XML 286 R124.htm IDEA: XBRL DOCUMENT v3.22.0.1
Property, Plant and Equipment - Schedule of Future Purchase Commitments for Property, Plant and Equipment (Detail) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Disclosure of detailed information about property, plant and equipment [abstract]    
Contracted for but not provided in the financial statements $ 628 $ 423
Authorised by the Directors but not contracted for $ 417 $ 307