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Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Deferred tax assets    
Postretirement benefits other than pensions $ 1,572 $ 1,742
Pension and other employee benefit plans 1,540 2,999
Warranties, dealer and customer allowances, claims and discounts 4,253 5,538
Miscellaneous 3,468 3,479
Total deferred tax assets before valuation allowances 31,670 34,991
Less: valuation allowances (8,855) (9,095)
Total deferred tax assets 22,815 25,896
Deferred tax liabilities    
Property, plant and equipment 1,775 1,670
Intangible assets 729 744
Total deferred tax liabilities 2,504 2,414
Net deferred tax assets 20,311 23,482
U.S.    
Deferred tax assets    
U.S. capitalized research expenditures 7,285 6,763
Operating loss and tax credit carryforwards 6,959 7,254
Deferred tax liabilities    
Operating loss and tax credit carryforwards subject to expiration 6,500  
Operating loss and tax credit carryforwards not subject to expiration 450  
Non-U.S.    
Deferred tax assets    
Operating loss and tax credit carryforwards 6,593 7,216
Deferred tax liabilities    
Operating loss and tax credit carryforwards subject to expiration 1,200  
Operating loss and tax credit carryforwards not subject to expiration 5,400  
Germany, Spain, South Korea and the U.S.    
Deferred tax assets    
Less: valuation allowances $ (8,900) $ (9,100)