Goodwill and Other Intangible Assets (Rollforward of Goodwill) (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended	12 Months Ended
	Dec. 31, 2022	Sep. 30, 2022	Dec. 31, 2021
Goodwill [Roll Forward]
Balance at beginning of year	$ 38,251	$ 41,184	$ 35,420
Reallocation among new reporting units	0
Attributable to acquisitions	230	197	7,235
Attributable to divestitures			(12)
Adjustments due to finalization of purchase price allocations	(2)	18	(11)
Foreign currency translation and other	1,273	(3,148)	(1,448)
Balance at end of year	39,752	38,251	41,184
Goodwill transfers, acquisitions prior to segment reallocation		116
Operating segments | Biotechnology
Goodwill [Roll Forward]
Balance at beginning of year	0	0	0
Reallocation among new reporting units	21,019
Attributable to acquisitions	176	0	0
Attributable to divestitures			0
Adjustments due to finalization of purchase price allocations	0	0	0
Foreign currency translation and other	892	0	0
Balance at end of year	22,087	0	0
Operating segments | Life Sciences
Goodwill [Roll Forward]
Balance at beginning of year	29,145	31,638	25,812
Reallocation among new reporting units	(21,019)
Attributable to acquisitions	43	157	7,077
Attributable to divestitures			0
Adjustments due to finalization of purchase price allocations	(2)	26	(11)
Foreign currency translation and other	147	(2,676)	(1,240)
Balance at end of year	8,314	29,145	31,638
Operating segments | Diagnostics
Goodwill [Roll Forward]
Balance at beginning of year	6,705	7,044	7,082
Reallocation among new reporting units	0
Attributable to acquisitions	13	0	110
Attributable to divestitures			0
Adjustments due to finalization of purchase price allocations	0	(9)	0
Foreign currency translation and other	157	(330)	(148)
Balance at end of year	6,875	6,705	7,044
Operating segments | Environmental & Applied Solutions
Goodwill [Roll Forward]
Balance at beginning of year	2,401	2,502	2,526
Reallocation among new reporting units	0
Attributable to acquisitions	(2)	40	48
Attributable to divestitures			(12)
Adjustments due to finalization of purchase price allocations	0	1	0
Foreign currency translation and other	77	(142)	(60)
Balance at end of year	$ 2,476	$ 2,401	$ 2,502