Restructuring Programs - Information Related to Restructuring Program Activity (Details) - USD ($) $ in Millions		3 Months Ended					6 Months Ended
		Jun. 30, 2019		Mar. 31, 2019		Jun. 30, 2018	Jun. 30, 2019		Jun. 30, 2018
Restructuring Reserve [Roll Forward]
Balance at beginning of period		$ 80		$ 95			$ 95
Provision		26		62
Reversals		(8)		(8)			(16)
Net current period charges	[1]	18		54			72
Charges against reserve and currency		(29)		(69)		$ (40)	(98)		$ (92)
Balance at end of period		69		80			69
Leased right-of-use asset write-off	[2]						34
Owned asset write-off	[2]						12
Severance and Related Costs
Restructuring Reserve [Roll Forward]
Balance at beginning of period		66		94			94
Provision		13		12			25
Reversals		(6)		(8)
Net current period charges	[1]	7		4
Charges against reserve and currency		(17)		(32)
Balance at end of period		56		66			56
Other Contractual Termination Costs
Restructuring Reserve [Roll Forward]
Balance at beginning of period	[3]	14		1			1
Provision		3	[3]	14	[3]		17
Reversals	[3]	0		0
Net current period charges	[1],[3]	3		14
Charges against reserve and currency	[3]	(4)		(1)
Balance at end of period	[3]	13		14			13
Asset Impairments
Restructuring Reserve [Roll Forward]
Balance at beginning of period	[2]	0		0			0
Provision		10	[3]	36	[2]		46	[2]
Reversals		(2)	[3]	0	[2]
Net current period charges	[1]	8	[3]	36	[2]
Charges against reserve and currency		(8)	[3]	(36)	[2]
Balance at end of period		$ 0	[3]	$ 0	[2]		$ 0	[3]

[1] Represents net amount recognized within the Condensed Consolidated Statements of Income for the period shown for restructuring and asset impairment charges.

[2] Primarily related to the exit and abandonment of leased and owned facilities. The charge includes the accelerated write-off of $34 for leased right-of-use asset balances and $12 for owned asset balances upon exit from the facility net of any potential sublease income or other recovery amounts.

[3] Primarily includes additional costs incurred upon the exit from our facilities including decommissioning costs and associated contractual termination costs.