Other Liabilities and Deferred Revenue (Details) - USD ($) $ in Millions	Jun. 30, 2016	Dec. 31, 2015
Other Liabilities [Abstract]
Dealer and Dealers' Customer Allowances and Claims	$ 9,632	$ 8,122
Deferred Revenue, Current	5,639	4,662
Deferred Compensation Liability, Current	1,482	1,562
Interest Payable, Current	946	840
Other Postretirement Defined Benefit Plan Liabilities Current	358	354
Defined Benefit Pension Plan Liabilities, Current	266	249
Other Sundry Liabilities, Current	3,140	3,300
Other Liabilities, Current	21,463	19,089
Pension (a)	9,190	9,543
OPEB	5,392	5,347
Dealer and dealers’ customer allowances and claims	2,782	2,731
Deferred revenue	3,499	3,265
Employee benefit plans	1,112	1,041
Other	1,441	1,530
Total non-current other liabilities and deferred revenue	23,416	23,457
Net pension assets	$ 2,100	$ 1,600