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Income Taxes Unusual or Infrequent Items (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Income Tax Disclosure [Abstract]        
Withholding taxes $ (4) $ (1) $ (4) $ (1)
Other change in tax reserves (1) [1] (1) 3 0 4
Other adjustments (2) [2] 1 1 5 1
Income tax (benefit) expense associated with unusual or infrequent items $ (4) $ 3 $ 1 $ 4
[1] For the three and six months ended June 30, 2016 and June 30, 2015, the tax (benefit) and expense, respectively, primarily relates to adjustments in tax reserves which were individually insignificant.
[2] For the three and six months ended June 30, 2016 and June 30, 2015, the tax expense primarily relates to provision to return adjustments and other items which were individually insignificant.