Cost Reduction Programs and Other Charges - Summary of Activity (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Restructuring Reserve [Roll Forward]
Beginning balance	$ 369	$ 200
Cost reduction programs and other charges	273	506	$ 567
Less: Cash payments	(175)	(221)
Less: Non-cash charges	13	150
Foreign currency translation and other	(27)	34
Ending balance	453	369	200
Merger related and other charges
Restructuring Reserve [Roll Forward]
Beginning balance	64	67
Cost reduction programs and other charges	(65)	115	263
Less: Cash payments	(22)	(45)
Less: Non-cash charges	54	82
Foreign currency translation and other	0	9
Ending balance	31	64	67
Cost Reduction Program
Restructuring Reserve [Roll Forward]
Beginning balance	305	133
Cost reduction programs and other charges	338	391	304
Less: Cash payments	(153)	(176)
Less: Non-cash charges	41	68
Foreign currency translation and other	(27)	25
Ending balance	422	305	133
Cost Reduction Program | Severance costs
Restructuring Reserve [Roll Forward]
Beginning balance	283	117
Cost reduction programs and other charges	259	298	204
Less: Cash payments	(138)	(156)
Less: Non-cash charges	0	0
Foreign currency translation and other	(20)	24
Ending balance	384	283	117
Cost Reduction Program | Other cost reduction charges
Restructuring Reserve [Roll Forward]
Beginning balance	22	16
Cost reduction programs and other charges	79	93	100
Less: Cash payments	(15)	(20)
Less: Non-cash charges	41	68
Foreign currency translation and other	(7)	1
Ending balance	$ 38	$ 22	$ 16