Goodwill and Intangibles (Tables)

12 Months Ended

Dec. 31, 2022

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, 2020	$	906		$	176	$	1,082
Acquisitions		42			5		47
Measurement period adjustments and other (1)		(23	)		—		(23	)
Goodwill as of December 31, 2021		925			181		1,106
Acquisitions		1,372			—		1,372
Foreign currency translation and other, net (2)		(96	)		—		(96	)
Goodwill as of December 31, 2022	$	2,201		$	181	$	2,382

(1)Measurement period adjustments related to the finalization of purchase accounting for material and immaterial acquisitions in 2021 (see Note 4 - "Business Combinations"). Other includes fluctuations due to foreign currency translation.

(2)Other includes 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 (see Note 4 - "Business Combinations").

Summary of Identifiable Intangible Assets

The Company's identifiable intangible assets are comprised of the following as of December 31, 2022 and 2021:

	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
	December 31, 2021
	Weighted Average Remaining Useful Lives (in Years)		Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount
Amortized intangibles:
Contractual backlog		0.8	$	101	$	(97	)	$	4
Customer relationships		6.4		859		(221	)		638
Trade names and trademarks		12.7		280		(40	)		240
Total			$	1,240	$	(358	)	$	882

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, 2022, is as follows:

Years ending December 31:
2023	$	221
2024		195
2025		195
2026		195
2027		171
Thereafter		807
Total	$	1,784

Summary of Amortization Expense Recognized on Intangible Assets

Amortization expense recognized on identifiable intangible assets are as follows:

	Year Ended December 31,		Year Ended December 31,		Year Ended December 31,
	2022		2021		2020
Cost of revenues	$	30	$	5	$	69
Selling, general, and administrative expenses		197		122		113
Total intangible asset amortization expense	$	227	$	127	$	182