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New Standards and Interpretations Adopted in the Current Year - Summary of financial assets classified into appropriate IFRS 9 categories (Detail)
$ in Millions
Jan. 01, 2018
USD ($)
Disclosure Of Financial Instruments [Line Items]  
Reclassifcation of money market funds from amortised cost to FVPL $ 1,300
Revaluation of funds 1
Opening balance – IFRS 9 (including expected credit losses and revaluation of funds) 15,282
IAS 39 [member]  
Disclosure Of Financial Instruments [Line Items]  
Financial Assets 15,288
IFRS 9 [member]  
Disclosure Of Financial Instruments [Line Items]  
Financial Assets 15,288
Impairment provision resulting from the application of the ECL model (7)
IFRS 9 [member] | IFRS 9 Classification Amortised Cost  
Disclosure Of Financial Instruments [Line Items]  
Financial Assets 10,707
IFRS 9 [member] | IFRS 9 Classification Amortised Cost  
Disclosure Of Financial Instruments [Line Items]  
Financial Assets 46
IFRS 9 [member] | IFRS 9 Classification Amortised Cost  
Disclosure Of Financial Instruments [Line Items]  
Financial Assets 4,535
IAS 39 Classification Loans Receivable Held To Maturity | IAS 39 [member]  
Disclosure Of Financial Instruments [Line Items]  
Financial Assets 1,482
IAS 39 Classification Loans Receivable Held To Maturity | Other Investment Including Loans | IFRS 9 Classification Amortised Cost  
Disclosure Of Financial Instruments [Line Items]  
Reclassification of a financial asset from held to maturity to FVPL 6
IAS 39 Classification Loans Receivable Held To Maturity | Cash and cash equivalents [member] | IFRS 9 Classification Amortised Cost  
Disclosure Of Financial Instruments [Line Items]  
Reclassifcation of money market funds from amortised cost to FVPL 7,813
IAS 39 Classification Loans Receivable Held To Maturity | Trade And Other Receivable | IFRS 9 Classification Amortised Cost  
Disclosure Of Financial Instruments [Line Items]  
Reclassifcation of money market funds from amortised cost to FVPL 1,316
IAS 39 Classification Loans Receivable Held To Maturity | Investments In Equity Shares And Funds | IFRS 9 Classification Amortised Cost  
Disclosure Of Financial Instruments [Line Items]  
Reclassifcation of money market funds from amortised cost to FVPL 90
IAS 39 Classification Loans Receivable Held To Maturity | IAS 39 [member]  
Disclosure Of Financial Instruments [Line Items]  
Financial Assets 136
IAS 39 Classification Loans Receivable Held To Maturity | Investments In Equity Shares And Funds | IFRS 9 Classification Amortised Cost  
Disclosure Of Financial Instruments [Line Items]  
Reclassifcation of money market funds from amortised cost to FVPL (90)
IAS 39 Classification Loans Receivable Held To Maturity | IAS 39 [member]  
Disclosure Of Financial Instruments [Line Items]  
Financial Assets 13,670
IAS 39 Classification Loans Receivable Held To Maturity | Other Investment Including Loans | IFRS 9 Classification Amortised Cost  
Disclosure Of Financial Instruments [Line Items]  
Reclassification of a financial asset from held to maturity to FVPL (6)
IAS 39 Classification Loans Receivable Held To Maturity | Cash and cash equivalents [member] | IFRS 9 Classification Amortised Cost  
Disclosure Of Financial Instruments [Line Items]  
Reclassifcation of money market funds from amortised cost to FVPL (7,813)
IAS 39 Classification Loans Receivable Held To Maturity | Trade And Other Receivable | IFRS 9 Classification Amortised Cost  
Disclosure Of Financial Instruments [Line Items]  
Reclassifcation of money market funds from amortised cost to FVPL $ (1,316)