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Employee Stock Compensation Plans - Other Share-based Plans (Details) (Employee Stock [Member], USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Employee Stock [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
ESPP discount 5.00%    
Employees may authorize payroll deductions of up to 10.00%    
Employees purchased (in shares) 0.2 0.3 0.3
Employees purchased $ 6 $ 6 $ 5
Shares authorized (in shares) 4    
Shares remain unissued (in shares) 1.7