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Income Tax Expense - Summary of Deferred Tax (Income)/Expense (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Current tax      
Total current tax expense $ 618 $ 594 $ 405
Deferred tax      
Total deferred tax expense/(income) 103 (95) 129
Income tax reported in the Consolidated Income Statement 721 499 534
Derivative financial instruments [member]      
Deferred tax      
Total deferred tax expense/(income) 2 0 2
Retirement Benefit Obligations [member]      
Deferred tax      
Total deferred tax expense/(income) 2 (9) (1)
Share-based payment expense [member]      
Deferred tax      
Total deferred tax expense/(income) (6) (3) (6)
Other items [member]      
Deferred tax      
Total deferred tax expense/(income) 105 (83) 134
Republic of Ireland [member]      
Current tax      
Total current tax expense 15 23 20
Overseas [member]      
Current tax      
Total current tax expense $ 603 $ 571 $ 385