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Accounting Policies (Details) (USD $)
In Millions, unless otherwise specified
1 Months Ended 12 Months Ended
Dec. 31, 2012
Dec. 31, 2013
units
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Property, Plant and Equipment [Line Items]          
Fair value of our long-term debt borrowings $ 916 $ 801 $ 916    
Market value of investments 760 1,542 760 835 1,416
Deferred technology costs, gross 115 131 115    
Accumulated amortization of deferred technology costs 58 71 58    
Non-cash impairment charge   36      
Non-cash impairment charge associated with the an intangible asset acquired (26) 26 26    
Number of operating segments   4      
Cost of advertisement   $ 43 $ 34 $ 32  
Minimum [Member] | Software and Software Development Costs [Member]
         
Property, Plant and Equipment [Line Items]          
Property, plant and equipment useful life   3 years      
Minimum [Member] | Building Improvements [Member]
         
Property, Plant and Equipment [Line Items]          
Property, plant and equipment useful life   15 years      
Minimum [Member] | Equipment [Member]
         
Property, Plant and Equipment [Line Items]          
Property, plant and equipment useful life   2 years      
Maximum [Member] | Software and Software Development Costs [Member]
         
Property, Plant and Equipment [Line Items]          
Property, plant and equipment useful life   7 years      
Maximum [Member] | Building Improvements [Member]
         
Property, Plant and Equipment [Line Items]          
Property, plant and equipment useful life   40 years      
Maximum [Member] | Equipment [Member]
         
Property, Plant and Equipment [Line Items]          
Property, plant and equipment useful life   10 years