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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, 2020
USD ($)
Goodwill [LineItems]  
Beginning Balance $ 980
Acquisitions 3
Impairments (193)
Measurement period adjustments and other (2) 61
Ending Balance 851
Safety Services [Member]  
Goodwill [LineItems]  
Beginning Balance 639
Acquisitions 1
Impairments (83)
Measurement period adjustments and other (2) 118
Ending Balance 675
Specialty Services [Member]  
Goodwill [LineItems]  
Beginning Balance 290
Acquisitions 2
Impairments (52)
Measurement period adjustments and other (2) (68)
Ending Balance 172
Industrial Services [Member]  
Goodwill [LineItems]  
Beginning Balance 51
Impairments (58)
Measurement period adjustments and other (2) 11
Ending Balance $ 4