Property, Plant and Equipment (Tables)

9 Months Ended

Dec. 31, 2017

Property, Plant and Equipment [Line Items]

Schedule of Property, Plant and Equipment

The following table presents the components of property, plant and equipment and the related accumulated depreciation:

	December 31, 2017			March 31, 2017
	(in millions)
Land	$	254		$	260
Network equipment, site costs and related software	22,649			21,693
Buildings and improvements	809			818
Non-network internal use software, office equipment, leased devices and other	10,626			8,625
Construction in progress	2,101			2,316
Less: accumulated depreciation	(16,727		)	(14,503		)
Property, plant and equipment, net	$	19,712		$	19,209

Leased devices [Member]

Property, Plant and Equipment [Line Items]

Schedule of Property, Plant and Equipment

The following table presents leased devices and the related accumulated depreciation:

	December 31, 2017			March 31, 2017
	(in millions)
Leased devices	$	9,098		$	7,276
Less: accumulated depreciation	(3,415		)	(3,114		)
Leased devices, net	$	5,683		$	4,162