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Significant Accounting Policies - Narrative (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2018
Property, Plant and Equipment [Line Items]
Shipping and handling costs recorded in sales									$ 10	$ 16	$ 16
Sales rebates and discounts									357	360	388
Reserves for customer programs and incentives	$ 57				$ 54				57	54
Revenues	594	$ 577	$ 569	$ 545	547	$ 534	$ 514	$ 489	2,285	2,084	1,929
Advertising costs									63	61	58
Research and development costs									14	13	13
Reduction of operating income as a result of adopting new accounting guidance	(105)	$ (102)	$ (100)	$ (88)	(113)	$ (87)	$ (100)	$ (94)	(395)	(394)	(396)
Reduction in retained earnings from adoption of new accounting guidance	399				$ 167				399	167
Accounting Standards Update 2017-07
Property, Plant and Equipment [Line Items]
Reduction of operating income as a result of adopting new accounting guidance										138	35
Accounting Standards Update 2018-02
Property, Plant and Equipment [Line Items]
Reduction in retained earnings from adoption of new accounting guidance	$ 8								8
Franchise
Property, Plant and Equipment [Line Items]
Revenues									$ 29	$ 28	$ 25
Minimum \| Buildings
Property, Plant and Equipment [Line Items]
Estimated useful life of property, plant and equipment									P5Y
Minimum \| Machinery and equipment
Property, Plant and Equipment [Line Items]
Estimated useful life of property, plant and equipment									P5Y
Maximum \| Buildings
Property, Plant and Equipment [Line Items]
Estimated useful life of property, plant and equipment									P25Y
Maximum \| Machinery and equipment
Property, Plant and Equipment [Line Items]
Estimated useful life of property, plant and equipment									P30Y
Difference between Revenue Guidance in Effect before and after Topic 606 \| Minimum \| Accounting Standards Update 2014-09 \| Scenario, Forecast
Property, Plant and Equipment [Line Items]
Reduction in retained earnings from adoption of new accounting guidance												$ 15
Difference between Revenue Guidance in Effect before and after Topic 606 \| Maximum \| Accounting Standards Update 2014-09 \| Scenario, Forecast
Property, Plant and Equipment [Line Items]
Reduction in retained earnings from adoption of new accounting guidance												$ 20