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Transactions - Additional Information (Detail) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) Acquisition | Dec. 31, 2018 USD ($)
Transactions [Line Items] |  |  |
Assets held-for-sale |  | $ 34,000,000 |
Asset impairment charges | $ 321,000,000 | 128,000,000 |
Goodwill | 0 | $ 245,000,000 | $ 314,000,000
Two Acquisitions [Member] |  |  |
Transactions [Line Items] |  |  |
Number of acquisitions | Acquisition |  | 2 |
Purchase price consideration |  | $ 8,000,000 |
Goodwill |  | 6,000,000 |
Intangible assets |  | 2,000,000 |
Maximum [Member] | Two Acquisitions [Member] |  |  |
Transactions [Line Items] |  |  |
Acquisition related costs |  | 1,000,000 |
Impairment charges [Member] |  |  |
Transactions [Line Items] |  |  |
Loss on sale of business | $ (1,000,000) |  |
Held-for-Sale [Member] |  |  |
Transactions [Line Items] |  |  |
Assets held-for-sale |  | 34,000,000 |
Liabilities held-for-sale |  | 6,000,000 |
Asset impairment charges |  | $ 9,000,000 |

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- Definition Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill. + 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 360 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=109226348&loc=d3e2420-110228 + Details
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- Definition This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=116868678&loc=d3e1043-128460 + Details
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- Definition Amount of gain (loss) from sale and disposal of integrated set of activities and assets capable of being conducted and managed for purpose of providing return in form of dividend, lower cost, or other economic benefit to investor, owner, member and participant. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -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://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1B -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109239629&loc=SL4582445-111684 + Details
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