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Income taxes - Summary of reconciliation of effective tax rate (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Reconciliation of accounting profit multiplied by applicable tax rates [abstract]      
Loss before tax $ (3,552) $ (2,743) $ (3,981)
Tax at the domestic rates applicable to profits in the countries where the Group operates (238) (241) (606)
Non-deductible expenses 46 66 108
Current year losses for which no deferred tax asset is recognized 211 196 513
Benefits from previously unrecognized tax losses (16) (19) (10)
Changes in estimates related to prior years [1] [1] 2
Income tax expense $ 3 $ 2 $ 7
[1] Amount less than $1 million