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Income Taxes (Deferred Income Tax Assets (Liabilities)) (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Income Tax Disclosure [Abstract]    
Pension and other postretirement benefits $ 252 $ 312
Tax credits and loss carryforwards 387 470
Derivatives and unrealized exchange gains and losses 37 63
Other 412 355
Deferred Tax Assets, Gross 1,088 1,200
Valuation allowances (220) (176)
Total deferred tax assets 868 1,024
Property, plant and equipment, net 789 818
Investments in subsidiaries 102 117
Goodwill 72 83
Other 143 186
Total deferred tax liabilities 1,106 1,204
Net deferred tax assets (liabilities) $ (238) $ (180)