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Effects of reclassification upon adoption of IFRS 9 - Footnotes (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Jan. 01, 2018
Disclosure Of Effects Of Initial Application Of IFRS 9 [Line Items]        
Decrease to net assets including ECL upon initial adoption of IFRS 9   $ 2,232    
IFRS 9 re-measurement including expected credit losses   (3,341)    
IFRS 9 remeasurement including expected credit losses   (1,694)    
Carrying amount post reclassification   2,521,771    
Trading income (expense) $ 9,531 8,426 $ 7,521  
Tax expense $ 4,865 5,288 $ 3,666  
IFRS 9 remeasurement   1,647    
IFRS 9 remeasurement attributable to expected credit losses   184    
Fair value through profit and loss        
Disclosure Of Effects Of Initial Application Of IFRS 9 [Line Items]        
IFRS 9 reclassifications and other changes in classification   0    
IFRS 9 reclassifications and other changes in classifications   0    
Amortised cost        
Disclosure Of Effects Of Initial Application Of IFRS 9 [Line Items]        
IFRS 9 reclassifications and other changes in classification   0    
IFRS 9 reclassifications and other changes in classifications   0    
Fair value through other comprehensive income        
Disclosure Of Effects Of Initial Application Of IFRS 9 [Line Items]        
IFRS 9 reclassifications and other changes in classification   0    
IFRS 9 reclassifications and other changes in classifications   0    
Other changes in classification        
Disclosure Of Effects Of Initial Application Of IFRS 9 [Line Items]        
IFRS 9 reclassifications and other changes in classification   0    
IFRS 9 reclassifications and other changes in classifications   0    
Other reserves        
Disclosure Of Effects Of Initial Application Of IFRS 9 [Line Items]        
IFRS 9 remeasurement   61    
Financial liabilities designated at fair value        
Disclosure Of Effects Of Initial Application Of IFRS 9 [Line Items]        
Decrease in financial liabilities voluntarily reclassified upon initial application of IFRS 9   7,110    
IFRS 9 remeasurement including expected credit losses   9    
Financial liabilities designated at fair value | Fair value through profit and loss        
Disclosure Of Effects Of Initial Application Of IFRS 9 [Line Items]        
IFRS 9 reclassifications and other changes in classifications   0    
Financial liabilities designated at fair value | Amortised cost        
Disclosure Of Effects Of Initial Application Of IFRS 9 [Line Items]        
IFRS 9 reclassifications and other changes in classifications   (9,699)    
Financial liabilities designated at fair value | Fair value through other comprehensive income        
Disclosure Of Effects Of Initial Application Of IFRS 9 [Line Items]        
IFRS 9 reclassifications and other changes in classifications   0    
Financial liabilities designated at fair value | Other changes in classification        
Disclosure Of Effects Of Initial Application Of IFRS 9 [Line Items]        
IFRS 9 reclassifications and other changes in classifications   59,267    
Trading liabilities        
Disclosure Of Effects Of Initial Application Of IFRS 9 [Line Items]        
IFRS 9 remeasurement including expected credit losses   0    
Trading liabilities | Fair value through profit and loss        
Disclosure Of Effects Of Initial Application Of IFRS 9 [Line Items]        
IFRS 9 reclassifications and other changes in classifications   0    
Trading liabilities | Amortised cost        
Disclosure Of Effects Of Initial Application Of IFRS 9 [Line Items]        
IFRS 9 reclassifications and other changes in classifications   0    
Trading liabilities | Fair value through other comprehensive income        
Disclosure Of Effects Of Initial Application Of IFRS 9 [Line Items]        
IFRS 9 reclassifications and other changes in classifications   0    
Trading liabilities | Other changes in classification        
Disclosure Of Effects Of Initial Application Of IFRS 9 [Line Items]        
IFRS 9 reclassifications and other changes in classifications   (103,497)    
Trading liabilities        
Disclosure Of Effects Of Initial Application Of IFRS 9 [Line Items]        
Financial liabilities reclassified voluntarily, initial application of IFRS 9   44,230    
Deposits by banks        
Disclosure Of Effects Of Initial Application Of IFRS 9 [Line Items]        
Financial liabilities reclassified voluntarily, initial application of IFRS 9   5,430    
Customer accounts        
Disclosure Of Effects Of Initial Application Of IFRS 9 [Line Items]        
Financial liabilities reclassified voluntarily, initial application of IFRS 9   4,235    
IFRS 9 remeasurement including expected credit losses   0    
Customer accounts | Fair value through profit and loss        
Disclosure Of Effects Of Initial Application Of IFRS 9 [Line Items]        
IFRS 9 reclassifications and other changes in classifications   0    
