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Accounting Policies (Details)
12 Months Ended
Dec. 31, 2017
USD ($)
units
Segment
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Property, Plant and Equipment [Line Items]        
Number of reportable segments | Segment 3      
Market value of cash and cash equivalents $ 2,779,000,000 $ 2,392,000,000 $ 1,481,000,000 $ 2,497,000,000
Deferred technology costs, gross 186,000,000 145,000,000    
Accumulated amortization of deferred technology costs 104,000,000 91,000,000    
Fair value of our long-term debt borrowings 3,800,000,000 3,700,000,000    
Non-cash impairment charge associated with finite-lived intangible assets $ 24,000,000 24,000,000    
Number of reporting units | units 4      
Cost of advertisement $ 33,000,000 35,000,000 33,000,000  
Undistributed accumulated earnings of foreign subsidiary $ 2,600,000,000      
Percent of undistributed accumulated earnings of foreign subsidiary not to be reinvested (more than) 70.00%      
Amount of undistributed accumulated earnings of foreign subsidiary to be reinvested $ 780,000,000      
Income tax benefit from TCJA 2017 25,000,000 24,000,000 3,000,000  
Goodwill impairment 0 0 0  
Indefinite-lived intangible asset impairment 0 0 0  
Excess tax benefit from share-based compensation, operating activities 72,000,000      
Excess tax benefit from share-based compensation, financing activities (49,000,000) (55,000,000) (92,000,000)  
Employee service share-based compensation, cash payments to settle awards 49,000,000      
Impact of restatement on opening retained earnings 40,000,000      
Capitalized contract costs 79,000,000      
Deferred revenue 14,000,000      
Net impact of recording expense associated with noncurrent deferred revenue 12,000,000      
Increase (decrease) in income taxes $ 13,000,000      
Minimum | Software and Software Development Costs        
Property, Plant and Equipment [Line Items]        
Property, plant and equipment useful life 3 years      
Minimum | Building Improvements        
Property, Plant and Equipment [Line Items]        
Property, plant and equipment useful life 15 years      
Minimum | Equipment        
Property, Plant and Equipment [Line Items]        
Property, plant and equipment useful life 2 years      
Maximum | Software and Software Development Costs        
Property, Plant and Equipment [Line Items]        
Property, plant and equipment useful life 7 years      
Maximum | Building Improvements        
Property, Plant and Equipment [Line Items]        
Property, plant and equipment useful life 40 years      
Maximum | Equipment        
Property, Plant and Equipment [Line Items]        
Property, plant and equipment useful life 10 years      
Previously Reported        
Property, Plant and Equipment [Line Items]        
Excess tax benefit from share-based compensation, financing activities   (41,000,000) (69,000,000)  
Employee service share-based compensation, cash payments to settle awards   (55,000,000) (92,000,000)  
Restatement Adjustment        
Property, Plant and Equipment [Line Items]        
Excess tax benefit from share-based compensation, operating activities   41,000,000 69,000,000  
Employee service share-based compensation, cash payments to settle awards   $ 55,000,000 $ 92,000,000