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Income Taxes (Deferred Income Tax Assets (Liabilities)) (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Income Tax Disclosure [Abstract]    
Pension and other postretirement benefits $ 312 $ 499
Tax credits and loss carryforwards 470 450
Derivatives and unrealized exchange gains and losses 63 32
Share based compensation 47 86
Other 308 480
Deferred Tax Assets, Gross 1,200 1,547
Valuation allowances (176) (225)
Total deferred tax assets 1,024 1,322
Property, plant and equipment, net 818 1,079
Investments in subsidiaries 117 190
Goodwill 83 83
Other 186 268
Total deferred tax liabilities 1,204 1,620
Net deferred tax assets (liabilities) $ (180) $ (298)