Revenue from Contracts with Customers (Tables)

12 Months Ended

Mar. 31, 2019

Revenue from Contract with Customer [Abstract]

Disaggregation of Revenue [Table Text Block]

The following table presents disaggregated reported revenue by category:

	Year Ended
	March 31, 2019
	(in millions)
Service revenue
Postpaid	$	16,910
Prepaid	3,746
Wholesale, affiliate and other	1,177
Wireline	1,024
Total service revenue	22,857
Equipment sales	5,606
Equipment rentals	5,137
Total revenue	$	33,600

Contract with Customer, Asset and Liability [Table Text Block]

The following table presents the opening and closing balances of our contract assets, contract liabilities, and receivables balances, as well as capitalized costs associated with contracts with customers:

	March 31,			April 1,
	2019			2018
	(in millions)
Contract assets and liabilities
Contract assets(1)	$	928		$	432
Billed trade receivables	2,690			2,559
Unbilled trade receivables	945			1,250
Contract liabilities(2)	1,009			1,104
Other related assets
Capitalized costs to acquire a customer contract:
Sales commissions - opening balance	$	1,219
Sales commissions - additions	1,147
Amortization of capitalized sales commissions	(807		)
Net costs to acquire acustomer contract	$	1,559

Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table Text Block]

The aggregate amount of total transaction price allocated to performance obligations in contracts existing as of the balance sheet date, which are wholly or partially unsatisfied as of the end of the reporting period, and the expected time frame for satisfaction of those wholly or partially unsatisfied performance obligations, are as follows (in millions):

Year ending March 31, 2020	$	8,116
Year ending March 31, 2021	1,052
Total	$	9,168