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Goodwill and Intangibles - Summary of Identifiable Intangible Assets (Detail) - USD ($) $ in Millions | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2021 | Dec. 31, 2020
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 1,224 | $ 1,198
Accumulated Amortization | (327) | (233)
Net Carrying Amount | $ 897 | $ 965
Contractual Backlog [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Weighted Average Remaining Useful Lives (in Years) | 1 year | 1 year 7 months 6 days
Gross Carrying Amount | $ 101 | $ 101
Accumulated Amortization | (96) | (92)
Net Carrying Amount | $ 5 | $ 9
Customer Relationships [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Weighted Average Remaining Useful Lives (in Years) | 6 years 7 months 6 days | 7 years
Gross Carrying Amount | $ 845 | $ 823
Accumulated Amortization | (195) | (119)
Net Carrying Amount | $ 650 | $ 704
Trade Names [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Weighted Average Remaining Useful Lives (in Years) | 13 years | 13 years 9 months 18 days
Gross Carrying Amount | $ 278 | $ 274
Accumulated Amortization | (36) | (22)
Net Carrying Amount | $ 242 | $ 252

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- Definition Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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- Definition 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. + References No definition available. + Details
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- Definition Amount before accumulated amortization of intangible assets, excluding goodwill. + References No definition available. + Details
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- Definition Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph ((a)(1),(b)) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16212-109274 + Details
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