XML 77 R64.htm IDEA: XBRL DOCUMENT v3.5.0.2
Income taxes - Narrative (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Feb. 29, 2016
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Income Taxes [Line Items]          
Effective income tax rate   30.30% 32.30% 25.80% 31.60%
Investment gains/losses   $ 3,150 $ 8,266 $ 5,643 $ 8,725
Common Stock [Member] | Procter & Gamble Company [Member] | Duracell Company [Member]          
Income Taxes [Line Items]          
Investment gains/losses $ 1,100     1,100  
Reduction of certain deferred income tax liabilities       $ 750  
Effective income tax rate reduction related to exchange of investment securities       4.70%