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Revenue and Construction Contracts - Summary of Revenues and Costs Related to Construction Contracts in Progress (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Analysis of income and expense [abstract]      
Revenue from construction contracts included in consolidated revenues, accumulated $ 112    
Costs incurred in construction contracts included in consolidated cost of sales, accumulated (111)    
Construction contracts gross operating profit 1    
Revenue from construction contracts included in consolidated revenues 101 $ 79 $ 72
Costs incurred in construction contracts included in consolidated cost of sales $ (101) $ (79) (68)
Construction contracts gross operating profit     $ 4