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Income Taxes Income Tax Unusual or Infrequent Items (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Income Tax Disclosure [Abstract]        
Tax credits $ 0 $ (2) $ 0 $ (2)
Withholding Taxes (1) (1) (1) (1)
Other Change in Tax Reserves (1) [1] 3 (3) 4 (6)
Other Adjustments (2) [2] 1 (4) 1 (5)
Income Tax Expense (Benefit) associated with unusual or infrequent items $ 3 $ (10) $ 4 $ (14)
[1] For the three and six months ended June 30, 2015 and June 30, 2014, the tax expense and benefit, respectively, primarily relate to adjustments in tax reserves which were individually insignificant.
[2] For the three and six months ended June 30, 2015 and June 30, 2014, the tax expense and benefit, respectively, primarily relate to items which were individually insignificant.