Other Liabilities and Deferred Revenue (Details) - USD ($) $ in Millions	Sep. 30, 2017	Jan. 01, 2017	Dec. 31, 2016
Other Liabilities [Abstract]
Dealer and Dealers' Customer Allowances and Claims	$ 10,489		$ 9,542
Deferred Revenue, Current	2,409		3,866
Deferred Compensation Liability, Current	1,718		1,469
Interest Payable, Current	833		974
Other Postretirement Defined Benefit Plan Liabilities Current	354		349
Defined Benefit Pension Plan Liabilities, Current	260		247
Other Sundry Liabilities, Current	3,549		2,869
Other Liabilities, Current	19,612	$ 17,887	19,316
Pension (a)	10,251		10,150
OPEB (a)	5,582		5,516
Dealer and dealers’ customer allowances and claims	2,490		2,564
Deferred revenue	3,806		3,687
Employee benefit plans	1,131		1,063
Other	1,559		1,415
Total non-current other liabilities and deferred revenue	24,819	$ 24,390	24,395
Net pension assets	$ 2,500		$ 1,500