Segments (Operating Revenues by Service and Products) (Details) (USD $)	3 Months Ended												6 Months Ended		12 Months Ended				0 Months Ended	12 Months Ended
	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014		Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013		Dec. 31, 2012	Jul. 10, 2013		Mar. 31, 2015		Dec. 31, 2013		Jul. 10, 2013	Dec. 31, 2012
Successor [Member]
Segment Reporting Information [Line Items]
Inter-segment revenues	$ 8,292,000,000	$ 8,973,000,000	$ 8,488,000,000	$ 8,789,000,000	$ 8,875,000,000		$ 9,142,000,000	$ 7,749,000,000	$ 0	$ 0		$ 0			$ 34,532,000,000		$ 16,891,000,000
Net operating revenues					8,875,000,000					0		0	16,891,000,000		34,532,000,000		16,891,000,000
Successor [Member] | Services [Member]
Segment Reporting Information [Line Items]
Net operating revenues					7,096,000,000										26,544,000,000		13,579,000,000
Successor [Member] | Equipment [Member]
Segment Reporting Information [Line Items]
Net operating revenues					999,000,000								1,797,000,000		4,990,000,000
Successor [Member] | Voice [Member]
Segment Reporting Information [Line Items]
Net operating revenues					264,000,000								479,000,000		809,000,000
Successor [Member] | Data [Member]
Segment Reporting Information [Line Items]
Net operating revenues					36,000,000								69,000,000		125,000,000
Successor [Member] | Internet [Member]
Segment Reporting Information [Line Items]
Net operating revenues					308,000,000								666,000,000		1,188,000,000
Successor [Member] | Other Products or Services [Member]
Segment Reporting Information [Line Items]
Net operating revenues					172,000,000								301,000,000		876,000,000
Successor [Member] | Wireless [Member]
Segment Reporting Information [Line Items]
Inter-segment revenues					8,254,000,000										32,327,000,000		15,642,000,000
Net operating revenues					8,254,000,000					0		0			32,327,000,000		15,642,000,000
Successor [Member] | Wireless [Member] | Services [Member]
Segment Reporting Information [Line Items]
Inter-segment revenues					7,096,000,000										26,544,000,000		13,579,000,000
Successor [Member] | Wireless [Member] | Equipment [Member]
Segment Reporting Information [Line Items]
Inter-segment revenues					999,000,000										4,990,000,000		1,797,000,000
Successor [Member] | Wireless [Member] | Voice [Member]
Segment Reporting Information [Line Items]
Inter-segment revenues					0										0		0
Successor [Member] | Wireless [Member] | Data [Member]
Segment Reporting Information [Line Items]
Inter-segment revenues					0										0		0
Successor [Member] | Wireless [Member] | Internet [Member]
Segment Reporting Information [Line Items]
Inter-segment revenues					0										0		0
Successor [Member] | Wireless [Member] | Other Products or Services [Member]
Segment Reporting Information [Line Items]
Inter-segment revenues					159,000,000										793,000,000		266,000,000
Successor [Member] | Wireline [Member]
Segment Reporting Information [Line Items]
Inter-segment revenues					770,000,000								1,636,000,000		2,814,000,000
Net operating revenues					617,000,000					0		0			2,191,000,000		1,240,000,000
Successor [Member] | Wireline [Member] | Services [Member]
Segment Reporting Information [Line Items]
Inter-segment revenues					0										0		0
Successor [Member] | Wireline [Member] | Equipment [Member]
Segment Reporting Information [Line Items]
Inter-segment revenues					0								0		0
Successor [Member] | Wireline [Member] | Voice [Member]
Segment Reporting Information [Line Items]
Inter-segment revenues					352,000,000								719,000,000		1,174,000,000
Successor [Member] | Wireline [Member] | Data [Member]
Segment Reporting Information [Line Items]
Inter-segment revenues					62,000,000								138,000,000		213,000,000
