Goodwill and Other Intangible Assets - Components of Goodwill (Details) $ in Millions	6 Months Ended
	Jun. 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	97
Goodwill disposals	(18)
Foreign exchange	(104)
Goodwill, gross, ending balance	10,650
Accumulated impairment losses, ending balance	(492)
Goodwill, net, ending balance	10,158
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	(35)
Goodwill, gross, ending balance	7,869
Accumulated impairment losses, ending balance	(130)
Goodwill, net, ending balance	7,739
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	97
Goodwill disposals	(18)
Foreign exchange	(69)
Goodwill, gross, ending balance	2,781
Accumulated impairment losses, ending balance	(362)
Goodwill, net, ending balance	$ 2,419