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Goodwill and other intangible assets (Details Textual) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Goodwill and Intangible Assets Disclosure [Abstract]        
Amortization charges associated with finite-lived intangible assets $ 371 $ 371 $ 744 $ 740
Total estimated amortization of finite-lived intangible assets for the six months ending December 31, 2017 600   600  
Total estimated amortization of finite-lived intangible assets for 2018 1,200   1,200  
Total estimated amortization of finite-lived intangible assets for 2019 1,100   1,100  
Total estimated amortization of finite-lived intangible assets for 2020 1,100   1,100  
Total estimated amortization of finite-lived intangible assets for 2021 900   900  
Total estimated amortization of finite-lived intangible assets for 2022 $ 900   $ 900