Cost Reduction Programs and Other Charges - Summary of Activity (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Restructuring Cost and Reserve [Line Items]
2019 Cost Reduction Programs and Other Charges	$ 567	$ 309	$ 52
Less: Cash payments	(260)
Less: Non-cash charges	(99)
Foreign currency translation and other	(8)
Balance, December 31, 2019	200
Severance costs
Restructuring Cost and Reserve [Line Items]
2019 Cost Reduction Programs and Other Charges	204
Other cost reduction charges
Restructuring Cost and Reserve [Line Items]
2019 Cost Reduction Programs and Other Charges	100
Transaction related and other charges
Restructuring Cost and Reserve [Line Items]
2019 Cost Reduction Programs and Other Charges	263
Less: Cash payments	(112)
Less: Non-cash charges	(78)
Foreign currency translation and other	(6)
Balance, December 31, 2019	67
Cost Reduction Program
Restructuring Cost and Reserve [Line Items]
2019 Cost Reduction Programs and Other Charges	304
Less: Cash payments	(148)
Less: Non-cash charges	(21)
Foreign currency translation and other	(2)
Balance, December 31, 2019	133
Cost Reduction Program | Severance costs
Restructuring Cost and Reserve [Line Items]
2019 Cost Reduction Programs and Other Charges	204
Less: Cash payments	(91)
Less: Non-cash charges	0
Foreign currency translation and other	4
Balance, December 31, 2019	117
Cost Reduction Program | Other cost reduction charges
Restructuring Cost and Reserve [Line Items]
2019 Cost Reduction Programs and Other Charges	100
Less: Cash payments	(57)
Less: Non-cash charges	(21)
Foreign currency translation and other	(6)
Balance, December 31, 2019	$ 16