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Goodwill and Intangibles - Summary of Identifiable Intangible Assets (Detail) - USD ($) $ in Millions | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2020 | Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items] |  |
Net Carrying Amount | $ 921 | $ 1,121
APi Acquisition [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 1,104 | 1,172
Accumulated Amortization | (183) | (51)
Net Carrying Amount | $ 921 | $ 1,121
Backlog Intangibles [Member] | APi Acquisition [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Estimated Useful Lives (in Years) | 1 year | 1 year
Gross Carrying Amount | $ 99 | $ 112
Accumulated Amortization | (73) | (22)
Net Carrying Amount | $ 26 | $ 90
Customer Relationships [Member] | APi Acquisition [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Estimated Useful Lives (in Years) | 8 years | 8 years
Gross Carrying Amount | $ 747 | $ 755
Accumulated Amortization | (93) | (24)
Net Carrying Amount | $ 654 | $ 731
Trade Names [Member] | APi Acquisition [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Estimated Useful Lives (in Years) | 15 years | 15 years
Gross Carrying Amount | $ 258 | $ 305
Accumulated Amortization | (17) | (5)
Net Carrying Amount | $ 241 | $ 300

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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 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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