Goodwill and other intangible assets (Details Textual) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Goodwill and Intangible Assets Disclosure [Abstract]
Amortization charges associated with finite-lived intangible assets	$ 708	$ 318	$ 2,100	$ 948
Total estimated amortization of finite-lived intangible assets for the three months ending December 31, 2019	700		700
Total estimated amortization of finite-lived intangible assets for 2020	2,600		2,600
Total estimated amortization of finite-lived intangible assets for 2021	2,500		2,500
Total estimated amortization of finite-lived intangible assets for 2022	2,400		2,400
Total estimated amortization of finite-lived intangible assets for 2023	2,400		2,400
Total estimated amortization of finite-lived intangible assets for 2024	$ 2,200		$ 2,200