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Goodwill and other intangible assets (Details Textual) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]    
Amortization charges associated with finite-lived intangible assets $ 315 $ 320
Total estimated amortization of finite-lived intangible assets for the nine months ending December 31, 2019 1,000  
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