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Intangible Assets (Tables)
 9 Months Ended
Dec. 31, 2019
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,
2019
 
Net
Additions
 
December 31,
2019
 
(in millions)
FCC licenses
$
37,430

 
$
27

 
$
37,457

Trademarks
4,035

 
—

 
4,035

Goodwill(1)
4,598

 
—

 
4,598

 
$
46,063

 
$
27

 
$
46,090


_________________
(1)
Through March 31, 2019 accumulated impairment losses for goodwill were $2.0 billion. There were no additional accumulated impairment losses for the nine-month period ended December 31, 2019.
Intangible Assets Subject to Amortization
 
 
 
December 31, 2019
 
March 31, 2019
 
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

 
$
(6,321
)
 
$
242

 
$
6,563

 
$
(6,029
)
 
$
534

Other intangible assets:
 
 
 
 
 
 
 
 
 
 
 
 
Favorable spectrum leases
23 years
 
802

 
(215
)
 
587

 
763

 
(150
)
 
613

Favorable tower leases(1)
—
 
—

 
—

 
—

 
335

 
(215
)
 
120

Trademarks
< 1 year
 
520

 
(482
)
 
38

 
520

 
(89
)
 
431

Other(2)
10 years
 
117

 
(66
)
 
51

 
137

 
(66
)
 
71

Total other intangible assets
 
1,439


(763
)

676


1,755


(520
)

1,235

Total definite-lived intangible assets
 
$
8,002


$
(7,084
)

$
918


$
8,318


$
(6,549
)

$
1,769