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Cost Reduction Programs and Other Charges - Summary of Activity (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Restructuring Cost and Reserve [Line Items]
Cost reduction programs and other charges	$ 506	$ 567	$ 309
Less: Cash payments	(221)	(260)
Less: Non-cash charges	(150)	(99)
Foreign currency translation and other	34	(8)
Balance, December 31, 2020	369	200
Severance costs
Restructuring Cost and Reserve [Line Items]
Cost reduction programs and other charges	298	204
Other cost reduction charges
Restructuring Cost and Reserve [Line Items]
Cost reduction programs and other charges	93	100
Merger related and other charges
Restructuring Cost and Reserve [Line Items]
Cost reduction programs and other charges	115	263
Less: Cash payments	(45)	(112)
Less: Non-cash charges	(82)	(78)
Foreign currency translation and other	9	(6)
Balance, December 31, 2020	64	67
Cost Reduction Program
Restructuring Cost and Reserve [Line Items]
Cost reduction programs and other charges	391	304
Less: Cash payments	(176)	(148)
Less: Non-cash charges	(68)	(21)
Foreign currency translation and other	25	(2)
Balance, December 31, 2020	305	133
Cost Reduction Program | Severance costs
Restructuring Cost and Reserve [Line Items]
Cost reduction programs and other charges	298	204
Less: Cash payments	(156)	(91)
Less: Non-cash charges	0	0
Foreign currency translation and other	24	4
Balance, December 31, 2020	283	117
Cost Reduction Program | Other cost reduction charges
Restructuring Cost and Reserve [Line Items]
Cost reduction programs and other charges	93	100
Less: Cash payments	(20)	(57)
Less: Non-cash charges	(68)	(21)
Foreign currency translation and other	1	(6)
Balance, December 31, 2020	$ 22	$ 16

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