CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016
Cash flows from operating activities:
Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest	$ 7,377	$ (1,206)	$ (1,995)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Depreciation and amortization	8,580	8,150	7,088
Provision for losses on accounts receivable	362	555	455
Share-based and long-term incentive compensation expense	182	93	75
Deferred income tax (benefit) expense	(7,119)	433	123
Gains from asset dispositions and exchanges	479	354	0
Loss on early extinguishment of debt	65	0	0
Amortization and accretion of long-term debt premiums and discounts	(158)	(302)	(316)
Loss on disposal of property, plant and equipment	868	509	487
Litigation and other contingencies	(13)	140	193
Contract terminations	(5)	111	0
Deferred purchase price from sale of receivables	(1,140)	(10,498)	(7,925)
Other changes in assets and liabilities:
Accounts and notes receivable	83	(1,017)	583
Inventories and other current assets	705	457	605
Accounts payable and other current liabilities	57	(365)	(590)
Non-current assets and liabilities, net	271	(308)	295
Other, net	426	312	499
Net cash provided by (used in) operating activities	10,062	(3,290)	(423)
Cash flows from investing activities:
Capital expenditures - network and other	(3,319)	(1,950)	(4,680)
Capital expenditures - leased devices	(7,461)	(4,976)	(5,898)
Expenditures relating to FCC licenses	(115)	(83)	(98)
Proceeds from sales and maturities of short-term investments	7,202	4,621	418
Purchases of short-term investments	(4,112)	(10,065)	(252)
Proceeds from sale of assets and FCC licenses	527	219	62
Proceeds from Sale and Collection of Receivables	1,140	10,498	7,925
Proceeds from sale-leaseback transaction	0	0	1,136
Other, net	3	41	(28)
Net cash used in investing activities	(6,135)	(1,695)	(1,415)
Cash flows from financing activities:
Proceeds from debt and financings	8,529	10,966	1,355
Repayments of debt, financing and capital lease obligations	(8,518)	(5,417)	(899)
Debt financing costs	(93)	(358)	(11)
Call premiums paid on debt redemptions	131	0	0
Other, net	3	95	24
Net cash provided by (used in) financing activities	(210)	5,286	469
Net increase (decrease) in cash, cash equivalents and restricted cash	3,717	301	(1,369)
Cash, cash equivalents and restricted cash, beginning of period	2,942	2,641	4,010
Cash, cash equivalents and restricted cash, end of period	$ 6,659	$ 2,942	$ 2,641