v3.20.2
Revenue from Contracts with Customers (Tables)
 6 Months Ended
Jun. 30, 2020
Revenue from Contract with Customer [Abstract]  
Schedule of Disaggregation of Revenue ostpaid service revenues, including postpaid phone revenues and postpaid other revenues, were as follows:
Three Months Ended June 30,Six Months Ended June 30,
(in millions)2020201920202019
Postpaid service revenues
Postpaid phone revenues$9,341  $5,287  $14,918  $10,470  
Postpaid other revenues618  326  928  636  
Total postpaid service revenues$9,959  $5,613  $15,846  $11,106  
Equipment revenues from the lease of mobile communication devices were as follows:
Three Months Ended June 30,Six Months Ended June 30,
(in millions)2020201920202019
Equipment revenues from the lease of mobile communication devices$1,421  $143  $1,586  $304  
Schedule of Contract Liability and Receivable Balances
The opening and closing balances of our contract asset and contract liability balances from contracts with customers as of December 31, 2019 and June 30, 2020, were as follows:
(in millions)Contract AssetsContract Liabilities
Balance as of December 31, 2019$63  $560  
Balance as of June 30, 2020197  845  
Change$134  $285  
Revenues for the three and six months ended June 30, 2020 and 2019, include the following:
Three Months Ended June 30,Six Months Ended June 30,
(in millions)2020201920202019
Amounts included in the beginning of year contract liability balance$10  $43  $538  $603