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Intangible Assets (Tables)
 9 Months Ended
Dec. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]  
Indefinite-Lived Intangible Assets
The following provides the activity of indefinite-lived intangible assets within the consolidated balance sheets:
 
March 31,
2016
 
Net
Additions
 
December 31,
2016
 
(in millions)
FCC licenses (1)
$
36,038

 
$
483

 
$
36,521

Trademarks
4,035

 
—

 
4,035

Goodwill
6,575

 
4

 
6,579

 
$
46,648

 
$
487

 
$
47,135


_________________
(1)
Net additions within FCC licenses includes $85 million of spectrum acquired from the Shentel transaction (see Note 8. Long-Term Debt, Financing and Capital Lease Obligations) and an increase from spectrum license exchanges described below during the nine-month period ended December 31, 2016.
Intangible Assets Subject to Amortization
 
 
 
December 31, 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

 
$
(4,824
)
 
$
2,099

 
$
6,923

 
$
(4,045
)
 
$
2,878

Other intangible assets:
 
 
 
 
 
 
 
 
 
 
 
 
Favorable spectrum leases
23 years
 
870

 
(129
)
 
741

 
881

 
(110
)
 
771

Favorable tower leases
3 to 7 years
 
589

 
(367
)
 
222

 
589

 
(302
)
 
287

Trademarks
34 years
 
520

 
(55
)
 
465

 
520

 
(43
)
 
477

Other
4 to 10 years
 
90

 
(35
)
 
55

 
83

 
(27
)
 
56

Total other intangible assets
 
2,069


(586
)

1,483


2,073


(482
)

1,591

Total definite-lived intangible assets
 
$
8,992


$
(5,410
)

$
3,582


$
8,996


$
(4,527
)

$
4,469