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Income Taxes (Deferred Tax Liabilities and Assets) (Details) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Deferred Tax Liabilities    
Properties, plants and equipment, and intangibles $ 4,525 $ 4,361
Investment in joint ventures 2,442 2,292
Investment in subsidiaries 803 236
Inventory 154 176
Other 19 24
Total deferred tax liabilities 7,943 7,089
Deferred Tax Assets    
Benefit plan accruals 669 751
Asset retirement obligations and accrued environmental costs 211 215
Other financial accruals and deferrals 188 175
Loss and credit carryforwards 261 227
Other 1 1
Total deferred tax assets 1,330 1,369
Less: valuation allowance 38 160
Net deferred tax assets 1,292 1,209
Net deferred tax liabilities $ 6,651 $ 5,880