Goodwill and Other Intangible Assets - Components of Goodwill (Details) $ in Millions	9 Months Ended
	Sep. 30, 2022 USD ($)
Goodwill [Roll Forward]
Goodwill, gross, beginning balance	$ 10,675
Accumulated impairment losses, beginning balance	(492)
Goodwill, net, beginning balance	10,183
Goodwill acquired	103
Goodwill disposals	(18)
Foreign exchange	179
Goodwill, gross, ending balance	10,581
Accumulated impairment losses, ending balance	(492)
Goodwill, net, ending balance	10,089
HWC [Member]
Goodwill [Roll Forward]
Goodwill, gross, beginning balance	7,904
Accumulated impairment losses, beginning balance	(130)
Goodwill, net, beginning balance	7,774
Goodwill acquired	0
Goodwill disposals	0
Foreign exchange	62
Goodwill, gross, ending balance	7,842
Accumulated impairment losses, ending balance	(130)
Goodwill, net, ending balance	7,712
R&B [Member]
Goodwill [Roll Forward]
Goodwill, gross, beginning balance	2,771
Accumulated impairment losses, beginning balance	(362)
Goodwill, net, beginning balance	2,409
Goodwill acquired	103
Goodwill disposals	18
Foreign exchange	117
Goodwill, gross, ending balance	2,739
Accumulated impairment losses, ending balance	(362)
Goodwill, net, ending balance	$ 2,377