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Trade and Other Receivables - Schedule of Trade Receivables and Other Receivables (Detail) - USD ($)
$ in Millions
Jun. 30, 2020
Dec. 31, 2019
Net carrying amount [member]    
Trade and Other Receivables [line items]    
Trade receivables and accrued income $ 3,465 $ 4,046
Loans to customers 135 177
Interest receivable 6 21
Other receivables 966 979
Current trade and other receivable 4,572 5,223
Neither Impaired Nor Past Due on the Reporting Date [member]    
Trade and Other Receivables [line items]    
Trade receivables and accrued income 3,156 3,690
Loans to customers 133 172
Interest receivable 6 21
Other receivables 938 945
Current trade and other receivable 4,232 4,828
Not Impaired as of the Reporting Date and Past [member] | Less Than 30 Days [member]    
Trade and Other Receivables [line items]    
Trade receivables and accrued income 93 261
Loans to customers   1
Other receivables 1 9
Current trade and other receivable 94 271
Not Impaired as of the Reporting Date and Past [member] | Between 30 and 59 Day [member]    
Trade and Other Receivables [line items]    
Trade receivables and accrued income 64 44
Loans to customers 1 2
Other receivables 18 16
Current trade and other receivable 83 62
Not Impaired as of the Reporting Date and Past [member] | Between 60 and 89 Days [member]    
Trade and Other Receivables [line items]    
Trade receivables and accrued income 75 44
Loans to customers 1 2
Other receivables 3 5
Current trade and other receivable 80 51
Not Impaired as of the Reporting Date and Past [member] | More Than 90 Days [member]    
Trade and Other Receivables [line items]    
Trade receivables and accrued income 77 7
Other receivables 6 4
Current trade and other receivable $ 83 $ 11