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Goodwill and Intangibles - Summary of Identifiable Intangible Assets (Detail) - USD ($)
$ in Millions
9 Months Ended 12 Months Ended
Sep. 30, 2021
Dec. 31, 2020
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount $ 1,224 $ 1,198
Accumulated Amortization (327) (233)
Net Carrying Amount $ 897 $ 965
Contractual Backlog [Member]    
Finite-Lived Intangible Assets [Line Items]    
Weighted Average Remaining Useful Lives (in Years) 1 year 1 year 7 months 6 days
Gross Carrying Amount $ 101 $ 101
Accumulated Amortization (96) (92)
Net Carrying Amount $ 5 $ 9
Customer Relationships [Member]    
Finite-Lived Intangible Assets [Line Items]    
Weighted Average Remaining Useful Lives (in Years) 6 years 7 months 6 days 7 years
Gross Carrying Amount $ 845 $ 823
Accumulated Amortization (195) (119)
Net Carrying Amount $ 650 $ 704
Trade Names [Member]    
Finite-Lived Intangible Assets [Line Items]    
Weighted Average Remaining Useful Lives (in Years) 13 years 13 years 9 months 18 days
Gross Carrying Amount $ 278 $ 274
Accumulated Amortization (36) (22)
Net Carrying Amount $ 242 $ 252