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Goodwill and other intangible assets (Details Textual) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Goodwill and Intangible Assets Disclosure [Abstract]        
Amortization charges associated with finite-lived intangible assets $ 652 $ 713 $ 1,300 $ 1,400
Total estimated amortization of finite-lived intangible assets for the six months ending December 31, 2021 1,200   1,200  
Total estimated amortization of finite-lived intangible assets for 2022 2,500   2,500  
Total estimated amortization of finite-lived intangible assets for 2023 2,400   2,400  
Total estimated amortization of finite-lived intangible assets for 2024 2,400   2,400  
Total estimated amortization of finite-lived intangible assets for 2025 2,200   2,200  
Total estimated amortization of finite-lived intangible assets for 2026 $ 1,800   $ 1,800