Goodwill, Spectrum License Transactions and Other Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2019

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Goodwill

The changes in the carrying amount of goodwill for the years ended December 31, 2019 and 2018, are as follows:

(in millions)	Goodwill
Historical goodwill	$	12,449
Goodwill from acquisition of Layer3 TV	218
Accumulated impairment losses at December 31, 2018	(10,766)
Balance as of December 31, 2018	1,901
Goodwill from acquisition in 2019	29
Balance as of December 31, 2019	$	1,930
Accumulated impairment losses at December 31, 2019	$	(10,766)

Schedule of Spectrum Licenses

The following table summarizes our spectrum license activity for the years ended December 31, 2019 and 2018:

(in millions)	2019		2018
Spectrum licenses, beginning of year	$	35,559	$	35,366
Spectrum license acquisitions	857		138
Spectrum licenses transferred to held for sale	—		(1)
Costs to clear spectrum	49		56
Spectrum licenses, end of year	$	36,465	$	35,559

Schedule of Other Intangible Assets

The components of Other intangible assets were as follows:

	Useful Lives	December 31, 2019						December 31, 2018
(in millions)		Gross Amount		Accumulated Amortization		Net Amount		Gross Amount		Accumulated Amortization		Net Amount
Customer lists	Up to 6 years	$	1,104	$	(1,104)	$	—	$	1,104	$	(1,086)	$	18
Trademarks and patents	Up to 19 years	323		(258)		65		312		(225)		87
Other	Up to 28 years	100		(50)		50		149		(56)		93
Other intangible assets		$	1,527	$	(1,412)	$	115	$	1,565	$	(1,367)	$	198

Schedule of Estimated Aggregate Future Amortization Expense

The estimated aggregate future amortization expense for intangible assets subject to amortization are summarized below:

(in millions)	Estimated Future Amortization
Year Ending December 31,
2020	$	83
2021	14
2022	3
2023	3
2024	3
Thereafter	9
Total	$	115