Supplemental Information for the Consolidated Statements of Cash Flows (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Accounts receivable	$ 1,402	$ (1,249)	$ (16)
Wholesale receivables funded by GM Financial, net	(2,099)	(2,184)	(820)
Inventories	440	(75)	(1,209)
Automotive equipment on operating leases	(263)	785	520
Change in other assets	108	(939)	(572)
Accounts payable	(362)	3,195	1,658
Income taxes payable	(3)	(162)	88
Accrued and other liabilities	(2,238)	1,209	(857)
Total	(3,015)	580	(1,208)
Cash paid for income taxes and interest
Cash paid for income taxes	656	676	740
Cash Paid for Interest (net of amounts capitalized)	3,072	2,221	1,537
Automotive [Member]
Cash paid for income taxes and interest
Cash Paid for Interest (net of amounts capitalized)	501	460	333
GM Financial [Member]
Cash paid for income taxes and interest
Cash Paid for Interest (net of amounts capitalized)	$ 2,571	$ 1,761	$ 1,204