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Goodwill and intangible assets (Goodwill Roll Forward) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2016
Goodwill [Roll Forward]    
Beginning balance $ 14,761 $ 14,751
Addition from K-A acquisition 6 0
Currency translation adjustments (68) 10
Ending balance $ 14,699 $ 14,761