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Intangible Assets (Tables)
 3 Months Ended
Jun. 30, 2014
Goodwill and Intangible Assets Disclosure [Abstract]  
Indefinite-Lived Intangible Assets
 
Successor
 
March 31,
2014
 
Net
Reductions
 
June 30,
2014
 
(in millions)
FCC licenses
$
36,043

 
$
(214
)
 
$
35,829

Trademarks
5,935

 
—

 
5,935

Goodwill
6,383

 
(40
)
(1 
) 
6,343

 
$
48,361

 
$
(254
)
 
$
48,107
Intangible Assets Subject to Amortization
 
 
 
Successor
 
 
 
June 30, 2014
 
March 31, 2014
 
Useful Lives
 
Gross
Carrying
Value
 
Accumulated
Amortization
 
Net
Carrying
Value
 
Gross
Carrying
Value
 
Accumulated
Amortization
 
Net
Carrying
Value
 
 
 
(in millions)
Customer relationships
4 to 8 years
 
$
6,923

 
$
(1,687
)
 
$
5,236

 
$
6,923

 
$
(1,289
)
 
$
5,634

Other intangible assets:
 
 
 
 
 
 
 
 
 
 
 
 
Favorable spectrum leases
23 years
 
884

 
(40
)
 
844

 
884

 
(30
)
 
854

Favorable tower leases
3 to 7 years
 
589

 
(107
)
 
482

 
589

 
(80
)
 
509

Trademarks
34 years
 
520

 
(16
)
 
504

 
520

 
(12
)
 
508

Other
4 to 10 years
 
63

 
(10
)
 
53

 
60

 
(7
)
 
53

Total other intangible assets
 
2,056


(173
)

1,883


2,053


(129
)

1,924

Total definite-lived intangible assets
 
$
8,979


$
(1,860
)

$
7,119


$
8,976


$
(1,418
)

$
7,558