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Goodwill and other intangible assets (Details Textual) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Goodwill and Intangible Assets Disclosure [Abstract]        
Amortization charges associated with finite-lived intangible assets $ 332 $ 371 $ 652 $ 744
Total estimated amortization of finite-lived intangible assets for the six months ending December 31, 2018 700   700  
Total estimated amortization of finite-lived intangible assets for 2019 1,300   1,300  
Total estimated amortization of finite-lived intangible assets for 2020 1,200   1,200  
Total estimated amortization of finite-lived intangible assets for 2021 1,000   1,000  
Total estimated amortization of finite-lived intangible assets for 2022 900   900  
Total estimated amortization of finite-lived intangible assets for 2023 $ 900   $ 900