Intangible Assets (Tables)

3 Months Ended

Jun. 30, 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		June 30, 2018
	(in millions)
FCC licenses	$	37,274	$	59	$	37,333
Trademarks	4,035		—		4,035
Goodwill(1)	6,586		—		6,586
	$	47,895	$	59	$	47,954

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(1) Through June 30, 2018, there is no accumulated impairment losses for goodwill.

Intangible Assets Subject to Amortization

		June 30, 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	$	6,562	$	(5,623	)	$	939	$	6,562	$	(5,462	)	$	1,100
Other intangible assets:
Favorable spectrum leases	23 years	856		(216		)	640		856		(172		)	684
Favorable tower leases	7 years	335		(188		)	147		335		(179		)	156
Trademarks	2 to 34 years	520		(78		)	442		520		(74		)	446
Other	5 to 10 years	131		(54		)	77		129		(50		)	79
Total other intangible assets		1,842		(536		)	1,306		1,840		(475		)	1,365
Total definite-lived intangible assets		$	8,404	$	(6,159	)	$	2,245	$	8,402	$	(5,937	)	$	2,465