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Income Taxes - Deferred tax assets (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Deferred tax assets attributable to:    
Employee benefit accruals $ 20 $ 20
Pension and postretirement plans 23 20
Derivative contracts 1 5
Net operating loss carryforwards 26 32
Foreign tax credit carryforwards 1  
Gross deferred tax assets 71 77
Valuation allowance (31) (34)
Net deferred tax assets 40 43
Deferred tax liabilities attributable to:    
Property, plant and equipment 177 185
Identified intangibles 39 37
Other 3 11
Gross deferred tax liabilities 219 233
Net deferred tax liabilities $ 179 $ 190