Other Liabilities and Deferred Revenue (Details) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Accounts Payable and Accrued Liabilities, Current [Abstract]
Dealer and dealers’ customer allowances and claims	$ 8,134	$ 8,300
Deferred revenue	2,328	2,349
Employee benefit plans	1,289	1,687
Accrued interest	781	888
OPEB (a)	333	332
Pension (a)	202	202
Operating lease liabilities	351	345
Other	4,845	4,583
Total current other liabilities and deferred revenue	18,263	18,686
Accounts Payable and Accrued Liabilities, Noncurrent [Abstract]
Pension (a)	8,407	8,658
OPEB (a)	5,669	5,708
Dealer and dealers’ customer allowances and claims	5,076	4,909
Deferred revenue	4,864	4,683
Operating lease liabilities	1,032	1,048
Employee benefit plans	990	1,007
Other	2,463	1,692
Total non-current other liabilities and deferred revenue	28,501	27,705
Net pension assets	$ 8,800	$ 8,500