Restructuring Charges and Other Costs Associated with Acquisitions and Cost-Reduction/Productivity Initiatives - Narrative (Details) $ in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2019 USD ($) Operating_Segment	Dec. 31, 2018 Operating_Segment
Restructuring Cost and Reserve [Line Items]
Number of business segments | Operating_Segment	3	2
Restructuring costs incurred	$ 32
2017 Through 2019 Initiatives And Organizing For Growth [Member]
Restructuring Cost and Reserve [Line Items]
Expected restructuring cost	$ 600
Percentage of expected costs to be non-cash	20.00%
Restructuring costs incurred	$ 180
Manufacturing Plant Network Optimization [Member] | 2017 Through 2019 Initiatives And Organizing For Growth [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring costs incurred	774
Other Activities [Member] | 2017 Through 2019 Initiatives And Organizing For Growth [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring costs incurred	871
Business Integration Costs [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring costs incurred	(199)
Hospira [Member] | Business Integration Costs [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring costs incurred	$ 51