Goodwill and Intangible Assets - Intangible Assets (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Dec. 31, 2019
Goodwill and Intangible Assets
Gross amount of amortizable intangible assets	$ 27,300	$ 27,600
Accumulated amortization of intangible assets	12,300	11,900
Decrease in intangible assets due to foreign currency translation adjustments	(204)
Estimated annual amortization expense, intangible assets, 2020	2,100
Estimated annual amortization expense, intangible assets, 2021	2,000
Estimated annual amortization expense, intangible assets, 2022	2,000
Estimated annual amortization expense, intangible assets, 2023	2,000
Estimated annual amortization expense, intangible assets, 2024	1,900
Indefinite-lived intangible assets related to in-process R&D acquired in a business combination	$ 1,200	$ 1,300