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Share Capital and Reserves - Summary of Treasury Shares (Parenthetical) (Detail)
$ / shares in Units, € in Millions, $ in Billions
 12 Months Ended
Dec. 31, 2021
USD ($)
$ / shares
Dec. 31, 2020
EUR (€)
$ / shares
Dec. 31, 2021
EUR (€)
Disclosure of Treasury Shares and Own Shares [Line Items]      
Average repurchase price for Treasury shares reissued | $ / shares $ 37.15 $ 32.45  
Total number of own shares held, nominal value | €   $ 0.1 € 0.1
Total number of Treasury Shares held, nominal value | €   $ 1.1 € 3.4
Share repurchase programme [member]      
Disclosure of Treasury Shares and Own Shares [Line Items]      
Share repurchase programme aggregated cash returned to shareholders for share repurchase | $ $ 2.9    
CRH announced a further extension of the programme - cost of additional shares to be repurchased under this phase of the programme | $ $ 0.9