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Share Capital and Reserves - Summary of Treasury Shares (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure of Treasury Shares and Own Shares [Line Items]      
Beginning balance $ (386)    
Ending balance (195) $ (386)  
Treasury Shares/Own Shares [member]      
Disclosure of Treasury Shares and Own Shares [Line Items]      
Beginning balance (386) (360)  
Own Shares released by the Employee Benefit Trust under the 2014 Performance Share Plan 117 65  
Shares acquired by CRH plc (Treasury Shares) (880) (220)  
Shares acquired by Employee Benefit Trust (own shares) (16) (29)  
Treasury Shares/own shares reissued 19 8  
Cancellation of treasury shares 951 150 $ 1,402
Ending balance $ (195) $ (386) $ (360)
Shares outstanding, beginning balance 10,320,739 10,236,356  
Own Shares released by the Employee Benefit Trust under the 2014 Performance Share Plan (3,254,236) (2,180,467)  
Shares acquired by CRH plc (Treasury Shares) (i) [1] 17,829,602 5,951,146  
Shares acquired by Employee Benefit Trust (own shares) 345,981 1,070,225  
Treasury Shares/own shares reissued (ii) [2] (521,523) (256,521)  
Cancellation of treasury shares (21,000,000) (4,500,000)  
Treasury Shares [3] 3,476,859 10,087,161  
Own shares [3] 243,704 233,578  
Shares outstanding, ending balance 3,720,563 10,320,739 10,236,356
[1] During 2021, CRH repurchased a total of 17,829,602 Ordinary Shares returning a further $0.9 billion of cash to shareholders. This brings total cash returned to shareholders under the share buyback programme (‘the Programme’) to $2.9 billion since its commencement in May 2018.
[2] These reissued Treasury Shares were previously purchased at an average price of $37.15 (2020: $32.45).
[3] As at the balance sheet date, the nominal value of the Treasury Shares and own shares was €1.1 million and €0.1 million respectively (2020: €3.4 million and €0.1 million respectively). Dividends have been waived by the Trustees of the own shares.