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Intangible Assets (Tables)
 9 Months Ended
Dec. 31, 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
 
December 31,
2017
 
(in millions)
FCC licenses
$
36,550

 
$
637

(1) 
$
37,187

Trademarks
4,035

 
—

 
4,035

Goodwill
6,579

 
7

(2) 
6,586

 
$
47,164

 
$
644

 
$
47,808


_________________
(1)
During the nine-month period ended December 31, 2017, net additions within FCC licenses include a $479 million increase from spectrum license exchanges described below, and approximately $150 million of spectrum licenses as a result of the transaction with PRWireless PR, Inc.
Intangible Assets Subject to Amortization
 
 
 
December 31, 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

 
$
(5,289
)
 
$
1,272

 
$
6,923

 
$
(5,053
)
 
$
1,870

Other intangible assets:
 
 
 
 
 
 
 
 
 
 
 
 
Favorable spectrum leases
23 years
 
861

 
(163
)
 
698

 
869

 
(138
)
 
731

Favorable tower leases
7 years
 
487

 
(322
)
 
165

 
589

 
(386
)
 
203

Trademarks
34 years
 
520

 
(70
)
 
450

 
520

 
(58
)
 
462

Other
10 years
 
127

 
(45
)
 
82

 
91

 
(37
)
 
54

Total other intangible assets
 
1,995


(600
)

1,395


2,069


(619
)

1,450

Total definite-lived intangible assets
 
$
8,556


$
(5,889
)

$
2,667


$
8,992


$
(5,672
)

$
3,320