS
Cash and cash equivalents	288	386
Finance receivables, net	10,696	9,715
Related party receivables	190	163
Other assets	515	687
Total assets held for sale	11,689	10,951
LIABILITIES
Secured debt	4,733	4,183
Unsecured debt	5,278	5,130
Related party payables	138	80
Other liabilities	323	300
Total liabilities held for sale	$ 10,472	$ 9,693