CONSOLIDATED STATEMENTS OF COMPREHENSIVE (LOSS) INCOME - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Revenue, Net [Abstract]
Service	$ 6,880	$ 7,449	$ 13,917	$ 15,132
Equipment	1,095	1,039	2,085	2,145
Net operating revenues	7,975	8,488	16,002	17,277
Net operating expenses
Cost of Services (exclusive of depreciation and amortization included below)	2,453	2,429	4,846	4,949
Cost of Products (exclusive of depreciation and amortization included below)	1,290	2,372	2,655	4,530
Selling, general and administrative	2,224	2,301	4,411	4,585
Impairments	85	0	85	0
Severance and exit costs	25	284	38	311
Depreciation	1,412	898	2,653	1,766
Amortization	331	396	678	809
Other, net	157	0	137	0
Total costs and expenses	7,977	8,680	15,503	16,950
Operating Income	(2)	(192)	499	327
Other (expense) income
Interest Expense	(542)	(510)	(1,084)	(1,022)
Other income, net	5	8	9	9
Nonoperating Expense	(537)	(502)	(1,075)	(1,013)
Loss (income) before income taxes	(539)	(694)	(576)	(686)
Income tax benefit	(46)	(71)	(29)	(56)
Net (loss) income	$ (585)	$ (765)	$ (605)	$ (742)
Basic net (loss) income per common share	$ (0.15)	$ (0.19)	$ (0.15)	$ (0.19)
Diluted net (loss) income per common share	$ (0.15)	$ (0.19)	$ (0.15)	$ (0.19)
Basic weighted average common shares outstanding	3,969	3,949	3,968	3,947
Diluted weighted average common shares outstanding	3,969	3,949	3,968	3,947
Other comprehensive (loss) income, net of tax:
Net unrealized holding gains on securities and other	$ (9)	$ (6)	$ (7)	$ (6)
Net unrecognized net periodic pension and other postretirement benefits	1	(1)	3	(1)
Other comprehensive income	(8)	(7)	(4)	(7)
Comprehensive (loss) income	$ (593)	$ (772)	$ (609)	$ (749)