Other Liabilities and Deferred Revenue (Details) - USD ($) $ in Millions	Sep. 30, 2016	Dec. 31, 2015
Other Liabilities [Abstract]
Dealer and Dealers' Customer Allowances and Claims	$ 9,050	$ 8,122
Deferred Revenue, Current	4,715	4,675
Deferred Compensation Liability, Current	1,505	1,562
Interest Payable, Current	761	840
Other Postretirement Defined Benefit Plan Liabilities Current	357	354
Defined Benefit Pension Plan Liabilities, Current	268	249
Other Sundry Liabilities, Current	2,875	3,287
Other Liabilities, Current	19,531	19,089
Pension (a)	9,024	9,543
OPEB	5,362	5,347
Dealer and dealers’ customer allowances and claims	3,146	2,731
Deferred revenue	3,639	3,285
Employee benefit plans	1,112	1,041
Other	1,369	1,510
Total non-current other liabilities and deferred revenue	23,652	23,457
Net pension assets	$ 2,300	$ 1,600