XML 48 R55.htm IDEA: XBRL DOCUMENT v3.19.3.a.u2
NATURE OF OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Revenue Recognition, Narrative (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Concentration Risk [Line Items]      
Advertising arrangement contract terms The term of our advertising arrangements is generally less than one year and the timing between when an advertisement is aired and when payment is due is not significant.    
Deferred revenue $ 54 $ 83 $ 50
Deferred revenue, revenue recognized $ 76 $ 39  
Revenue Benchmark | Customer One | Customer Concentration Risk      
Concentration Risk [Line Items]      
Concentration percentage 16.00%    
Revenue Benchmark | Customer Two | Customer Concentration Risk      
Concentration Risk [Line Items]      
Concentration percentage 13.00%    
Revenue Benchmark | Customer Three | Customer Concentration Risk      
Concentration Risk [Line Items]      
Concentration percentage 10.00%