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Business Combinations - Additional Information (Detail) - USD ($) |  |  | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jul. 26, 2021 | Oct. 01, 2019 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Cash payment |  |  | $ 51,000,000 | $ 6,000,000 |
2021 Acquisitions [Member] |  |  |  |  |
Purchase price consideration transferred |  |  | 68,000,000 |  |
Cash paid at closing |  |  | 51,000,000 |  |
Net revenues from acquisition |  |  | 9,000,000 |  |
Cash payment |  |  | 4,000,000 |  |
Business combination accrued consideration |  |  | 13,000,000 |  |
Goodwill, expected tax deduction |  |  | 21,000,000 |  |
2021 Acquisitions [Member] | Maximum [Member] |  |  |  |  |
Operating income (loss) from acquisition |  |  | 1,000,000 |  |
2020 Acquisitions [Member] |  |  |  |  |
Cash paid at closing |  |  |  |  | $ 329,000,000
Net of cash acquired and accrued consideration |  |  |  |  | 5,000,000
Goodwill, expected tax deduction |  |  |  |  | 20,000,000
2020 Acquisitions [Member] | Safety Services [Member] |  |  |  |  |
Purchase price consideration transferred |  |  |  |  | 324,000,000
Cash payment |  |  |  |  | 319,000,000
Business combination accrued consideration |  |  |  |  | $ 5,000,000
2020 Acquisitions [Member] | Safety Services [Member] | Minimum [Member] |  |  |  |  |
Business combination accrued consideration paid out period |  |  |  |  | 1 year
APi Acquisition [Member] |  |  |  |  |
Contingent compensation |  |  | 13,000,000 |  | $ 39,000,000
Maximum payout of contingent compensation |  |  | 49,000,000 |  | 85,000,000
Payout of accrued contingent compensation |  |  | 13,000,000 |  | 39,000,000
Liability for deferred payments |  |  | $ 13,000,000 |  | $ 16,000,000
APi Acquisition [Member] | Minimum [Member] |  |  |  |  |
Contingent compensation arrangements recognized period |  | 3 years |  |  |
Liability for deferred payments recognition period |  | 12 months |  |  |
APi Acquisition [Member] | Maximum [Member] |  |  |  |  |
Contingent compensation arrangements recognized period |  | 5 years |  |  |
Liability for deferred payments recognition period |  | 24 months |  |  |
Chubb Limited Fire and Security Business [Member] |  |  |  |  |
Purchase price consideration transferred | $ 3,100,000,000 |  |  |  |
Cash acquired | 2,900,000,000 |  |  |  |
Assumed liabilities, and other adjustments | $ 200,000,000 |  |  |  |

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- Definition Business combination pro forma information operating income loss of acquiree since acquisition date actual. + References No definition available. + Details
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- Definition The amount of goodwill arising from a business combination that is expected to be deductible for tax purposes. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=120321790&loc=d3e6927-128479 + Details
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- Definition Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=116859721&loc=d3e6613-128477 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=120321790&loc=d3e6927-128479 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=116859721&loc=d3e6578-128477 + Details
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- Definition Amount of liabilities incurred by the acquirer as part of consideration transferred in a business combination. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=116859721&loc=d3e6578-128477 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 25 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6911189&loc=d3e6405-128476 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=120321790&loc=d3e6927-128479 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=116859721&loc=d3e6613-128477 + Details
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- Definition This element represents the amount of revenue of the acquiree since the acquisition date included in the consolidated income statement for the reporting period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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- Definition The cash inflow associated with the acquisition of business during the period (for example, cash that was held by the acquired business). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3179-108585 + Details
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- Definition The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=120321790&loc=d3e6927-128479 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3213-108585 + Details
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