Goodwill and Intangible Assets - Intangible Assets (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2020	Dec. 31, 2019
Goodwill and Intangible Assets
Gross amount of amortizable intangible assets	$ 27,500	$ 27,500	$ 27,600
Accumulated amortization of intangible assets	13,500	13,500	11,900
Decrease in intangible assets due to foreign currency translation adjustments		(69)
Estimated annual amortization expense, intangible assets, 2020	2,100	2,100
Estimated annual amortization expense, intangible assets, 2021	2,000	2,000
Estimated annual amortization expense, intangible assets, 2022	2,000	2,000
Estimated annual amortization expense, intangible assets, 2023	2,000	2,000
Estimated annual amortization expense, intangible assets, 2024	1,900	1,900
Indefinite-lived intangible assets related to in-process R&D acquired in a business combination	1,200	1,200	$ 1,300
Medical Devices
Goodwill and Intangible Assets
Impairment of amortizable intangible assets	$ 148	$ 148