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Employee Benefits - Summary of Number of Awards and Movements for all Share Plans (Detail) $ in Millions | 12 Months Ended
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Dec. 31, 2022 USD ($) shares | Dec. 31, 2021 USD ($) shares
Employee plans [member] | WEP [member] |  |
Disclosure Of Number And Weighted Average Exercise Prices Of Other Equity Instruments [Line Items] |  |
Opening balance | 5,649,783 | 5,618,603
Granted during the year | 3,017,366 | 2,507,167
Vested during the year | (1,498,065) | (1,999,676)
Forfeited during the year | (539,403) | (476,311)
Ending balance | 6,629,681 | 5,649,783
Fair value of awards granted during the year | $ | $ 49 | $ 39
Employee plans [member] | SWEP [member] |  |
Disclosure Of Number And Weighted Average Exercise Prices Of Other Equity Instruments [Line Items] |  |
Opening balance | 0 |
Granted during the year | 3,046,963 |
Vested during the year | (38,146) |
Forfeited during the year | (124,741) |
Ending balance | 2,884,076 | 0
Fair value of awards granted during the year | $ | $ 60 |
Executive plans [member] | STA [member] |  |
Disclosure Of Number And Weighted Average Exercise Prices Of Other Equity Instruments [Line Items] |  |
Opening balance | 994,436 | 975,295
Granted during the year | 495,800 | 353,412
Vested during the year | (450,609) | (307,402)
Forfeited during the year | (46,430) | (26,869)
Ending balance | 993,197 | 994,436
Fair value of awards granted during the year | $ | $ 9 | $ 7
Executive plans [member] | LTA [member] |  |
Disclosure Of Number And Weighted Average Exercise Prices Of Other Equity Instruments [Line Items] |  |
Opening balance | 2,379,220 | 2,798,305
Granted during the year | 764,171 | 553,849
Vested during the year | (191,736) | (322,746)
Forfeited during the year | (397,233) | (650,188)
Ending balance | 2,554,422 | 2,379,220
Fair value of awards granted during the year | $ | $ 13 | $ 9

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