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Intangible Assets (Tables)
 12 Months Ended
Mar. 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,
2018
 
Net
Additions (Impairments)
 
March 31,
2019
 
(in millions)
FCC licenses
$
37,274

 
$
156

 
$
37,430

Trademarks
4,035

 
—

 
4,035

Goodwill
6,586

 
(1,988
)
(3) 
4,598

 
$
47,895

 
$
(1,832
)
 
$
46,063

 
March 31,
2017
 
Net
Additions
 
March 31,
2018
 
(in millions)
FCC licenses
$
36,550

 
$
724

(1) 
$
37,274

Trademarks
4,035

 
—

 
4,035

Goodwill (3)
6,579

 
7

(2) 
6,586

 
$
47,164

 
$
731

 
$
47,895


 _________________
(1)
During the year ended March 31, 2018, net additions within FCC licenses include a $479 million increase from spectrum license exchanges described below, and approximately $145 million of spectrum licenses as a result of the transaction with PRWireless PR, Inc. described above.
(2)
During the year ended March 31, 2018, $7 million was added to goodwill as a result of the transaction with PRWireless PR, Inc. as described above.
(3)
Intangible Assets Subject to Amortization
 
 
 
March 31, 2019
 
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

 
$
(6,029
)
 
$
534

 
$
6,562

 
$
(5,462
)
 
$
1,100

Other intangible assets:
 
 
 
 
 
 
 
 
 
 
 
 
Favorable spectrum leases
23 years
 
763

 
(150
)
 
613

 
856

 
(172
)
 
684

Favorable tower leases
9 years
 
335

 
(215
)
 
120

 
335

 
(179
)
 
156

Trademarks
2 to 34 years
 
520

 
(89
)
 
431

 
520

 
(74
)
 
446

Other
5 to 10 years
 
137

 
(66
)
 
71

 
129

 
(50
)
 
79

Total other intangible assets
 
1,755

 
(520
)
 
1,235

 
1,840

 
(475
)
 
1,365

Total definite-lived intangible assets
 
$
8,318

 
$
(6,549
)
 
$
1,769

 
$
8,402

 
$
(5,937
)
 
$
2,465
Intangible Assets Subject to Amortization, Future Amortization Expense
 
Fiscal Year 2019
 
Fiscal Year 2020
 
Fiscal Year 2021
 
Fiscal Year 2022
 
Fiscal Year 2023
 
(in millions)
Estimated amortization expense
$
467

 
$
263

 
$
110

 
$
71

 
$
55