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Income Taxes - Deferred taxes (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Deferred tax assets attributable to:    
Employee benefit accruals $ 23 $ 20
Pension and postretirement plans 22 23
Lease liabilities 39  
Derivative contracts 2 1
Net operating loss carryforwards 24 26
Foreign tax credit carryforwards 1 1
Gross deferred tax assets 111 71
Valuation allowance (29) (31)
Net deferred tax assets 82 40
Deferred tax liabilities attributable to:    
Property, plant and equipment 175 177
Identified intangibles 41 39
Right-of-use lease assets 37  
Other 11 3
Gross deferred tax liabilities 264 219
Net deferred tax liabilities $ 182 $ 179