Goodwill and Other Intangible Assets - Components of Goodwill (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Goodwill [Roll Forward]
Goodwill, gross, beginning balance	$ 10,665	$ 10,675
Accumulated impairment losses, beginning balance	(492)	(492)
Goodwill, net, beginning balance	10,173	10,183
Goodwill acquired		104
Goodwill disposals	(21)	(18)
Foreign exchange	43	(96)
Goodwill, gross, ending balance	10,687	10,665
Accumulated impairment losses, ending balance	(492)	(492)
Goodwill, net, ending balance	10,195	10,173
HWC [Member]
Goodwill [Roll Forward]
Goodwill, gross, beginning balance	7,870	7,904
Accumulated impairment losses, beginning balance	(130)	(130)
Goodwill, net, beginning balance	7,740	7,774
Goodwill acquired		0
Goodwill disposals	(21)	0
Foreign exchange	17	(34)
Goodwill, gross, ending balance	7,866	7,870
Accumulated impairment losses, ending balance	(130)	(130)
Goodwill, net, ending balance	7,736	7,740
R&B [Member]
Goodwill [Roll Forward]
Goodwill, gross, beginning balance	2,795	2,771
Accumulated impairment losses, beginning balance	(362)	(362)
Goodwill, net, beginning balance	2,433	2,409
Goodwill acquired		104
Goodwill disposals	0	(18)
Foreign exchange	26	(62)
Goodwill, gross, ending balance	2,821	2,795
Accumulated impairment losses, ending balance	(362)	(362)
Goodwill, net, ending balance	$ 2,459	$ 2,433