Intangible Assets (Intangible Assets Subject to Amortization) (Details) (USD $) In Millions, unless otherwise specified		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2013 Customer Relationships [Member]	Sep. 30, 2013 Minimum [Member] Trademarks [Member]	Sep. 30, 2013 Minimum [Member] Reacquired Rights [Member]	Sep. 30, 2013 Minimum [Member] Other Finite Lived Intangible Assets [Member]	Sep. 30, 2013 Maximum [Member] Trademarks [Member]	Sep. 30, 2013 Maximum [Member] Reacquired Rights [Member]	Sep. 30, 2013 Maximum [Member] Other Finite Lived Intangible Assets [Member]	Sep. 30, 2013 Successor [Member]	Dec. 31, 2012 Successor [Member]	Sep. 30, 2013 Successor [Member] Customer Relationships [Member]	Sep. 30, 2013 Successor [Member] Favorable spectrum leases [Member]	Sep. 30, 2013 Successor [Member] Favorable tower leases [Member]	Sep. 30, 2013 Successor [Member] Trademarks [Member]	Sep. 30, 2013 Successor [Member] Reacquired Rights [Member]	Sep. 30, 2013 Successor [Member] Other Finite Lived Intangible Assets [Member]	Sep. 30, 2013 Successor [Member] Finite Lived Intangible Assets Excluding Customer Relationships [Member]	Dec. 31, 2012 Predecessor [Member]	Dec. 31, 2012 Predecessor [Member] Customer Relationships [Member]	Dec. 31, 2012 Predecessor [Member] Favorable spectrum leases [Member]	Dec. 31, 2012 Predecessor [Member] Favorable tower leases [Member]	Dec. 31, 2012 Predecessor [Member] Trademarks [Member]	Dec. 31, 2012 Predecessor [Member] Reacquired Rights [Member]	Dec. 31, 2012 Predecessor [Member] Other Finite Lived Intangible Assets [Member]	Dec. 31, 2012 Predecessor [Member] Finite Lived Intangible Assets Excluding Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Amortization Expense, Remainder of Fiscal Year	$ 473
Finite-Lived Intangible Asset, Useful Life		4 years		9 years	4 years	34 years	14 years	10 years
Gross Carrying Value									8,970		6,923	884	589	520	0	54	2,047	3,111	234	0	0	1,168	1,571	138	2,877
Accumulated Amortization									(487)		(445)	(10)	(26)	(4)	0	(2)	(42)	(1,776)	(230)	0	0	(681)	(785)	(80)	(1,546)
Net Carrying Value									8,483	0	6,478			516	0	52	2,005	1,335	4	0	0	487	786	58	1,331
Finite-Lived Intangible Asset, Off-market Lease, Favorable, Gross												874	563
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months	1,737
Finite-Lived Intangible Assets, Amortization Expense, Year Two	1,488
Finite-Lived Intangible Assets, Amortization Expense, Year Three	1,231
Finite-Lived Intangible Assets, Amortization Expense, Year Four	$ 946