Successor [Member] | Wireline [Member] | Internet [Member]
Segment Reporting Information [Line Items]
Inter-segment revenues					345,000,000								747,000,000		1,353,000,000
Successor [Member] | Wireline [Member] | Other Products or Services [Member]
Segment Reporting Information [Line Items]
Inter-segment revenues					11,000,000								32,000,000		74,000,000
Successor [Member] | Corporate, Other And Eliminations [Member]
Segment Reporting Information [Line Items]
Inter-segment revenues					(149,000,000)	[1]							(387,000,000)	[1]	(609,000,000)	[1]
Net operating revenues					4,000,000					0		0			14,000,000		9,000,000
Successor [Member] | Corporate, Other And Eliminations [Member] | Services [Member]
Segment Reporting Information [Line Items]
Inter-segment revenues					0	[1]									0		0	[1]
Successor [Member] | Corporate, Other And Eliminations [Member] | Equipment [Member]
Segment Reporting Information [Line Items]
Inter-segment revenues					0	[1]							0	[1]	0
Successor [Member] | Corporate, Other And Eliminations [Member] | Voice [Member]
Segment Reporting Information [Line Items]
Inter-segment revenues					(88,000,000)	[1]							(240,000,000)	[1]	(365,000,000)
Successor [Member] | Corporate, Other And Eliminations [Member] | Data [Member]
Segment Reporting Information [Line Items]
Inter-segment revenues					(26,000,000)	[1]							(69,000,000)	[1]	(88,000,000)
Successor [Member] | Corporate, Other And Eliminations [Member] | Internet [Member]
Segment Reporting Information [Line Items]
Inter-segment revenues					(37,000,000)	[1]							(81,000,000)	[1]	(165,000,000)
Successor [Member] | Corporate, Other And Eliminations [Member] | Other Products or Services [Member]
Segment Reporting Information [Line Items]
Inter-segment revenues					2,000,000	[1]							3,000,000	[1]	9,000,000
Predecessor [Member]
Segment Reporting Information [Line Items]
Inter-segment revenues								8,877,000,000		8,793,000,000			18,602,000,000						932,000,000	35,345,000,000
Net operating revenues										8,793,000,000			18,602,000,000							35,366,000,000
Predecessor [Member] | Services [Member]
Segment Reporting Information [Line Items]
Net operating revenues										7,143,000,000			15,139,000,000							28,624,000,000	[2]
Predecessor [Member] | Equipment [Member]
Segment Reporting Information [Line Items]
Net operating revenues										813,000,000			1,707,000,000							3,248,000,000
Predecessor [Member] | Voice [Member]
Segment Reporting Information [Line Items]
Net operating revenues										253,000,000			535,000,000							1,112,000,000
Predecessor [Member] | Data [Member]
Segment Reporting Information [Line Items]
Net operating revenues										48,000,000			95,000,000							222,000,000
Predecessor [Member] | Internet [Member]
Segment Reporting Information [Line Items]
Net operating revenues										387,000,000			813,000,000							1,591,000,000
Predecessor [Member] | Other Products or Services [Member]
Segment Reporting Information [Line Items]
Net operating revenues										149,000,000			313,000,000							569,000,000
Predecessor [Member] | Wireless [Member]
Segment Reporting Information [Line Items]
Inter-segment revenues										8,089,000,000			17,125,000,000							32,355,000,000
Net operating revenues										8,089,000,000			17,125,000,000							32,355,000,000
Predecessor [Member] | Wireless [Member] | Services [Member]
Segment Reporting Information [Line Items]
Inter-segment revenues										7,143,000,000			15,139,000,000							28,624,000,000	[2]
Predecessor [Member] | Wireless [Member] | Equipment [Member]
Segment Reporting Information [Line Items]
Inter-segment revenues										813,000,000			1,707,000,000							3,248,000,000
Predecessor [Member] | Wireless [Member] | Voice [Member]
Segment Reporting Information [Line Items]
