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Stock Compensation Plans (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
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Allocated Share-based Compensation Expense $ 9 $ 12 $ 19 $ 22
Tax benefit (2) (4) (6) (7)
Total stock-based compensation (net of tax) 7 8 13 15
Restricted Stock Units (RSUs) [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Allocated Share-based Compensation Expense 9 12 19 21
Total unrecognized compensation cost related to unvested awards 83   83  
Total unrecognized compensation cost related to unvested awards, period for recognition (in years)     1 year 3 months 18 days  
Employee Stock Option [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Allocated Share-based Compensation Expense $ 0 $ 0 $ 0 $ 1