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Retirement benefits - change in plan assets (Details) - Pension Plan - USD ($)
$ in Millions
12 Months Ended
Aug. 31, 2018
Aug. 31, 2017
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]    
Plan assets at fair value at beginning of year $ 8,980 $ 9,428
Employer contributions 65 70
Benefits paid (398) (298)
Return on assets/other (55) (52)
Currency translation adjustments 84 (168)
Plan assets at fair value at end of year $ 8,676 $ 8,980