CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016
Net operating revenues:
Service	$ 23,834	$ 25,368	$ 27,174
Revenue, equipment sales, net	4,524	4,684	3,168
Revenue, equipment rentals, net	4,048	3,295	1,838
Inter-segment revenues	32,406	33,347	32,180
Net operating expenses:
Cost of services (exclusive of depreciation and amortization below)	6,801	7,861	9,439
Cost of equipment rentals	493	975	598
Cost of equipment sales	6,109	6,583	5,518
Selling, general and administrative	8,087	7,994	8,479
Severance and exit costs	80	66	409
Depreciation, equipment rentals	3,792	3,116	1,781
Depreciation, network and other	3,976	3,982	4,013
Amortization	812	1,052	1,294
Other Operating Income (Expense), Net	(471)	(46)	339
Total costs and expenses	29,679	31,583	31,870
Operating (loss) income	2,727	1,764	310
Other (expense) income:
Interest expense	(2,365)	(2,495)	(2,182)
Other income (expense), net	(59)	(40)	18
Nonoperating income (expense)	(2,424)	(2,535)	(2,164)
Income (loss) before income taxes	303	(771)	(1,854)
Income tax benefit (expense)	7,074	(435)	(141)
Net loss	7,389	(1,206)	(1,995)
Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest	7,377	(1,206)	(1,995)
Net Income (Loss) Attributable to Noncontrolling Interest	$ 12	$ 0	$ 0
Earnings Per Share, Basic	$ 1.85	$ (0.30)	$ (0.50)
Earnings Per Share, Diluted	$ 1.81	$ (0.30)	$ (0.50)
Weighted Average Number of Shares Outstanding, Basic	3,999	3,981	3,969
Weighted Average Number of Shares Outstanding, Diluted	4,078	3,981	3,969