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Intangible Assets (Tables)
 6 Months Ended
Sep. 30, 2016
Goodwill and Intangible Assets Disclosure [Abstract]  
Indefinite-Lived Intangible Assets
 
March 31,
2016
 
Net
Additions
 
September 30,
2016
 
(in millions)
FCC licenses (1)
$
36,038

 
$
468

 
$
36,506

Trademarks
4,035

 
—

 
4,035

Goodwill
6,575

 
—

 
6,575

 
$
46,648

 
$
468

 
$
47,116
Intangible Assets Subject to Amortization
 
 
 
September 30, 2016
 
March 31, 2016
 
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

 
$
(4,580
)
 
$
2,343

 
$
6,923

 
$
(4,045
)
 
$
2,878

Other intangible assets:
 
 
 
 
 
 
 
 
 
 
 
 
Favorable spectrum leases
23 years
 
880

 
(129
)
 
751

 
881

 
(110
)
 
771

Favorable tower leases
3 to 7 years
 
589

 
(348
)
 
241

 
589

 
(302
)
 
287

Trademarks
34 years
 
520

 
(50
)
 
470

 
520

 
(43
)
 
477

Other
4 to 10 years
 
88

 
(32
)
 
56

 
83

 
(27
)
 
56

Total other intangible assets
 
2,077


(559
)

1,518


2,073


(482
)

1,591

Total definite-lived intangible assets
 
$
9,000


$
(5,139
)

$
3,861


$
8,996


$
(4,527
)

$
4,469