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Income Tax Expense - Schedule of Changes in Consolidated Deferred Income Taxes (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
(a) Within the Consolidated Statement of Comprehensive Income:      
Deferred tax - retirement benefit obligations $ (36) $ 11 $ (4)
Tax on items recognised directly within other comprehensive income (44) 11 (8)
(b) Within the Consolidated Statement of Changes in Equity:      
Deferred tax - share-based payment expense (10) 1  
Curent And Deferred Tax Relating To Items Charged Or Credited Directly To Equity, Total 24 1 11
Income tax recognised outside the Consolidated Income Statement (20) 12 3
Retirement Benefit Obligations [member]      
(a) Within the Consolidated Statement of Comprehensive Income:      
Deferred tax - retirement benefit obligations (36) 11 (4)
Cash Flow Hedges [member]      
(a) Within the Consolidated Statement of Comprehensive Income:      
Deferred tax - cash flow hedges (8) 0 (4)
Share option exercise [member]      
(b) Within the Consolidated Statement of Changes in Equity:      
Current tax - share option exercises 14 2 5
Share-based payment expense [member]      
(b) Within the Consolidated Statement of Changes in Equity:      
Deferred tax - share-based payment expense $ 10 $ (1) $ 6