Goodwill and Other Intangible Assets - Components of Goodwill (Details) $ in Millions	3 Months Ended
	Mar. 31, 2024 USD ($)
Goodwill [Roll Forward]
Goodwill, gross, beginning balance	$ 10,687
Accumulated impairment losses, beginning balance	(492)
Goodwill, net, beginning balance	10,195
Goodwill acquired	18
Foreign exchange	(27)
Goodwill, gross, ending balance	10,678
Accumulated impairment losses, ending balance	(492)
Goodwill, net, ending balance	10,186
HWC [Member]
Goodwill [Roll Forward]
Goodwill, gross, beginning balance	7,866
Accumulated impairment losses, beginning balance	(130)
Goodwill, net, beginning balance	7,736
Goodwill acquired	18
Foreign exchange	(8)
Goodwill, gross, ending balance	7,876
Accumulated impairment losses, ending balance	(130)
Goodwill, net, ending balance	7,746
R&B [Member]
Goodwill [Roll Forward]
Goodwill, gross, beginning balance	2,821
Accumulated impairment losses, beginning balance	(362)
Goodwill, net, beginning balance	2,459
Goodwill acquired	0
Foreign exchange	(19)
Goodwill, gross, ending balance	2,802
Accumulated impairment losses, ending balance	(362)
Goodwill, net, ending balance	$ 2,440