Inter-segment revenues										0			0							0
Predecessor [Member] | Wireless [Member] | Data [Member]
Segment Reporting Information [Line Items]
Inter-segment revenues										0			0							0
Predecessor [Member] | Wireless [Member] | Internet [Member]
Segment Reporting Information [Line Items]
Inter-segment revenues										0			0							0
Predecessor [Member] | Wireless [Member] | Other Products or Services [Member]
Segment Reporting Information [Line Items]
Inter-segment revenues										133,000,000			279,000,000							483,000,000
Predecessor [Member] | Wireline [Member]
Segment Reporting Information [Line Items]
Inter-segment revenues										893,000,000			1,901,000,000							3,881,000,000
Net operating revenues										702,000,000			1,471,000,000							2,999,000,000
Predecessor [Member] | Wireline [Member] | Services [Member]
Segment Reporting Information [Line Items]
Inter-segment revenues										0			0							0	[2]
Predecessor [Member] | Wireline [Member] | Equipment [Member]
Segment Reporting Information [Line Items]
Inter-segment revenues										0			0							0
Predecessor [Member] | Wireline [Member] | Voice [Member]
Segment Reporting Information [Line Items]
Inter-segment revenues										352,000,000			771,000,000							1,627,000,000
Predecessor [Member] | Wireline [Member] | Data [Member]
Segment Reporting Information [Line Items]
Inter-segment revenues										94,000,000			188,000,000							398,000,000
Predecessor [Member] | Wireline [Member] | Internet [Member]
Segment Reporting Information [Line Items]
Inter-segment revenues										434,000,000			913,000,000							1,781,000,000
Predecessor [Member] | Wireline [Member] | Other Products or Services [Member]
Segment Reporting Information [Line Items]
Inter-segment revenues										13,000,000			29,000,000							75,000,000
Predecessor [Member] | Corporate, Other And Eliminations [Member]
Segment Reporting Information [Line Items]
Inter-segment revenues										(189,000,000)	[1]		(424,000,000)	[1]						(870,000,000)	[1]
Net operating revenues										2,000,000			6,000,000							12,000,000
Predecessor [Member] | Corporate, Other And Eliminations [Member] | Services [Member]
Segment Reporting Information [Line Items]
Inter-segment revenues										0	[1]		0	[1]						0	[1],[2]
Predecessor [Member] | Corporate, Other And Eliminations [Member] | Equipment [Member]
Segment Reporting Information [Line Items]
Inter-segment revenues										0	[1]		0	[1]						0	[1]
Predecessor [Member] | Corporate, Other And Eliminations [Member] | Voice [Member]
Segment Reporting Information [Line Items]
Inter-segment revenues										(99,000,000)	[1]		(236,000,000)	[1]						(515,000,000)	[1]
Predecessor [Member] | Corporate, Other And Eliminations [Member] | Data [Member]
Segment Reporting Information [Line Items]
Inter-segment revenues										(46,000,000)	[1]		(93,000,000)	[1]						(176,000,000)	[1]
Predecessor [Member] | Corporate, Other And Eliminations [Member] | Internet [Member]
Segment Reporting Information [Line Items]
Inter-segment revenues										(47,000,000)	[1]		(100,000,000)	[1]						(190,000,000)	[1]
Predecessor [Member] | Corporate, Other And Eliminations [Member] | Other Products or Services [Member]
Segment Reporting Information [Line Items]
Inter-segment revenues										$ 3,000,000	[1]		$ 5,000,000	[1]						$ 11,000,000	[1]

[1] (1)Revenues eliminated in consolidation consist primarily of wireline services provided to the Wireless segment for resale to or use by wireless subscribers.

[2] (2)Wireless services related to the Wireless segment for the Predecessor year ended December 31, 2012 excludes $21 million of hurricane-related contra-revenue charges reflected in net operating revenues in our consolidated statements of operations.