CONSOLIDATED STATEMENTS OF COMPREHENSIVE (LOSS) INCOME - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Revenue, Net [Abstract]
Service	$ 6,071	$ 6,516
Equipment	2,086	1,496
Net operating revenues	8,157	8,012
Net operating expenses
Cost of Services (exclusive of depreciation and amortization included below)	1,709	2,099
Cost of Products (exclusive of depreciation and amortization included below)	1,545	1,419
Selling, general and administrative	1,938	1,917
Severance and exit costs	0	16
Depreciation	1,831	1,680
Amortization	223	287
Other, net	(252)	233
Total costs and expenses	6,994	7,651
Operating Income	1,163	361
Other (expense) income
Interest Expense	(613)	(615)
Other income, net	(52)	8
Nonoperating Expense	(665)	(607)
Loss (income) before income taxes	498	(246)
Income tax benefit	(292)	(56)
Net (loss) income	$ 206	$ (302)
Basic net (loss) income per common share	$ 0.05	$ (0.08)
Diluted net (loss) income per common share	$ 0.05	$ (0.08)
Basic weighted average common shares outstanding	3,993	3,975
Diluted weighted average common shares outstanding	4,076	3,975
Other comprehensive (loss) income, net of tax:
Net unrealized holding gains on securities and other	$ 5	$ (2)
Net unrealized holding losses on derivatives	(9)	0
Net unrecognized net periodic pension and other postretirement benefits	0	1
Other comprehensive income	(4)	(1)
Comprehensive (loss) income	$ 202	$ (303)