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Capital and reserves - Summary Of Reserves Of The Group Comprise (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Disclosure of reserves within equity [line items]    
CRPS reserve $ 0 $ 3,850
Share option reserve 382 79
Foreign currency translation reserve (19) 22
Other reserve 243 0
Reserves 606 3,951
Movement of CRPS reserve and liability component [Abstract]    
Balance at January 1 10,767 8,256
Issuance of CRPS 436 1,095
Interest expense 1,570 1,416
Preference shares converted to GHL ordinary shares (12,773) 0
Balance at December 31 $ 0 $ 10,767