Restructuring Programs - Information Related to Restructuring Program Activity (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Restructuring Reserve [Roll Forward]
Balance at beginning of period	$ 70
Provision	35
Reversals	(6)
Net current period charges	29
Charges against reserve and currency	(35)	$ (69)
Balance at end of period	64
Restructuring reserve, reclassification to other assets	4
Leased right-of-use asset write-off	1
Owned asset write-off	1
Severance and Related Costs
Restructuring Reserve [Roll Forward]
Balance at beginning of period	66
Provision	32
Reversals	(5)
Net current period charges	27
Charges against reserve and currency	(36)
Balance at end of period	57
Other Contractual Termination Costs
Restructuring Reserve [Roll Forward]
Balance at beginning of period	4
Provision	1
Reversals	0
Net current period charges	1
Charges against reserve and currency	2
Balance at end of period	7
Asset Impairments
Restructuring Reserve [Roll Forward]
Balance at beginning of period	0
Provision	2
Reversals	(1)
Net current period charges	1
Charges against reserve and currency	(1)
Balance at end of period	$ 0