Goodwill and other intangible assets (Details Textual) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Goodwill and Intangible Assets Disclosure [Abstract]
Amortization charges associated with finite-lived intangible assets	$ 713	$ 315	$ 1,400	$ 630
Total estimated amortization of finite-lived intangible assets for the six months ending December 31, 2019	1,400		1,400
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