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Summary of Significant Accounting Policies - Amortization (Details) - USD ($) $ in Millions		12 Months Ended
	Jul. 01, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Definite-lived intangible assets
Amortization expense		$ 30	$ 29	$ 30
Expected intangible amortization expense for subsequent years
2021		20
2022		19
2023		19
2024		19
2025		18
Balance thereafter		206
Impairment
Indefinite-lived intangible assets impairment	$ 0	35
Trade names
Impairment
Indefinite-lived intangible assets impairment		$ 35

X

- Definition

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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