Revenue from Contracts with Customers (Tables)

12 Months Ended

Dec. 31, 2019

Revenue from Contract with Customer [Abstract]

Schedule of Disaggregation of Revenue

Branded postpaid service revenues, including branded postpaid phone revenues and branded postpaid other revenues, were as follows:

	Year Ended December 31,
(in millions)	2019		2018		2017
Branded postpaid service revenues
Branded postpaid phone revenues	$	21,329	$	19,745	$	18,371
Branded postpaid other revenues	1,344		1,117		1,077
Total branded postpaid service revenues	$	22,673	$	20,862	$	19,448

Equipment revenues from the lease of mobile communication devices were as follows:

	Year Ended December 31,
(in millions)	2019		2018		2017
Equipment revenues from the lease of mobile communication devices	$	599	$	692	$	877

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, 2018 and December 31, 2019, were as follows:

(in millions)	Contract Assets		Contract Liabilities
Balance as of December 31, 2018	$	51	$	645
Balance as of December 31, 2019	63		560
Change	$	12	$	(85)

Revenues for the years ended December 31, 2019 and 2018, include the following:

	Year Ended December 31,
(in millions)	2019		2018
Amounts included in the beginning of year contract liability balance	$	643	$	710