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Intangible Assets (Tables)
 12 Months Ended
Mar. 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,
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

 
March 31,
2016
 
Net
Additions
 
March 31,
2017
 
(in millions)
FCC licenses
$
36,038

 
$
512

 
$
36,550

Trademarks
4,035

 
—

 
4,035

Goodwill (3)
6,575

 
4

 
6,579

 
$
46,648

 
$
516

 
$
47,164


 _________________
(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 $150 million of spectrum licenses as a result of the transaction with PRWireless PR, Inc. described above.
(2)
During the year ended March 31, 2018, approximately $7 million was added to goodwill as a result of the transaction with PRWireless PR, Inc. as described above.
(3)
Through March 31, 2018 there is no accumulated impairment losses for goodwill.
Intangible Assets Subject to Amortization
 
 
 
March 31, 2018
 
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
5 to 8 years
 
$
6,562

 
$
(5,462
)
 
$
1,100

 
$
6,923

 
$
(5,053
)
 
$
1,870

Other intangible assets:
 
 
 
 
 
 
 
 
 
 
 
 
Favorable spectrum leases
23 years
 
856

 
(172
)
 
684

 
869

 
(138
)
 
731

Favorable tower leases
7 years
 
335

 
(179
)
 
156

 
589

 
(386
)
 
203

Trademarks
2 to 34 years
 
520

 
(74
)
 
446

 
520

 
(58
)
 
462

Other
5 to10 years
 
129

 
(50
)
 
79

 
91

 
(37
)
 
54

Total other intangible assets
 
1,840

 
(475
)
 
1,365

 
2,069

 
(619
)
 
1,450

Total definite-lived intangible assets
 
$
8,402

 
$
(5,937
)
 
$
2,465

 
$
8,992

 
$
(5,672
)
 
$
3,320
Intangible Assets Subject to Amortization, Future Amortization Expense
 
Fiscal Year 2018
 
Fiscal Year 2019
 
Fiscal Year 2020
 
Fiscal Year 2021
 
Fiscal Year 2022
 
(in millions)
Estimated amortization expense
$
673

 
$
469

 
$
265

 
$
111

 
$
71