Restructuring and Other Initiatives - Restructuring Reserves and Charges (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024
Restructuring Reserve [Roll Forward]
Restructuring Reserve, Beginning Balance	$ 615	$ 1,151	$ 779	$ 520	$ 650
Additions, interest accretion and other	369	161	781	1,396
Payments	(363)	(661)	(935)	(1,266)
Revisions to estimates and effect of foreign currency	(3)	(2)	(7)	0
Restructuring Reserve, End Balance	$ 617	$ 650	$ 617	$ 650	$ 617