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Intangible Assets (Tables)
 6 Months Ended
Sep. 30, 2017
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,
2017
 
Net
Additions (Reductions)
 
September 30,
2017
 
(in millions)
FCC licenses
$
36,550

 
$
487

(1) 
$
37,037

Trademarks
4,035

 
—

 
4,035

Goodwill
6,579

 
(1
)
 
6,578

 
$
47,164

 
$
486

 
$
47,650


_________________
(1)
Net additions within FCC licenses include a $479 million increase from spectrum license exchanges described below during the six-month period ended September 30, 2017.
Intangible Assets Subject to Amortization
 
 
 
September 30, 2017
 
March 31, 2017
 
Useful Lives
 
Gross
Carrying
Value
 
Accumulated
Amortization
 
Net
Carrying
Value
 
Gross
Carrying
Value
 
Accumulated
Amortization
 
Net
Carrying
Value
 
 
 
(in millions)
Customer relationships
8 years
 
$
6,561

 
$
(5,103
)
 
$
1,458

 
$
6,923

 
$
(5,053
)
 
$
1,870

Other intangible assets:
 
 
 
 
 
 
 
 
 
 
 
 
Favorable spectrum leases
23 years
 
861

 
(154
)
 
707

 
869

 
(138
)
 
731

Favorable tower leases
7 years
 
589

 
(414
)
 
175

 
589

 
(386
)
 
203

Trademarks
34 years
 
520

 
(66
)
 
454

 
520

 
(58
)
 
462

Other
10 years
 
96

 
(42
)
 
54

 
91

 
(37
)
 
54

Total other intangible assets
 
2,066


(676
)

1,390


2,069


(619
)

1,450

Total definite-lived intangible assets
 
$
8,627


$
(5,779
)

$
2,848


$
8,992


$
(5,672
)

$
3,320