Accounting Policies - Narrative (Details) - USD ($)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net Sales	$ 3,928,000,000	$ 3,921,000,000	$ 11,599,000,000	$ 11,306,000,000
Net Income	354,000,000	132,000,000	598,000,000	455,000,000
Cost of Goods Sold	(3,028,000,000)	(3,054,000,000)	(8,953,000,000)	(8,599,000,000)
Selling, general and administrative expense reclassified	(553,000,000)	(545,000,000)	(1,732,000,000)	(1,700,000,000)
Other (income) expense reclassified	(253,000,000)	30,000,000	(171,000,000)	54,000,000
Cumulative effect of adoption of new accounting standards						$ (1,000,000)	$ 0
Accounting Standards Update 2014-09 | Difference between Revenue Guidance in Effect before and after Topic 606
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net Sales	0		7,000,000
Net Income	$ 0		5,000,000
Accounting Standards Update 2016-09
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cost of Goods Sold		15,000,000		27,000,000
Selling, general and administrative expense reclassified		11,000,000		18,000,000
General and administrative expense reclassified		$ 16,000,000		$ 22,000,000
Other (income) expense reclassified			$ 9,000,000
Accounting Standards Update 2016-09 | Scenario, Forecast
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net periodic defined benefits expense (reversal of expense)					$ 35,000,000
Net periodic defined benefits expense (reversal of expense), corporate related costs					5,000,000
Net periodic defined benefits expense (reversal of expense), excluding service cost component					90,000,000
Net periodic defined benefits expense (reversal of expense), excluding service cost component, corporate related costs					$ 15,000,000
Accounting Standards Update 2016-16 | Deferred Income Taxes
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect of adoption of new accounting standards						7,000,000
Accounting Standards Update 2016-16 | Other Assets
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect of adoption of new accounting standards						(5,000,000)
Accounting Standards Update 2016-16 | Retained Earnings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect of adoption of new accounting standards						$ 2,000,000