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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.

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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

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- Definition

Amount before accumulated amortization of intangible assets, excluding goodwill.

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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
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-Topic 350
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-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16212-109274

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