Goodwill And Other Intangible Assets (Goodwill by Segment) (Details) - USD ($) $ in Millions	Oct. 01, 2021	Dec. 31, 2020
Goodwill [Line Items]
Total goodwill	$ 41,237	$ 35,420
Operating segments | Life Sciences
Goodwill [Line Items]
Total goodwill	31,755	25,812
Operating segments | Diagnostics
Goodwill [Line Items]
Total goodwill	6,974	7,082
Operating segments | Environmental & Applied Solutions
Goodwill [Line Items]
Total goodwill	$ 2,508	$ 2,526