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Goodwill and other intangible assets (Goodwill Roll Forward) (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Goodwill [Roll Forward]    
Beginning balance $ 14,751 $ 14,787
Goodwill related to acquisitions of businesses 0 2
Currency translation adjustments 25 13
Ending balance $ 14,776 $ 14,802