Segments - Pre-Tax Income Reconciliation (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Pre-tax income from continuing operations
Amortization of acquired intangible assets	$ (459)	$ (473)	$ (1,404)	$ (816)
Acquisition-related (charges)/income	(1)	(255)	(3)	(396)
Non-operating retirement-related (costs)/income	(291)	(145)	(829)	(419)
Other - divested businesses	(20)	(25)	(17)	480
Income from continuing operations before income taxes	1,827	1,522	3,348	6,173
Business Segments
Pre-tax income from continuing operations
Income from continuing operations before income taxes	2,962	2,661	6,708	7,938
Internal transactions
Pre-tax income from continuing operations
Income from continuing operations before income taxes	(158)	(84)	(334)	(233)
Unallocated corporate amounts
Pre-tax income from continuing operations
Income from continuing operations before income taxes	$ (206)	$ (157)	$ (773)	$ (380)