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v3.20.2

Revenue - Summary of Disaggregated Revenue (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Disaggregation of Revenue [Line Items] |  |  |  |
Net revenues | $ 958 | $ 1,118 | $ 2,705 | $ 3,107
United States [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net revenues | 901 | 1,050 | 2,557 | 2,883
Canada and United Kingdom [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net revenues | 57 | 68 | 148 | 224
Life Safety [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net revenues | 322 | 363 | 963 | 1,038
Mechanical [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net revenues | 82 | 109 | 236 | 304
Infrastructure/Utility [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net revenues | 230 | 241 | 615 | 645
Fabrication [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net revenues | 58 | 44 | 129 | 114
Specialty Contracting [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net revenues | 112 | 122 | 305 | 348
Transmission [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net revenues | 127 | 156 | 336 | 443
Civil [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net revenues | 25 | 29 | 50 | 45
Inspection [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net revenues | 6 | 60 | 82 | 182
Corporate and Eliminations [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net revenues | (4) | (6) | (11) | (12)
Safety Services [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net revenues | 404 | 472 | 1,199 | 1,342
Safety Services [Member] | United States [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net revenues | 361 | 416 | 1,074 | 1,185
Safety Services [Member] | Canada and United Kingdom [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net revenues | 43 | 56 | 125 | 157
Safety Services [Member] | Life Safety [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net revenues | 322 | 363 | 963 | 1,038
Safety Services [Member] | Mechanical [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net revenues | 82 | 109 | 236 | 304
Specialty Services [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net revenues | 400 | 407 | 1,049 | 1,107
Specialty Services [Member] | United States [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net revenues | 400 | 407 | 1,049 | 1,107
Specialty Services [Member] | Infrastructure/Utility [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net revenues | 230 | 241 | 615 | 645
Specialty Services [Member] | Fabrication [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net revenues | 58 | 44 | 129 | 114
Specialty Services [Member] | Specialty Contracting [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net revenues | 112 | 122 | 305 | 348
Industrial Services [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net revenues | 158 | 245 | 468 | 670
Industrial Services [Member] | United States [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net revenues | 144 | 233 | 445 | 603
Industrial Services [Member] | Canada and United Kingdom [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net revenues | 14 | 12 | 23 | 67
Industrial Services [Member] | Transmission [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net revenues | 127 | 156 | 336 | 443
Industrial Services [Member] | Civil [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net revenues | 25 | 29 | 50 | 45
Industrial Services [Member] | Inspection [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net revenues | 6 | 60 | 82 | 182
Corporate and Eliminations [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net revenues | (4) | (6) | (11) | (12)
Corporate and Eliminations [Member] | United States [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net revenues | (4) | (6) | (11) | (12)
Corporate and Eliminations [Member] | Corporate and Eliminations [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net revenues | $ (4) | $ (6) | $ (11) | $ (12)

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