Intangible Assets - Definite Life Intangible Assets (Details) - USD ($)	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Definite life intangible assets:
Impairment of definite-lived intangible assets	$ 0	$ 0	$ 0
Amortization of intangible assets	141,000,000	23,000,000	38,000,000
Retired
Definite life intangible assets:
Intangible assets	0	$ 390,000,000	$ 0
Pandora
Definite life intangible assets:
Finite-lived intangible assets	$ 776,000,000

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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- Definition

The amount of identifiable intangible assets recognized as of the acquisition date.

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- Definition

Amount classified as intangible assets, excluding goodwill, attributable to disposal group held for sale or disposed of.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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The amount of impairment loss recognized in the period resulting from the write-down of the carrying amount of a finite-lived intangible asset to fair value.

+ References

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