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

6 Months Ended

Jun. 30, 2021

The changes in the carrying amount of goodwill for the six months ended June 30, 2021 and year ended December 31, 2020, are as follows:


(in millions)	Goodwill

Historical goodwill, net of accumulated impairment losses of $10,766	$	1,930
Goodwill from acquisitions in 2020	9,405
Layer3 goodwill impairment	(218)
Balance as of December 31, 2020	11,117

Purchase price adjustment of goodwill from acquisitions in 2020	22
Goodwill from acquisitions in 2021	13

Balance as of June 30, 2021	$	11,152
Accumulated impairment losses at June 30, 2021	$	(10,984)

The following table summarizes the fair value of the intangible assets acquired in the Merger:


	Weighted Average Useful Life (in years)	Fair Value as of April 1, 2020 (in millions)
Spectrum licenses	Indefinite-lived	$	45,400
Tradenames (1)	2 years	207
Customer relationships	8 years	4,900
Favorable spectrum leases	18 years	745
Other intangible assets	7 years	428
Total intangible assets acquired		$	51,680

(1) Tradenames include the Sprint brand.

The following table summarizes our spectrum license activity for the six months ended June 30, 2021:


(in millions)	2021
Spectrum licenses, beginning of year	$	82,828

Spectrum license acquisitions	87
Costs to clear spectrum	2

Spectrum licenses, end of period	$	82,917

The components of Other intangible assets were as follows:

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


(in millions)	Estimated Future Amortization

Twelve Months Ending June 30,
2022	$	1,095
2023	903
2024	746
2025	588
2026	428
Thereafter	840

Total	$	4,600