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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 |  |

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- 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 + Details
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