Goodwill and Other Intangible Assets - Components of Goodwill (Details) $ in Millions	9 Months Ended
	Sep. 30, 2025 USD ($)
Goodwill [Roll Forward]
Goodwill, gross, beginning balance	$ 10,072
Accumulated impairment losses, beginning balance	(1,273)
Goodwill, net, beginning balance	8,799
Goodwill acquired	9
Foreign exchange	128
Goodwill, gross, ending balance	10,209
Accumulated impairment losses, ending balance	(1,273)
Goodwill, net, ending balance	8,936
HWC [Member]
Goodwill [Roll Forward]
Goodwill, gross, beginning balance	7,276
Accumulated impairment losses, beginning balance	(911)
Goodwill, net, beginning balance	6,365
Goodwill acquired	0
Foreign exchange	41
Goodwill, gross, ending balance	7,317
Accumulated impairment losses, ending balance	(911)
Goodwill, net, ending balance	6,406
R&B [Member]
Goodwill [Roll Forward]
Goodwill, gross, beginning balance	2,796
Accumulated impairment losses, beginning balance	(362)
Goodwill, net, beginning balance	2,434
Goodwill acquired	9
Foreign exchange	87
Goodwill, gross, ending balance	2,892
Accumulated impairment losses, ending balance	(362)
Goodwill, net, ending balance	$ 2,530