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Income Tax Expense - Reconciliation of Applicable Tax Rate to Effective Tax Rate (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Reconciliation of average effective tax rate and applicable tax rate [abstract]      
Profit before tax from continuing operations $ 3,342 $ 1,664 $ 2,181
Tax charge expressed as a percentage of profit before tax (effective tax rate):      
- current tax expense only 18.50% 35.70% 18.60%
- total income tax expense (current and deferred) 21.60% 30.00% 24.50%
Irish corporation tax rate 12.50% 12.50% 12.50%
Higher tax rates on overseas earnings 9.80% 10.60% 12.80%
- arising from 2020 impairment 0.00% 8.40%  
- other items (primarily comprising items not chargeable to tax/expenses not deductible for tax) (0.70%) (1.50%) (0.80%)
Total effective tax rate 21.60% 30.00% 24.50%