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Deferred Revenue - Schedule of Rollforward (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Disaggregation Of Revenue [Roll Forward]    
Beginning balance $ 217 $ 216
Additions 728 727
Amortization (613) (604)
Ending balance 332 339
Annual Listings Revenues    
Disaggregation Of Revenue [Roll Forward]    
Beginning balance 0 0
Additions 387 383
Amortization (289) (288)
Ending balance 98 95
Original Listings Revenues    
Disaggregation Of Revenue [Roll Forward]    
Beginning balance 25 25
Additions 11 17
Amortization (17) (17)
Ending balance 19 25
Other Listings Revenues    
Disaggregation Of Revenue [Roll Forward]    
Beginning balance 100 98
Additions 30 36
Amortization (30) (27)
Ending balance 100 107
Data Services and Other Revenues    
Disaggregation Of Revenue [Roll Forward]    
Beginning balance 92 93
Additions 300 291
Amortization (277) (272)
Ending balance $ 115 $ 112