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Impairment charges / (reversals) (Tables)
12 Months Ended
Dec. 31, 2018
Text block [abstract]  
Summary of Impairment Charges / (Reversals)
Impairment charges/(reversals) comprise:                                    2018         2017             2016  

Impairment charges on financial assets, excluding receivables

              71       70       110  

Impairment reversals on financial assets, excluding receivables

              (39 )      (32 )      (58 ) 

Impairment charges and reversals on non-financial assets and receivables

              46       4       43  

Total

                                78       42       95
Summary of Impairment Charges on Financial Assets, Excluding Receivables
Impairment charges on financial assets, excluding receivables, from:      2018     2017     2016  

Shares

              5       2       1  

Debt securities and money market instruments

              30       17       53  

Loans

              35       50       23  

Other

              -       -       33  

Total

                                71       70       110  
Summary of Impairment Reversals on Financial Assets, Excluding Receivables
Impairment reversals on financial assets, excluding receivables, from:      2018     2017     2016  

Debt securities and money market instruments

              (34 )      (17 )      (42 ) 

Loans

              (3 )      (13 )      (14 ) 

Other

              (2 )      (2 )      (2 ) 

Total

                                (39 )      (32 )      (58 )