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Income taxes - unrecognized tax benefits (Details) - USD ($)
$ in Millions
12 Months Ended
Aug. 31, 2018
Aug. 31, 2017
Aug. 31, 2016
Reconciliation of Unrecognized Tax Benefits      
Balance at beginning of year $ 409 $ 269 $ 261
Gross increases related to tax positions in a prior period 123 151 21
Gross decreases related to tax positions in a prior period (15) (36) (47)
Gross increases related to tax positions in the current period 29 33 68
Settlements with taxing authorities (87) (2) (17)
Currency 0 (1) (11)
Lapse of statute of limitations (3) (5) (6)
Balance at end of year $ 456 $ 409 $ 269