Customer accounts | Amortised cost        
Disclosure Of Effects Of Initial Application Of IFRS 9 [Line Items]        
IFRS 9 reclassifications and other changes in classifications   0    
Customer accounts | Fair value through other comprehensive income        
Disclosure Of Effects Of Initial Application Of IFRS 9 [Line Items]        
IFRS 9 reclassifications and other changes in classifications   0    
Customer accounts | Other changes in classification        
Disclosure Of Effects Of Initial Application Of IFRS 9 [Line Items]        
IFRS 9 reclassifications and other changes in classifications   (4,235)    
Provisions        
Disclosure Of Effects Of Initial Application Of IFRS 9 [Line Items]        
IFRS 9 remeasurement including expected credit losses   284    
Provisions | Fair value through profit and loss        
Disclosure Of Effects Of Initial Application Of IFRS 9 [Line Items]        
IFRS 9 reclassifications and other changes in classifications   0    
Provisions | Amortised cost        
Disclosure Of Effects Of Initial Application Of IFRS 9 [Line Items]        
IFRS 9 reclassifications and other changes in classifications   0    
Provisions | Fair value through other comprehensive income        
Disclosure Of Effects Of Initial Application Of IFRS 9 [Line Items]        
IFRS 9 reclassifications and other changes in classifications   0    
Provisions | Other changes in classification        
Disclosure Of Effects Of Initial Application Of IFRS 9 [Line Items]        
IFRS 9 reclassifications and other changes in classifications   0    
Liabilities under insurance contracts        
Disclosure Of Effects Of Initial Application Of IFRS 9 [Line Items]        
IFRS 9 reclassifications and other changes in classifications   (69)    
Subordinated liabilities        
Disclosure Of Effects Of Initial Application Of IFRS 9 [Line Items]        
IFRS 9 remeasurement including expected credit losses   (1,445)    
Increase (decrease) in financial liabilities designated at amortised cost upon initial application of IFRS 9   $ 370    
Subordinated liabilities | 3.16% Subordinated Debt        
Disclosure Of Effects Of Initial Application Of IFRS 9 [Line Items]        
Effective interest rate determined on date of reclassification of financial liabilities out of fair value through profit or loss category, initial application of IFRS 9   3.16%    
Subordinated liabilities | 5.34% Subordinated Debt        
Disclosure Of Effects Of Initial Application Of IFRS 9 [Line Items]        
Effective interest rate determined on date of reclassification of financial liabilities out of fair value through profit or loss category, initial application of IFRS 9   5.34%    
Subordinated liabilities | 6.57% Subordinated Debt        
Disclosure Of Effects Of Initial Application Of IFRS 9 [Line Items]        
Effective interest rate determined on date of reclassification of financial liabilities out of fair value through profit or loss category, initial application of IFRS 9   6.57%    
Subordinated liabilities | 7.69% Subordinated Debt        
Disclosure Of Effects Of Initial Application Of IFRS 9 [Line Items]        
Effective interest rate determined on date of reclassification of financial liabilities out of fair value through profit or loss category, initial application of IFRS 9   7.69%    
Subordinated liabilities | Fair value through profit and loss        
Disclosure Of Effects Of Initial Application Of IFRS 9 [Line Items]        
IFRS 9 reclassifications and other changes in classifications   $ 0    
Subordinated liabilities | Amortised cost        
Disclosure Of Effects Of Initial Application Of IFRS 9 [Line Items]        
IFRS 9 reclassifications and other changes in classifications   7,480    
Subordinated liabilities | Fair value through other comprehensive income        
Disclosure Of Effects Of Initial Application Of IFRS 9 [Line Items]        
IFRS 9 reclassifications and other changes in classifications   0    
Subordinated liabilities | Other changes in classification        
Disclosure Of Effects Of Initial Application Of IFRS 9 [Line Items]        
IFRS 9 reclassifications and other changes in classifications   0    
Debt securities in issue        
Disclosure Of Effects Of Initial Application Of IFRS 9 [Line Items]        
IFRS 9 remeasurement including expected credit losses   $ (105)    
Effective interest rate determined on date of reclassification of financial liabilities out of fair value through profit or loss category, initial application of IFRS 9   4.05%    
Debt securities in issue | Fair value through profit and loss        
Disclosure Of Effects Of Initial Application Of IFRS 9 [Line Items]        
IFRS 9 reclassifications and other changes in classifications   $ 0    
Debt securities in issue | Amortised cost        
Disclosure Of Effects Of Initial Application Of IFRS 9 [Line Items]        
IFRS 9 reclassifications and other changes in classifications   2,095    
