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Income Taxes - Deferred Tax Assets and Liabilities Temporary Differences (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Deferred income tax assets:    
Accrued postretirement and postemployment benefits $ 137 $ 150
Accrued pension costs 251 272
Other employee benefits 151 160
Accrued expenses 420 287
Loss carryforwards 648 589
Tax credit carryforwards 790 729
Other 535 438
Total deferred income tax assets 2,932 2,625
Valuation allowance (1,277) (1,243)
Net deferred income tax assets 1,655 1,382
Deferred income tax liabilities:    
Intangible assets, including impact from Swiss tax reform (2,951) (2,772)
Property, plant and equipment (747) (663)
Other (513) (559)
Total deferred income tax liabilities (4,211) (3,994)
Net deferred income tax liabilities $ (2,556) $ (2,612)