Goodwill and Other Intangible Assets - Components of Goodwill (Details) $ in Millions	3 Months Ended
	Mar. 31, 2025 USD ($)
Goodwill [Roll Forward]
Goodwill, gross, beginning balance	$ 10,072
Accumulated impairment losses, beginning balance	(1,273)
Goodwill, net, beginning balance	8,799
Foreign exchange	42
Goodwill, gross, ending balance	10,114
Accumulated impairment losses, ending balance	(1,273)
Goodwill, net, ending balance	8,841
HWC [Member]
Goodwill [Roll Forward]
Goodwill, gross, beginning balance	7,276
Accumulated impairment losses, beginning balance	(911)
Goodwill, net, beginning balance	6,365
Foreign exchange	15
Goodwill, gross, ending balance	7,291
Accumulated impairment losses, ending balance	(911)
Goodwill, net, ending balance	6,380
R&B [Member]
Goodwill [Roll Forward]
Goodwill, gross, beginning balance	2,796
Accumulated impairment losses, beginning balance	(362)
Goodwill, net, beginning balance	2,434
Foreign exchange	27
Goodwill, gross, ending balance	2,823
Accumulated impairment losses, ending balance	(362)
Goodwill, net, ending balance	$ 2,461