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Stock-Based Compensation (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Stock-based compensation        
Pre-tax compensation expense $ 6 $ 13 $ 15 $ 23
Income tax benefit $ 3 $ 5 $ 6 $ 9
Tax rate (as a percent) 37.00% 37.00% 37.00% 37.00%
Long-term stock awards        
Stock-based compensation        
Pre-tax compensation expense $ 7 $ 7 $ 12 $ 13
Stock Options        
Stock-based compensation        
Pre-tax compensation expense 0 3 1 4
Phantom stock awards and stock appreciation rights        
Stock-based compensation        
Pre-tax compensation expense $ (1) $ 3 $ 2 $ 6