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

 
$
(178
)
 
$
35,865

Trademarks
5,935

 
—

 
5,935

Goodwill
6,383

 
(40
)
(1 
) 
6,343

 
$
48,361

 
$
(218
)
 
$
48,143
Intangible Assets Subject to Amortization
 
 
 
Successor
 
 
 
September 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

 
$
(2,071
)
 
$
4,852

 
$
6,923

 
$
(1,289
)
 
$
5,634

Other intangible assets:
 
 
 
 
 
 
 
 
 
 
 
 
Favorable spectrum leases
23 years
 
884

 
(51
)
 
833

 
884

 
(30
)
 
854

Favorable tower leases
3 to 7 years
 
589

 
(134
)
 
455

 
589

 
(80
)
 
509

Trademarks
34 years
 
520

 
(19
)
 
501

 
520

 
(12
)
 
508

Other
4 to 10 years
 
67

 
(12
)
 
55

 
60

 
(7
)
 
53

Total other intangible assets
 
2,060


(216
)

1,844


2,053


(129
)

1,924

Total definite-lived intangible assets
 
$
8,983


$
(2,287
)

$
6,696


$
8,976


$
(1,418
)

$
7,558