CONSOLIDATED STATEMENTS OF COMPREHENSIVE (LOSS) INCOME - USD ($) shares in Millions, $ in Millions	3 Months Ended			9 Months Ended
	Dec. 31, 2015	Dec. 31, 2014		Dec. 31, 2015	Dec. 31, 2014
Revenue, Net [Abstract]
Service	$ 6,683	$ 7,272		$ 20,600	$ 22,404
Equipment	1,424	1,701		3,509	3,846
Net operating revenues	8,107	8,973		24,109	26,250
Net operating expenses
Cost of Services (exclusive of depreciation and amortization included below)	2,348	2,330		7,194	7,279
Cost of Products (exclusive of depreciation and amortization included below)	1,589	2,952		4,244	7,482
Selling, general and administrative	2,129	2,647		6,540	7,232
Impairments	0	2,133	[1]	0	2,133	[1]
Severance and exit costs	209	22		247	333
Depreciation	1,549	940		4,202	2,706
Amortization	316	380		994	1,189
Other, net	164	109		386	109
Total costs and expenses	8,304	11,513		23,807	28,463
Operating Income	(197)	(2,540)		302	(2,213)
Other (expense) income
Interest Expense	(546)	(506)		(1,630)	(1,528)
Other income, net	4	10		13	19
Nonoperating Expense	(542)	(496)		(1,617)	(1,509)
Loss (income) before income taxes	(739)	(3,036)		(1,315)	(3,722)
Income tax benefit	(97)	657		(126)	601
Net (loss) income	$ (836)	$ (2,379)		$ (1,441)	$ (3,121)
Basic net (loss) income per common share	$ (0.21)	$ (0.60)		$ (0.36)	$ (0.79)
Diluted net (loss) income per common share	$ (0.21)	$ (0.60)		$ (0.36)	$ (0.79)
Basic weighted average common shares outstanding	3,970	3,957		3,969	3,950
Diluted weighted average common shares outstanding	3,970	3,957		3,969	3,950
Other comprehensive (loss) income, net of tax:
Net unrealized holding gains on securities and other	$ (9)	$ (12)		$ (16)	$ (18)
Net unrecognized net periodic pension and other postretirement benefits	2	(208)		5	(209)
Other comprehensive income	(7)	(220)		(11)	(227)
Comprehensive (loss) income	$ (843)	$ (2,599)		$ (1,452)	$ (3,348)

[1] Impairments for the three and nine-month periods ended December 31, 2014 consist of a $1.9 billion Sprint trade name impairment related to the Wireless segment and a $233 million impairment related to Wireline long-lived assets.