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Employee Benefits - Summary of Number of Awards and Movements for all Share Plans (Detail)
$ in Millions
 12 Months Ended
Dec. 31, 2023
USD ($)
shares
Dec. 31, 2022
USD ($)
shares
Employee plans [member] | WEP [member]    
Disclosure Of Number And Weighted Average Exercise Prices Of Other Equity Instruments [Line Items]    
Opening balance 6,629,681 5,649,783
Granted during the year 3,445,234 3,017,366
Vested during the year (600,271) (1,498,065)
Forfeited during the year (349,204) (539,403)
Ending balance 9,125,440 6,629,681
Fair value of awards granted during the year | $ $ 60 $ 49
Employee plans [member] | SWEP [member]    
Disclosure Of Number And Weighted Average Exercise Prices Of Other Equity Instruments [Line Items]    
Opening balance 2,884,076 0
Granted during the year 100,811 3,046,963
Vested during the year (1,071,291) (38,146)
Forfeited during the year (357,023) (124,741)
Ending balance 1,556,573 2,884,076
Fair value of awards granted during the year | $ $ 2 $ 60
Executive plans [member] | STA [member]    
Disclosure Of Number And Weighted Average Exercise Prices Of Other Equity Instruments [Line Items]    
Opening balance 993,197 994,436
Granted during the year 420,429 495,800
Vested during the year (286,979) (450,609)
Forfeited during the year (60,410) (46,430)
Ending balance 1,066,237 993,197
Fair value of awards granted during the year | $ $ 10 $ 9
Executive plans [member] | LTA [member]    
Disclosure Of Number And Weighted Average Exercise Prices Of Other Equity Instruments [Line Items]    
Opening balance 2,554,422 2,379,220
Granted during the year 658,969 764,171
Vested during the year (106,430) (191,736)
Forfeited during the year (410,409) (397,233)
Ending balance 2,696,552 2,554,422
Fair value of awards granted during the year | $ $ 12 $ 13