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Impairment charges - Reconciliation of impairment charges (Details) - AUD ($)
$ in Millions
12 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2015
Impairment charges          
Write-backs   $ (150) $ (288)    
Recoveries $ (172) (179) (168) $ (137) $ (131)
Impairment charges [1] 794 710 853    
Individually assessed          
Impairment charges          
Provisions raised   371 610    
Collectively assessed          
Impairment charges          
Provisions raised   668 699    
Performing          
Impairment charges          
Provisions raised (209)        
Non-performing          
Impairment charges          
Provisions raised 1,175        
Credit commitments          
Impairment charges          
Impairment charges 794        
Debt securities | FVOCI          
Impairment charges          
Impairment charges   0 0    
Debt securities | Amortised cost          
Impairment charges          
Impairment charges   0 0    
Due from subsidiaries          
Impairment charges          
Impairment charges   0 $ 0    
Parent Entity          
Impairment charges          
Write-backs   (131)      
Recoveries (143) (138)      
Impairment charges [1] 750 682      
Parent Entity | Individually assessed          
Impairment charges          
Provisions raised   341      
Parent Entity | Collectively assessed          
Impairment charges          
Provisions raised   $ 610      
Parent Entity | Performing          
Impairment charges          
Provisions raised (180)        
Parent Entity | Non-performing          
Impairment charges          
Provisions raised 1,073        
Parent Entity | Credit commitments          
Impairment charges          
Impairment charges $ 750        
[1] The Group has adopted AASB 9 and AASB 15 from 1 October 2018. Comparatives have not been restated. In addition, the Group has made a number of presentational changes to the Balance Sheet and Income Statement. Comparatives have been restated. Refer to Note 1 for further detail.