Transaction Costs and Other Charges - Narrative (Details) $ / shares in Units, $ in Millions	2 Months Ended	3 Months Ended	12 Months Ended
	Dec. 31, 2018 USD ($)	Sep. 30, 2016 USD ($) position	Dec. 31, 2018 USD ($) $ / shares	Dec. 31, 2017 USD ($) $ / shares	Dec. 31, 2016 USD ($) $ / shares
Extraordinary Item [Line Items]
Transaction costs and other charges			$ 309		$ 96
Transaction costs and other charges, net of tax			$ 306		$ 63
Transaction costs and other charges, effect on diluted earnings per share (USD per share) | $ / shares			$ (0.92)		$ (0.22)
Transaction costs	$ 236			$ 52
Transaction costs, net of tax			$ 236	$ 48
Other charges			73
Other charges, net of tax			70
Transaction costs, effect on diluted earnings per share (USD per share) | $ / shares				$ (0.17)
Severance costs			7	$ 6	$ 7
Number of positions eliminated | position		730
Total cash requirement of the cost reduction program and other charges		$ 50
Other Charges, China Unfavorable Arbitration Ruling
Extraordinary Item [Line Items]
Other charges			40
Other charges, net of tax			40
Other Charges, Restructuring
Extraordinary Item [Line Items]
Other charges			21
Other charges, net of tax			18
Other Charges, Argentina Hyper-Inflation
Extraordinary Item [Line Items]
Other charges			12
Other charges, net of tax			$ 12
Total | Severance costs
Extraordinary Item [Line Items]
Severance costs		40
Total | Other Charges
Extraordinary Item [Line Items]
Other Charges		$ 56