Debt securities in issue | Fair value through other comprehensive income        
Disclosure Of Effects Of Initial Application Of IFRS 9 [Line Items]        
IFRS 9 reclassifications and other changes in classifications   0    
Debt securities in issue | Other changes in classification        
Disclosure Of Effects Of Initial Application Of IFRS 9 [Line Items]        
IFRS 9 reclassifications and other changes in classifications   0    
Accruals, deferred income and other liabilities        
Disclosure Of Effects Of Initial Application Of IFRS 9 [Line Items]        
IFRS 9 remeasurement including expected credit losses   0    
Accruals, deferred income and other liabilities | Fair value through profit and loss        
Disclosure Of Effects Of Initial Application Of IFRS 9 [Line Items]        
IFRS 9 reclassifications and other changes in classifications   0    
Accruals, deferred income and other liabilities | Amortised cost        
Disclosure Of Effects Of Initial Application Of IFRS 9 [Line Items]        
IFRS 9 reclassifications and other changes in classifications   124    
Accruals, deferred income and other liabilities | Fair value through other comprehensive income        
Disclosure Of Effects Of Initial Application Of IFRS 9 [Line Items]        
IFRS 9 reclassifications and other changes in classifications   0    
Accruals, deferred income and other liabilities | Other changes in classification        
Disclosure Of Effects Of Initial Application Of IFRS 9 [Line Items]        
IFRS 9 reclassifications and other changes in classifications   53,895    
Trading assets        
Disclosure Of Effects Of Initial Application Of IFRS 9 [Line Items]        
Financial assets reclassified voluntarily, initial application of IFRS 9   37,900    
Loans and advances to banks        
Disclosure Of Effects Of Initial Application Of IFRS 9 [Line Items]        
Financial assets reclassified voluntarily, initial application of IFRS 9   5,939    
Increase (decrease) in financial assets designated at fair value through profit or loss reclassified upon initial application of IFRS 9   (712)    
Loans and advances to customers        
Disclosure Of Effects Of Initial Application Of IFRS 9 [Line Items]        
Financial assets reclassified voluntarily, initial application of IFRS 9   3,976    
Increase (decrease) in financial assets designated at fair value through profit or loss reclassified upon initial application of IFRS 9   (3,903)    
Loans and advances to customers and banks        
Disclosure Of Effects Of Initial Application Of IFRS 9 [Line Items]        
Financial assets reclassified voluntarily, initial application of IFRS 9   4,642    
Loans and advances to customers        
Disclosure Of Effects Of Initial Application Of IFRS 9 [Line Items]        
IFRS 9 re-measurement including expected credit losses   (1,890)    
Carrying amount post reclassification   951,627    
Loans and advances to customers | Fair value through profit and loss        
Disclosure Of Effects Of Initial Application Of IFRS 9 [Line Items]        
IFRS 9 reclassifications and other changes in classification   3,903    
Loans and advances to customers | Amortised cost        
Disclosure Of Effects Of Initial Application Of IFRS 9 [Line Items]        
IFRS 9 reclassifications and other changes in classification   (24)    
Loans and advances to customers | Fair value through other comprehensive income        
Disclosure Of Effects Of Initial Application Of IFRS 9 [Line Items]        
IFRS 9 reclassifications and other changes in classification   0    
Loans and advances to customers | Other changes in classification        
Disclosure Of Effects Of Initial Application Of IFRS 9 [Line Items]        
IFRS 9 reclassifications and other changes in classification   7,458    
Debt instruments | Available-for-sale        
Disclosure Of Effects Of Initial Application Of IFRS 9 [Line Items]        
IFRS 9 re-measurement including expected credit losses   (3)    
Increase (decrease) in financial asset measured at amortised cost excluding ECL upon initial application of IFRS 9   441    
Carrying amount post reclassification   322,166    
Debt instruments | Available-for-sale | Fair value through profit and loss        
Disclosure Of Effects Of Initial Application Of IFRS 9 [Line Items]        
IFRS 9 reclassifications and other changes in classification   3,131    
Debt instruments | Available-for-sale | Amortised cost        
Disclosure Of Effects Of Initial Application Of IFRS 9 [Line Items]        
IFRS 9 reclassifications and other changes in classification   7,026    
Debt instruments | Available-for-sale | Fair value through other comprehensive income        
Disclosure Of Effects Of Initial Application Of IFRS 9 [Line Items]        
IFRS 9 reclassifications and other changes in classification   (83)    
Debt instruments | Available-for-sale | Other changes in classification        
