Severance and Exit Costs (Schedule of Severance and Exit Costs) (Details) - USD ($) $ in Millions		3 Months Ended
		Jun. 30, 2015	Jun. 30, 2014	Mar. 31, 2015
Restructuring Reserve [Roll Forward]
Restructuring Reserve		$ 338		$ 454
Supplemental Unemployment Benefits, Severance Benefits		70		119
Restructuring Charges		(7)	$ 27
Severance Costs	[1]	7
Payments for Postemployment Benefits		(56)
Restructuring Reserve, Settled with Cash		(109)
Lease [Member]
Restructuring Reserve [Roll Forward]
Restructuring Reserve		241		291
Restructuring Charges	[2]	(15)
Restructuring reserved settled with cash and other adjustments		(35)
Access [Member]
Restructuring Reserve [Roll Forward]
Restructuring Reserve		27		$ 44
Restructuring Charges	[3]	1
Restructuring reserved settled with cash and other adjustments		(18)
Wireless [Member] | Lease [Member]
Restructuring Reserve [Roll Forward]
Restructuring Charges	[3]	5
Other Operating Income (Expense) [Member]
Restructuring Reserve [Roll Forward]
Severance Costs	[1]	7
Other Operating Income (Expense) [Member] | Wireless [Member]
Restructuring Reserve [Roll Forward]
Severance Costs	[1]	6
Restructuring Reserve, Accrual Adjustment		20
Other Operating Income (Expense) [Member] | Wireless [Member] | Access [Member]
Restructuring Reserve [Roll Forward]
Restructuring Charges	[3]	1
Other Operating Income (Expense) [Member] | Wireline [Member]
Restructuring Reserve [Roll Forward]
Severance Costs	[1]	$ 1

[1] For the three-month period ended June 30, 2015, we recognized costs of $7 million ($6 million Wireless, $1 million Wireline) included in "Other, net" on the consolidated statements of comprehensive (loss) income.

[2] In addition to the $20 million income (Wireless only) related to U.S. Cellular, we recognized costs of $5 million (Wireless only) for the three-month period ended June 30, 2015 included in "Other, net" on the consolidated statements of comprehensive (loss) income.

[3] For the three-month period ended June 30, 2015, we recognized costs of $1 million (Wireless only) included in "Other, net" on the consolidated statements of comprehensive (loss) income.