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Intangible Assets (Tables)
 3 Months Ended
Jun. 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)
 
June 30,
2017
 
(in millions)
FCC licenses
$
36,550

 
$
489

(1) 
$
37,039

Trademarks
4,035

 
—

 
4,035

Goodwill
6,579

 
(1
)
 
6,578

 
$
47,164

 
$
488

 
$
47,652


_________________
(1)
Net additions within FCC licenses include a $479 million increase from spectrum license exchanges described below during the three-month period ended June 30, 2017.
Intangible Assets Subject to Amortization
 
 
 
June 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
4 to 8 years
 
$
6,923

 
$
(5,266
)
 
$
1,657

 
$
6,923

 
$
(5,053
)
 
$
1,870

Other intangible assets:
 
 
 
 
 
 
 
 
 
 
 
 
Favorable spectrum leases
23 years
 
868

 
(147
)
 
721

 
869

 
(138
)
 
731

Favorable tower leases
7 years
 
589

 
(405
)
 
184

 
589

 
(386
)
 
203

Trademarks
34 years
 
520

 
(62
)
 
458

 
520

 
(58
)
 
462

Other
10 years
 
94

 
(39
)
 
55

 
91

 
(37
)
 
54

Total other intangible assets
 
2,071


(653
)

1,418


2,069


(619
)

1,450

Total definite-lived intangible assets
 
$
8,994


$
(5,919
)

$
3,075


$
8,992


$
(5,672
)

$
3,320