Supplemental Data (Summary of Cash Flow Effects of Decrease (Increase) in Operating Working Capital) (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Accounts receivable	$ (44)	$ (23)	$ 60
Inventories	(33)	230	(28)
Trade accounts payable	174	(61)	44
Accrued expenses	(102)	26	(110)
Accrued income taxes	(176)	121	(81)
Derivatives	(47)	43	(63)
Currency and other	80	(2)	(267)
Total	$ (148)	$ 334	$ (445)

Foreign Currency Transaction Gain (Loss) and Other

No definition available.

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Balance Type:	credit
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- Definition

Change in recurring obligations of a business that arise from the acquisition of merchandise, materials, supplies and services used in the production and sale of goods and services.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585

+ Details

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Period Type:	duration

- Definition

The increase (decrease) during the reporting period in amount due within one year (or one business cycle) from customers for the credit sale of goods and services.

+ References

+ Details

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- Definition

The increase (decrease) during the reporting period in the aggregate amount of expenses incurred but not yet paid.

+ References

+ Details

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Period Type:	duration

- Definition

The increase (decrease) during the reporting period of all taxes owed but not paid, including income, property and other taxes.

+ References

No definition available.

+ Details

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- Definition

The increase (decrease) during the period in the net carrying value of derivative instruments reported as assets and liabilities that are due to be disposed of within one year (or the normal operating cycle, if longer).

+ References

No definition available.

+ Details

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Period Type:	duration

- Definition

The increase (decrease) during the reporting period in the aggregate value of all inventory held by the reporting entity, associated with underlying transactions that are classified as operating activities.

+ References

+ Details

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Balance Type:	credit
Period Type:	duration

- Definition

The increase (decrease) during the reporting period of all assets and liabilities used in operating activities.

+ References

+ Details

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