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Accounting Policies - Narrative (Details)
1 Months Ended 3 Months Ended 12 Months Ended
Apr. 30, 2018
USD ($)
Dec. 31, 2018
USD ($)
Sep. 30, 2018
USD ($)
Jun. 30, 2018
USD ($)
Mar. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Sep. 30, 2017
USD ($)
Jun. 30, 2017
USD ($)
Mar. 31, 2017
USD ($)
Dec. 31, 2018
USD ($)
units
Segment
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Jan. 01, 2019
USD ($)
Jan. 01, 2018
USD ($)
Property, Plant and Equipment [Line Items]                            
Number of reportable segments | Segment                   4        
Consideration paid for acquisition, net of cash acquired                   $ 0        
Retained earnings (accumulated deficit)   $ 11,284,000,000       $ 10,023,000,000       11,284,000,000 $ 10,023,000,000      
Total revenue   1,536,000,000 $ 1,546,000,000 $ 1,609,000,000 $ 1,567,000,000 1,589,000,000 $ 1,513,000,000 $ 1,509,000,000 $ 1,453,000,000 6,258,000,000 6,063,000,000 $ 5,661,000,000    
Contract assets   26,000,000       17,000,000       26,000,000 17,000,000      
Remaining performance obligations   1,400,000,000               $ 1,400,000,000        
Revenue recognized next year (as a percent)                   50.00%        
Revenue recognized within two years (as a percent)                   75.00%        
Market value of cash and cash equivalents   1,917,000,000       2,777,000,000       $ 1,917,000,000 2,777,000,000      
Gross deferred technology costs   205,000,000       186,000,000       205,000,000 186,000,000      
Accumulated amortization of deferred technology costs   105,000,000       104,000,000       105,000,000 104,000,000      
Fair value of our long-term debt borrowings   3,800,000,000       3,800,000,000       $ 3,800,000,000 3,800,000,000      
Non-cash impairment charge associated with finite-lived intangible assets                       24,000,000    
Number of reporting units | units                   4        
Cost of advertisement                   $ 33,000,000 33,000,000 35,000,000    
Undistributed accumulated earnings of foreign subsidiary   2,300,000,000               2,300,000,000        
Undistributed accumulated earnings of foreign subsidiary to be indefinitely reinvested   784,000,000               784,000,000        
Goodwill impairment                   0 0 0    
Indefinite-lived intangible asset impairment                   0 0 0    
Accumulated other comprehensive income (loss)   (742,000,000)       $ (649,000,000)       $ (742,000,000) (649,000,000)      
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        
Kensho Technologies                            
Property, Plant and Equipment [Line Items]                            
Consideration paid for acquisition, net of cash acquired $ 550,000,000                          
Restricted cash   32,000,000               $ 32,000,000        
Accounting Standards Update 2014-09                            
Property, Plant and Equipment [Line Items]                            
Total revenue                   6,000,000        
Accounting Standards Update 2016-01                            
Property, Plant and Equipment [Line Items]                            
Retained earnings (accumulated deficit)                           $ (10,000,000)
Accumulated other comprehensive income (loss)                           10,000,000
Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09                            
Property, Plant and Equipment [Line Items]                            
Retained earnings (accumulated deficit)                           35,000,000
Accounts receivable, net of allowance for doubtful accounts                           $ 1,319,000,000
Unearned revenue recognized                   1,500,000,000        
Capitalized contract costs   $ 101,000,000               101,000,000        
Non-transaction                            
Property, Plant and Equipment [Line Items]                            
Total revenue                   1,381,000,000 1,338,000,000 1,259,000,000    
Intersegment Elimination                            
Property, Plant and Equipment [Line Items]                            
Total revenue                   (125,000,000) (110,000,000) (98,000,000)    
Intersegment Elimination | Non-transaction                            
Property, Plant and Equipment [Line Items]                            
Total revenue                   $ 125,000,000 $ 110,000,000 $ 98,000,000    
Forecast | Accounting Standards Update 2016-02                            
Property, Plant and Equipment [Line Items]                            
Lease liability                         $ 700,000,000  
Right-of-use asset                         $ 700,000,000