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Income Taxes - Deferred Tax Assets and Liabilities Temporary Differences (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Deferred income tax assets:    
Accrued postretirement and postemployment benefits $ 147 $ 191
Accrued pension costs 349 313
Other employee benefits 147 155
Accrued expenses 283 269
Loss carryforwards 707 773
Tax credit carryforwards 747 370
Other 302 342
Total deferred income tax assets 2,682 2,413
Valuation allowance (1,153) (853)
Net deferred income tax assets 1,529 1,560
Deferred income tax liabilities:    
Intangible assets (3,861) (3,977)
Property, plant and equipment (473) (452)
Other (492) (153)
Total deferred income tax liabilities (4,826) (4,582)
Net deferred income tax liabilities $ (3,297) $ (3,022)