v2.4.0.8
Income Taxes Income Tax Expense & Effective Tax Rate (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Schedule of Income Taxes [Line Items]        
Income Tax Expense (Benefit) $ 62 $ 73 $ 137 $ 110
Effective Income Tax Rate, Percent 14.00% 16.00% 16.00% 14.00%
Cash Taxes Paid     $ 152 $ 120