Disclosure Of Effects Of Initial Application Of IFRS 9 [Line Items]        
IFRS 9 reclassifications and other changes in classification   0    
Equity securities | Available-for-sale        
Disclosure Of Effects Of Initial Application Of IFRS 9 [Line Items]        
IFRS 9 re-measurement including expected credit losses   0    
Carrying amount post reclassification   1,813    
Equity securities | Available-for-sale | Fair value through profit and loss        
Disclosure Of Effects Of Initial Application Of IFRS 9 [Line Items]        
IFRS 9 reclassifications and other changes in classification   2,104    
Equity securities | Available-for-sale | Amortised cost        
Disclosure Of Effects Of Initial Application Of IFRS 9 [Line Items]        
IFRS 9 reclassifications and other changes in classification   0    
Equity securities | Available-for-sale | Fair value through other comprehensive income        
Disclosure Of Effects Of Initial Application Of IFRS 9 [Line Items]        
IFRS 9 reclassifications and other changes in classification   0    
Equity securities | Available-for-sale | Other changes in classification        
Disclosure Of Effects Of Initial Application Of IFRS 9 [Line Items]        
IFRS 9 reclassifications and other changes in classification   0    
Prepayments, accrued income and other assets        
Disclosure Of Effects Of Initial Application Of IFRS 9 [Line Items]        
IFRS 9 re-measurement including expected credit losses   (15)    
Carrying amount post reclassification   114,792    
Prepayments, accrued income and other assets | Fair value through profit and loss        
Disclosure Of Effects Of Initial Application Of IFRS 9 [Line Items]        
IFRS 9 reclassifications and other changes in classification   214    
Prepayments, accrued income and other assets | Amortised cost        
Disclosure Of Effects Of Initial Application Of IFRS 9 [Line Items]        
IFRS 9 reclassifications and other changes in classification   (37,900)    
Prepayments, accrued income and other assets | Fair value through other comprehensive income        
Disclosure Of Effects Of Initial Application Of IFRS 9 [Line Items]        
IFRS 9 reclassifications and other changes in classification   0    
Prepayments, accrued income and other assets | Other changes in classification        
Disclosure Of Effects Of Initial Application Of IFRS 9 [Line Items]        
IFRS 9 reclassifications and other changes in classification   (9,915)    
Interests in associates and joint ventures        
Disclosure Of Effects Of Initial Application Of IFRS 9 [Line Items]        
IFRS 9 re-measurement including expected credit losses   (942)   $ (942)
Carrying amount post reclassification   22,744    
Interests in associates and joint ventures | Fair value through profit and loss        
Disclosure Of Effects Of Initial Application Of IFRS 9 [Line Items]        
IFRS 9 reclassifications and other changes in classification   0    
Interests in associates and joint ventures | Amortised cost        
Disclosure Of Effects Of Initial Application Of IFRS 9 [Line Items]        
IFRS 9 reclassifications and other changes in classification   0    
Interests in associates and joint ventures | Fair value through other comprehensive income        
Disclosure Of Effects Of Initial Application Of IFRS 9 [Line Items]        
IFRS 9 reclassifications and other changes in classification   0    
Interests in associates and joint ventures | Other changes in classification        
Disclosure Of Effects Of Initial Application Of IFRS 9 [Line Items]        
IFRS 9 reclassifications and other changes in classification   0    
Goodwill and intangible assets        
Disclosure Of Effects Of Initial Application Of IFRS 9 [Line Items]        
IFRS 9 re-measurement including expected credit losses   (79)    
Carrying amount post reclassification   23,453    
Goodwill and intangible assets | Fair value through profit and loss        
Disclosure Of Effects Of Initial Application Of IFRS 9 [Line Items]        
IFRS 9 reclassifications and other changes in classification   0    
Goodwill and intangible assets | Amortised cost        
Disclosure Of Effects Of Initial Application Of IFRS 9 [Line Items]        
IFRS 9 reclassifications and other changes in classification   0    
Goodwill and intangible assets | Fair value through other comprehensive income        
Disclosure Of Effects Of Initial Application Of IFRS 9 [Line Items]        
IFRS 9 reclassifications and other changes in classification   0    
Goodwill and intangible assets | Other changes in classification        
Disclosure Of Effects Of Initial Application Of IFRS 9 [Line Items]        
IFRS 9 reclassifications and other changes in classification   0    
Pro Forma | Change in accounting policy and presentation        
Disclosure Of Effects Of Initial Application Of IFRS 9 [Line Items]        
Trading income (expense)   545    
Tax expense   $ 168