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Goodwill and Intangibles - Summary of Changes In Carrying Amounts of Goodwill By Reportable Segments (Detail) $ in Millions	9 Months Ended
	Sep. 30, 2021 USD ($)
Goodwill [LineItems]
Beginning Balance	$ 1,082
Acquisitions	35
Measurement period adjustments and other	(18)
Ending Balance	1,099
Safety Services [Member]
Goodwill [LineItems]
Beginning Balance	906
Acquisitions	30
Measurement period adjustments and other	(18)
Ending Balance	918
Specialty Services [Member]
Goodwill [LineItems]
Beginning Balance	172
Acquisitions	5
Ending Balance	177
Industrial Services [Member]
Goodwill [LineItems]
Beginning Balance	4
Ending Balance	$ 4

X

- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

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X

- Definition

Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination.

+ References

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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.

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- Definition

Amount of increase (decrease) from foreign currency translation adjustments and purchase accounting adjustments of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

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