Severance, Exit Costs and Asset Impairments Severance, Exit Costs and Asset Impairments (Schedule of Severance and Exit Costs Liability) (Details) (Successor [Member], USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Sep. 30, 2014		Sep. 30, 2014		Mar. 31, 2014
Restructuring Reserve [Roll Forward]
Restructuring Reserve	$ 825		$ 825		$ 971
Supplemental Unemployment Benefits, Severance Benefits	289		289		197
Restructuring Charges			311
Severance Costs	263		269	[1]
Payments for Postemployment Benefits			(177)
Restructuring Reserve, Settled with Cash			(457)
Lease [Member]
Restructuring Reserve [Roll Forward]
Restructuring Reserve	443		443		650
Restructuring reserved settled with cash and other adjustments			(220)
Access [Member]
Restructuring Reserve [Roll Forward]
Restructuring Reserve	93		93		124
Restructuring Charges	11		29	[2]
Restructuring reserved settled with cash and other adjustments			(60)
Wireline [Member]
Restructuring Reserve [Roll Forward]
Severance Costs	35	[1]	36
Wireline [Member] | Access [Member]
Restructuring Reserve [Roll Forward]
Restructuring Charges	2		5
Wireless [Member]
Restructuring Reserve [Roll Forward]
Severance Costs	228	[1]	233
Wireless [Member] | Lease [Member]
Restructuring Reserve [Roll Forward]
Restructuring Charges	10		13	[3]
Wireless [Member] | Access [Member]
Restructuring Reserve [Roll Forward]
Restructuring Charges	$ 9	[3]	$ 24	[3]

[1] For the Successor three and six-month periods ended September 30, 2014, we recognized costs of $263 million ($228 million Wireless, $35 million Wireline) and $269 million ($233 million Wireless, $36 million Wireline), respectively.

[2] For the Successor three and six-month periods ended September 30, 2014, we recognized costs of $11 million ($9 million Wireless, $2 million Wireline) and $29 million ($24 million Wireless, $5 million Wireline), respectively.

[3] For the Successor three and six-month periods ended September 30, 2014, we recognized costs of $10 million and $13 million ( Wireless only).