Severance, Exit Costs and Asset Impairments Severance, Exit Costs and Asset Impairments (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended		12 Months Ended			6 Months Ended		12 Months Ended								6 Months Ended		12 Months Ended		6 Months Ended		12 Months Ended
	Dec. 31, 2013	Dec. 30, 2012 Successor [Member]	Dec. 31, 2013 Successor [Member]		Dec. 31, 2013 Successor [Member]	Dec. 31, 2012 Successor [Member]	Dec. 31, 2011 Successor [Member]	Jul. 10, 2013 Predecessor [Member]		Dec. 31, 2012 Predecessor [Member]	Dec. 31, 2011 Predecessor [Member]		Dec. 31, 2013 Lease and access exit costs [Member] Minimum [Member]	Dec. 31, 2013 Lease and access exit costs [Member] Maximum [Member]	Dec. 31, 2012 Capitalized assets specific to the spectrum hosting [Member] Predecessor [Member]	Dec. 31, 2012 Network equipment, site costs and related software [Member] Predecessor [Member]	Dec. 31, 2012 Asset under Construction [Member] Successor [Member]	Dec. 31, 2013 Wireless [Member] Successor [Member]	Jul. 10, 2013 Wireless [Member] Predecessor [Member]	Dec. 31, 2011 Wireless [Member] Predecessor [Member]	Dec. 31, 2012 Wireless [Member] Network equipment, site costs and related software [Member] Predecessor [Member]	Dec. 31, 2013 Wireline [Member] Successor [Member]	Jul. 10, 2013 Wireline [Member] Predecessor [Member]	Dec. 31, 2011 Wireline [Member] Predecessor [Member]	Dec. 31, 2012 Wireline [Member] Network equipment, site costs and related software [Member] Predecessor [Member]
Restructuring Cost and Reserve [Line Items]
Severance Costs	$ 165		$ 219	[1]				$ 58	[2]	$ 0	$ 28	[3]						$ 191	$ 55	$ 25		$ 28	$ 3	$ 3
Restructuring And Related Cost Expected Future Cost													225	325
Asset impairments		$ 0			$ 0	$ 102	$ 78	$ 0		$ 102	$ 78				$ 66	$ 18	$ 18				$ 13				$ 5

[1] (9)For the year ended December 31, 2013, we recognized costs of $219 million ($191 million Wireless, $28 million Wireline).

[2] (2)For the 191-day period ended July 10, 2013, we recognized costs of $58 million ($55 million Wireless, and $3 million was Wireline).

[3] (6)For the year ended December 31, 2011, we recognized costs of $28 million ($25 million Wireless; $3 million Wireline).