GOODWILL AND INTANGIBLES (Tables)

12 Months Ended

Dec. 31, 2023

Goodwill and Intangible Assets Disclosure [Abstract]

Summary of Changes In Carrying Amounts of Goodwill By Reportable Segments

	Safety Services		Specialty Services		Total Goodwill
Goodwill as of December 31, 2021	$	925	$	181	$	1,106
Acquisitions	1,372		—		1,372
Foreign currency translation and other, net (1)	(96)		—		(96)
Goodwill as of December 31, 2022	2,201		181		2,382
Acquisitions	47		—		47
Impairment of goodwill (2)	—		(4)		(4)
Foreign currency translation	46		—		46
Goodwill as of December 31, 2023	$	2,294	$	177	$	2,471

(1)Other includes immaterial measurement period adjustments recorded during the year ended December 31, 2022 related to acquisitions for which the measurement period ended during the year ended December 31, 2022.

(2)The Company sold an operating company (See Note 5 - "Divestitures"). Pursuant to the authoritative literature, the Company evaluated the recoverability of the carrying value of the assets and liabilities and recorded a goodwill impairment charge of $4.

Summary of Identifiable Intangible Assets

The Company's identifiable intangible assets are comprised of the following as of December 31, 2023 and 2022:

	December 31, 2023
	Weighted Average Remaining Useful Lives (in Years)	Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount
Amortized intangibles:
Contractual backlog	0.5	$	155	$	(154)	$	1
Customer relationships	9.4	1,552		(518)		1,034
Trade names and trademarks	12.1	722		(137)		585
Total		$	2,429	$	(809)	$	1,620

	December 31, 2022
	Weighted Average Remaining Useful Lives (in Years)	Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount
Amortized intangibles:
Contractual backlog	0.9	$	153	$	(126)	$	27
Customer relationships	10.0	1,508		(367)		1,141
Trade names and trademarks	13.2	704		(88)		616
Total		$	2,365	$	(581)	$	1,784

Schedule of Aggregate Amortization Expense of the Intangible

Approximate annual aggregate amortization expense of the intangible assets for the five years subsequent to December 31, 2023, is as follows:

Years ending December 31:
2024	$	201
2025	201
2026	201
2027	177
2028	107
Thereafter	733
Total	$	1,620

Summary of Amortization Expense Recognized on Intangible Assets

Amortization expense recognized on identifiable intangible assets are as follows:

	Year Ended December 31,
	2023		2022		2021
Cost of revenues	$	27	$	30	$	5
Selling, general, and administrative expenses	197		197		122
Total intangible asset amortization expense	$	224	$	227	$	127