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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, 2024
USD ($)
shares
Dec. 31, 2023
USD ($)
shares
Employee Plans [member] | WEP [member]    
Disclosure Of Number And Weighted Average Exercise Prices Of Other Equity Instruments [Line Items]    
Opening balance 9,125,440 6,629,681
Granted during the year 5,188,220 3,445,234
Vested during the year (1,833,896) (600,271)
Forfeited during the year (716,686) (349,204)
Ending balance 11,763,078 9,125,440
Fair value of awards granted during the year | $ $ 70 $ 60
Employee Plans [member] | SWEP [member]    
Disclosure Of Number And Weighted Average Exercise Prices Of Other Equity Instruments [Line Items]    
Opening balance 1,556,573 2,884,076
Granted during the year 48,179 100,811
Vested during the year (1,038,583) (1,071,291)
Forfeited during the year (108,599) (357,023)
Ending balance 457,570 1,556,573
Fair value of awards granted during the year | $ $ 1 $ 2
Executive Plans [member] | STA [member]    
Disclosure Of Number And Weighted Average Exercise Prices Of Other Equity Instruments [Line Items]    
Opening balance 1,066,237 993,197
Granted during the year 918,543 420,429
Vested during the year (231,156) (286,979)
Forfeited during the year (201,956) (60,410)
Ending balance 1,551,668 1,066,237
Fair value of awards granted during the year | $ $ 18 $ 10
Executive Plans [member] | LTA [member]    
Disclosure Of Number And Weighted Average Exercise Prices Of Other Equity Instruments [Line Items]    
Opening balance 2,696,552 2,554,422
Granted during the year 364,378 658,969
Vested during the year (250,149) (106,430)
Forfeited during the year (361,735) (410,409)
Ending balance 2,449,046 2,696,552
Fair value of awards granted during the year | $ $ 8 $ 12