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Acquisitions (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Oct. 01, 2021
Dec. 31, 2021
Dec. 31, 2021
Business Acquisition [Line Items]      
Business Combination, Acquisition Related Costs     $ 17
Boral Target Companies      
Business Acquisition [Line Items]      
Payments to Acquire Businesses, Gross $ 2,150    
Goodwill, Acquired During Period 771    
Business Combination, Contingent Consideration, Liability, Noncurrent $ 65    
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual   $ 275  
Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual   $ 15