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Segment reporting - geographic data (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Aug. 31, 2017
May 31, 2017
Feb. 28, 2017
Nov. 30, 2016
Aug. 31, 2016
May 31, 2016
Feb. 29, 2016
Nov. 30, 2015
Aug. 31, 2017
Aug. 31, 2016
Aug. 31, 2015
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Sales $ 30,149 $ 30,118 $ 29,446 $ 28,501 $ 28,636 $ 29,498 $ 30,184 $ 29,033 $ 118,214 $ 117,351 $ 103,444
Long-Lived Assets 13,642       14,335       13,642 14,335  
Other                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Sales                 2,136 2,675 1,833
Long-Lived Assets 180       175       180 175  
Reportable Geographical Components | United States of America                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Sales                 87,302 83,802 80,974
Long-Lived Assets 10,344       10,924       10,344 10,924  
Reportable Geographical Components | United Kingdom                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Sales                 12,552 14,081 9,235
Long-Lived Assets 2,502       2,611       2,502 2,611  
Reportable Geographical Components | Europe (excluding the United Kingdom)                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Sales                 16,224 16,793 $ 11,402
Long-Lived Assets $ 616       $ 625       $ 616 $ 625