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(8)听听Goodwill and Other Intangible Assets

Goodwill

Changes in the carrying amount of goodwill are as follows:

Other Intangible Assets Not Subject to Amortization

Other intangible assets not subject to amortization, not separately disclosed, are trademarks ($1,242 million and $1,262听million) at December听31, 2020 and 2019 and franchise rights owned by Braves Holdings ($143听million) as of December听31, 2020 and 2019. We identified these assets as indefinite life intangible assets after considering the expected use of the assets, the regulatory and economic environment within which they are used and the effects of obsolescence on their use. Sirius XM Holdings鈥� Federal Communications Commission (鈥淔CC鈥�) licenses for its Sirius satellites expire in 2022 and 2025 and the FCC licenses for its XM satellites expire in 2021, 2022 and 2026. Prior to expiration, Sirius XM Holdings is required to apply for a renewal of its FCC licenses. The renewal and extension of its licenses is reasonably certain at minimal cost, which is expensed as incurred. Each of the FCC licenses authorizes Sirius XM Holdings to use the broadcast spectrum, which is a renewable, reusable resource that does not deplete or exhaust over time.

Intangible Assets Subject to Amortization

Intangible assets subject to amortization are comprised of the following:

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The FIA Agreement is amortized over 35 years, customer relationships are amortized over 10-15 years and licensing agreements are amortized over 15 years. Amortization expense was $815听million, $790听million and $654听million for the years ended December听31, 2020, 2019 and 2018, respectively. Based on its amortizable intangible assets as of December听31, 2020, Liberty expects that amortization expense will be as follows for the next five years (amounts in millions):

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Impairments

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Due to an increase in projected costs related to royalty rates from streaming, increasing uncertainty surrounding the projected demand for advertising and a decrease in listening hours, impairment losses of $956 million and $20 million were recorded during the year ended December 31, 2020 related to Pandora鈥檚 goodwill and trademark, respectively. The fair value of the Pandora reporting unit was determined using a combination of market multiples (market approach) and discounted cash flow (income approach) calculations (Level 3). The discounted cash flow model relies on making assumptions, such as the extent of the economic downturn related to the COVID-19 pandemic, the expected timing of recovery, expected growth in profitability and discount rate. 听Additionally, assumptions related to guideline company financial multiples used in the market approach decreased based on current market observations. As of December 31, 2020, accumulated goodwill impairment losses for Liberty totaled $956 million.