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Goodwill and other intangible assets (Details Textual) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2018
Goodwill and Intangible Assets Disclosure [Abstract]      
Amortization charges associated with finite-lived intangible assets $ 315 $ 332 $ 652
Total estimated amortization of finite-lived intangible assets for the six months ending December 31, 2019 600    
Total estimated amortization of finite-lived intangible assets for 2020 1,200    
Total estimated amortization of finite-lived intangible assets for 2021 1,000    
Total estimated amortization of finite-lived intangible assets for 2022 900    
Total estimated amortization of finite-lived intangible assets for 2023 900    
Total estimated amortization of finite-lived intangible assets for 2024 $ 800