Goodwill and other intangible assets - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Goodwill and Intangible Assets Disclosure [Abstract]
Amortization charges associated with finite-lived intangible assets	$ 1,200	$ 693	$ 3,600	$ 2,100
Total estimated amortization of finite-lived intangible assets for the remainder of the year	1,200		1,200
Total estimated amortization of finite-lived intangible assets for 2025	4,500		4,500
Total estimated amortization of finite-lived intangible assets for 2026	3,900		3,900
Total estimated amortization of finite-lived intangible assets for 2027	3,900		3,900
Total estimated amortization of finite-lived intangible assets for 2028	2,900		2,900
Total estimated amortization of finite-lived intangible assets for 2029	$ 2,200		$ 2,200