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Risks Arising from Financial Instruments - Summary of Carrying Amount of Financial Assets (Detail) - USD ($)
$ in Millions
Jun. 30, 2020
Dec. 31, 2019
Disclosure of credit risk exposure [line items]    
Gross $ 31,236 $ 13,807
Debt Securities [Member]    
Disclosure of credit risk exposure [line items]    
Gross 123 117
Trade receivables [member]    
Disclosure of credit risk exposure [line items]    
Gross 3,465 4,046
Cash Deposits for Guarantees [Member]    
Disclosure of credit risk exposure [line items]    
Gross 170 219
Loans to customers [member]    
Disclosure of credit risk exposure [line items]    
Gross 135 177
Other receivables [member]    
Disclosure of credit risk exposure [line items]    
Gross 1,391 1,563
Derivatives [member]    
Disclosure of credit risk exposure [line items]    
Gross 842 362
Cash and Cash Equivalent [Member]    
Disclosure of credit risk exposure [line items]    
Gross 25,018 7,238
Equity instruments [member]    
Disclosure of credit risk exposure [line items]    
Gross 92 85
Gross carrying amount [member]    
Disclosure of credit risk exposure [line items]    
Gross 31,601 14,090
Gross carrying amount [member] | Debt Securities [Member]    
Disclosure of credit risk exposure [line items]    
Gross 123 117
Gross carrying amount [member] | Trade receivables [member]    
Disclosure of credit risk exposure [line items]    
Gross 3,730 4,219
Gross carrying amount [member] | Cash Deposits for Guarantees [Member]    
Disclosure of credit risk exposure [line items]    
Gross 170 219
Gross carrying amount [member] | Loans to customers [member]    
Disclosure of credit risk exposure [line items]    
Gross 135 177
Gross carrying amount [member] | Other receivables [member]    
Disclosure of credit risk exposure [line items]    
Gross 1,484 1,666
Gross carrying amount [member] | Derivatives [member]    
Disclosure of credit risk exposure [line items]    
Gross 842 362
Gross carrying amount [member] | Cash and Cash Equivalent [Member]    
Disclosure of credit risk exposure [line items]    
Gross 25,018 7,238
Gross carrying amount [member] | Equity instruments [member]    
Disclosure of credit risk exposure [line items]    
Gross 99 92
Impairment losses [member]    
Disclosure of credit risk exposure [line items]    
Gross (365) (283)
Impairment losses [member] | Trade receivables [member]    
Disclosure of credit risk exposure [line items]    
Gross (265) (173)
Impairment losses [member] | Other receivables [member]    
Disclosure of credit risk exposure [line items]    
Gross (93) (103)
Impairment losses [member] | Equity instruments [member]    
Disclosure of credit risk exposure [line items]    
Gross $ (7) $ (7)