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Investment gains/losses - Narrative (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Feb. 29, 2016
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Gain (Loss) on Investments [Line Items]          
Investment gains/losses   $ 290 $ 643 $ 605 $ 2,493
Duracell Company [Member] | Common Stock [Member] | Procter & Gamble Company [Member]          
Gain (Loss) on Investments [Line Items]          
Investment gains/losses $ 1,100       $ 1,100
Kraft Heinz (previously Heinz Holding) [Member] | Cumulative Compounding Preferred Stock [Member]          
Gain (Loss) on Investments [Line Items]          
Investment gains/losses     $ 610