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Provisions and post-retirement benefits - Summary of Provisions, including post-retirement benefits (footnotes) (Detail)
€ in Millions, $ in Millions
 6 Months Ended 12 Months Ended
Jun. 30, 2021
USD ($)
Jun. 30, 2021
EUR (€)
Dec. 31, 2020
USD ($)
Disclosure of other provisions [Line Items]      
Employee benefits pre-tax charge $ 3    
Other employee entitlements      
Disclosure of other provisions [Line Items]      
Provision for long service leave 275   $ 283
Provisions for redundancy and severance payments 52   62
Close down and restoration/ environmental      
Disclosure of other provisions [Line Items]      
Closure related receivables 595   $ 574
Wholly or partly funded defined benefit plans      
Disclosure of other provisions [Line Items]      
Present value of pension assets 89    
Cash payment to execute buyout of partially funded pension scheme $ 294 € 247