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Intangible Assets (Tables)
 9 Months Ended
Dec. 31, 2018
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,
2018
 
Net
Additions
 
December 31,
2018
 
(in millions)
FCC licenses
$
37,274

 
$
139

 
$
37,413

Trademarks
4,035

 
—

 
4,035

Goodwill(1)
6,586

 
12

 
6,598

 
$
47,895

 
$
151

 
$
48,046


_________________
(1)
Through December 31, 2018, there is no accumulated impairment losses for goodwill.
Intangible Assets Subject to Amortization
 
 
 
December 31, 2018
 
March 31, 2018
 
Useful Lives
 
Gross
Carrying
Value
 
Accumulated
Amortization
 
Net
Carrying
Value
 
Gross
Carrying
Value
 
Accumulated
Amortization
 
Net
Carrying
Value
 
 
 
(in millions)
Customer relationships
5 to 8 years
 
$
6,563

 
$
(5,906
)
 
$
657

 
$
6,562

 
$
(5,462
)
 
$
1,100

Other intangible assets:
 
 
 
 
 
 
 
 
 
 
 
 
Favorable spectrum leases
23 years
 
764

 
(142
)
 
622

 
856

 
(172
)
 
684

Favorable tower leases
9 years
 
335

 
(207
)
 
128

 
335

 
(179
)
 
156

Trademarks
2 to 34 years
 
520

 
(86
)
 
434

 
520

 
(74
)
 
446

Other
5 to 10 years
 
135

 
(61
)
 
74

 
129

 
(50
)
 
79

Total other intangible assets
 
1,754


(496
)

1,258


1,840


(475
)

1,365

Total definite-lived intangible assets
 
$
8,317


$
(6,402
)

$
1,915


$
8,402


$
(5,937
)

$
2,465