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Income Tax Expense - Summary of Deferred Tax (Income)/Expense (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
(a) Current tax      
Total current tax expense $ 765 $ 563 $ 543
(b) Deferred tax      
Total deferred tax expense/(income) 20 98 (98)
Income tax reported in the Consolidated Income Statement 785 661 [1] 445 [1]
Derivative financial instruments      
(b) Deferred tax      
Total deferred tax expense/(income) (4) 2 0
Retirement benefit obligations      
(b) Deferred tax      
Total deferred tax expense/(income) (4) 2 (9)
Share-based payment expense      
(b) Deferred tax      
Total deferred tax expense/(income) 1 (6) (2)
Other items      
(b) Deferred tax      
Total deferred tax expense/(income) 27 100 (87)
Republic of Ireland      
(a) Current tax      
Total current tax expense 34 15 23
Overseas      
(a) Current tax      
Total current tax expense $ 731 $ 548 $ 520
[1] Restated to show the results of our former Building Envelope business in discontinued operations. See note 3 for further details.