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Income Taxes Income Tax Expense & Effective Tax Rate (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]        
Income tax expense $ 84 $ 80 $ 159 $ 141
Effective tax rate 24.00% 18.00% 21.00% 17.00%
Cash taxes paid     $ 157 $ 149