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Financial instruments - Summary of Contractual Maturities of Financial Liabilities (Detail) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Carrying amount $ (2,886) $ (11,565)
Non-derivative financial liabilities, undiscounted cash flows (3,549) (16,394)
Less than 1 year    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Non-derivative financial liabilities, undiscounted cash flows   (740)
1 to 5 years    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Non-derivative financial liabilities, undiscounted cash flows   (15,654)
More than 5 years    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Convertible redeemable preference shares [1]  
Bank loans    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Carrying amount 138 212
Bank loans (150) (233)
Bank loans | Less than 1 year    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Bank loans (74) (136)
Bank loans | 1 to 5 years    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Bank loans (76) (97)
Bank loans | More than 5 years    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Bank loans 0 0
Trade and other payables [member]    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Carrying amount 780 586
Trade and other payables (780) (586)
Trade and other payables [member] | Less than 1 year    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Trade and other payables (770) (585)
Trade and other payables [member] | 1 to 5 years    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Trade and other payables (10) (1)
Trade and other payables [member] | More than 5 years    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Trade and other payables 0 0
Lease liabilities [member]    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Carrying amount 123 39
Lease liabilities (197) (40)
Lease liabilities [member] | Less than 1 year    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Lease liabilities (23) (19)
Lease liabilities [member] | 1 to 5 years    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Lease liabilities (58) (21)
Lease liabilities [member] | More than 5 years    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Lease liabilities (116) [1]
Convertible redeemable preference shares [member]    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Carrying amount   10,767
Convertible redeemable preference shares   (15,535)
Convertible redeemable preference shares [member] | Less than 1 year    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Convertible redeemable preference shares   0
Convertible redeemable preference shares [member] | 1 to 5 years    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Convertible redeemable preference shares   (15,535)
Convertible redeemable preference shares [member] | More than 5 years    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Convertible redeemable preference shares   0
Term Loan    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Carrying amount 1,914  
Derivative financial liabilities, undiscounted cash flows (2,422)  
Term Loan | Less than 1 year    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Derivative financial liabilities, undiscounted cash flows (131)  
Term Loan | 1 to 5 years    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Derivative financial liabilities, undiscounted cash flows (2,291)  
Term Loan | More than 5 years    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Derivative financial liabilities, undiscounted cash flows 0  
Total    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Carrying amount 2,955 $ 11,604
Total | Less than 1 year    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Non-derivative financial liabilities, undiscounted cash flows (998)  
Total | 1 to 5 years    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Non-derivative financial liabilities, undiscounted cash flows (2,435)  
Total | More than 5 years    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Non-derivative financial liabilities, undiscounted cash flows $ (116)  
[1] Amount less than $1 million