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Stock-Based Compensation Stock Based Compensation Expense (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]        
Unrecognized compensation cost $ 53   $ 53  
Remaining weighted average period     1 year 2 months  
Stock-based compensation expense $ 14 $ 11 $ 40 $ 32