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Earnings per share - Reconciliation between shares used in calculating basic and diluted EPS (Detail) - shares
shares in Millions
6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Earnings per share [abstract]    
Weighted average shares used in basic EPS calculation 1,115.2 1,211.9
Dilutive share options outstanding 1.4 0.8
Other potentially issuable shares 21.2 16.3
Weighted average shares used in diluted EPS calculation 1,137.8 1,229.0