Other Liabilities and Deferred Revenue (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Other Liabilities, Current [Abstract]
Dealer and dealers’ customer allowances and claims	$ 13,113	$ 11,369
Deferred revenue	2,091	2,095
Employee benefit plans	1,857	1,755
Accrued interest	1,128	988
OPEB	332	339
Pension	185	204
Operating Lease, Liability, Current	367	0
Other	3,914	3,806
Total current other liabilities and deferred revenue	22,987	20,556
Other Liabilities, Noncurrent [Abstract]
Pension	9,878	9,423
OPEB	5,740	5,220
Dealer and dealers’ customer allowances and claims	1,921	2,497
Deferred revenue	4,191	3,985
Operating lease liabilities	1,047	0
Employee benefit plans	1,104	1,080
Other	1,443	1,383
Total non-current other liabilities and deferred revenue	$ 25,324	$ 23,588