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Dividends - Summary of Dividends Paid and Proposed (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure of Dividends [line items]      
Dividends paid $ 941 $ 725 $ 663
Translation adjustment (ii) [1] (3) (3)  
Dividends paid to equity holders of the Company 906 707 652
Dividends paid by subsidiaries to non-controllinginterests 32 15 11
Total dividends paid 938 722 663
Final 2021 - proposed 98.00c per Ordinary Share (2020: 93.00c; 2019: 70.00c) (ii) [2] 751 730 550
Final Dividends [member]      
Disclosure of Dividends [line items]      
Dividends paid [2],[3] 730 537 477
Interim Dividends [member]      
Disclosure of Dividends [line items]      
Dividends paid [1],[3] 179 173 175
Retained earnings [member]      
Disclosure of Dividends [line items]      
Dividends paid 909 710 652
Total [member]      
Disclosure of Dividends [line items]      
Dividends paid [3] $ 909 $ 710 $ 652
[1] Translation adjustment arising from US Dollar declared dividends paid in non-US Dollar currencies.
[2] Interim and final dividends per share declared previously in euro have been translated to US Dollar using the dividend record date exchange rate.
[3] In 2021 the 5% Cumulative Preference Shares paid a dividend of €3,175 (2020: €3,175; 2019: €3,175) and the 7% ‘A’ Cumulative Preference Shares paid a dividend of €77,521 (2020: €77,521; 2019: €77,521).