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Acquisitions - Intangible Assets (Details) - USD ($)
$ in Millions
Aug. 30, 2021
Aug. 09, 2021
Aug. 17, 2020
Mar. 11, 2020
Jul. 08, 2019
Feb. 04, 2019
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%        
WWSC | Customer relationships            
Acquired Finite-Lived Intangible Assets [Line Items]            
Intangible Asset Amount     $ 6      
Amortization Period     10 years      
Discount Rate     13.00%      
Attrition Rate     15.00%      
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%    
LIP | Customer relationships - retail            
Acquired Finite-Lived Intangible Assets [Line Items]            
Intangible Asset Amount         $ 90  
Amortization Period         10 years  
Discount Rate         14.00%  
Attrition Rate         12.50%  
LIP | Customer relationships - distribution            
Acquired Finite-Lived Intangible Assets [Line Items]            
Intangible Asset Amount         $ 3  
Amortization Period         15 years  
Discount Rate         14.00%  
Attrition Rate         5.00%  
LIP | Other intangibles            
Acquired Finite-Lived Intangible Assets [Line Items]            
Intangible Asset Amount         $ 1  
Maskell | Customer relationships            
Acquired Finite-Lived Intangible Assets [Line Items]            
Intangible Asset Amount           $ 5
Amortization Period           10 years
Discount Rate           13.00%
Attrition Rate           12.50%