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Acquisitions - Intangible Assets (Details) - USD ($)
$ in Millions
Aug. 30, 2021
Aug. 09, 2021
Mar. 11, 2020
L&M | Customer relationships      
Acquired Finite-Lived Intangible Assets [Line Items]      
Intangible Asset Amount $ 19    
Amortization Period 10 years    
Discount Rate 15.50%    
Attrition Rate 15.00%    
Pacific Pipe | Customer relationships      
Acquired Finite-Lived Intangible Assets [Line Items]      
Intangible Asset Amount   $ 46  
Amortization Period   10 years  
Discount Rate   11.50%  
Attrition Rate   10.00%  
Pacific Pipe | Trademarks      
Acquired Finite-Lived Intangible Assets [Line Items]      
Intangible Asset Amount   $ 1  
Amortization Period   2 years  
Discount Rate   11.50%  
R&B | Customer relationships      
Acquired Finite-Lived Intangible Assets [Line Items]      
Intangible Asset Amount     $ 114
Amortization Period     15 years
Discount Rate     10.00%
Attrition Rate     7.50%