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Consolidated statement of changes in equity (Parenthetical) - AUD ($)
$ in Millions
6 Months Ended
Mar. 31, 2021
Sep. 30, 2020
Mar. 31, 2020
Consolidated statement of changes in equity      
Final dividend (in dollars per share) $ 0.31   $ 0.80
Final dividend $ 1,120   $ 2,791
Interim dividend   $ 0  
Dividend tax rate (as a percent) 30.00% 30.00% 30.00%