Supplemental Balance Sheet Data - Inventory (Details) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Raw materials	$ 335	$ 345
Work in process	226	213
Finished goods	1,114	1,105
Supplies and other	279	303
Inventory, Gross	1,954	1,966
Excess of FIFO or weighted-average cost over LIFO cost	(184)	(176)
Total	1,770	1,790
LIFO
Raw materials	83	87
Work in process	120	110
Finished goods	450	421
Supplies and other	0	0
Inventory, Gross	653	618
Excess of FIFO or weighted-average cost over LIFO cost	(184)	(176)
Total	469	442
Non-LIFO
Raw materials	252	258
Work in process	106	103
Finished goods	664	684
Supplies and other	279	303
Inventory, Gross	1,301	1,348
Excess of FIFO or weighted-average cost over LIFO cost	0	0
Total	$ 1,301	$ 1,348

Amount before valuation and LIFO reserves of completed merchandise or goods expected to be sold within one year or operating cycle, if longer.

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Gross amount, as of the balance sheet date, of merchandise, goods, commodities, or supplies held for future sale or to be used in manufacturing, servicing or production process.

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Amount by which inventory stated at last-in first-out (LIFO) is less than (in excess of) inventory stated at other inventory cost methods.

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Amount after valuation and LIFO reserves of inventory expected to be sold, or consumed within one year or operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.6(a))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 330
-SubTopic 10
-Section 35
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=68049868&loc=d3e3927-108312

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section 45
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=82887183&loc=d3e6676-107765

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Amount before valuation and LIFO reserves of raw materials expected to be sold, or consumed within one year or operating cycle, if longer.

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Amount before valuation and LIFO reserves of merchandise or goods in the production process expected to be completed within one year or operating cycle, if longer.

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Amount before valuation and LIFO reserves of other supplies used within the manufacturing or production process expected to be consumed within one year or operating cycle, if longer.

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