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Summary of Significant Accounting Policies - Principles of Consolidation, Shipping and Handling Costs, Inventories, & Property, Plant, and Equipment (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Principles of Consolidation [Abstract]
Investments accounted for using the equity method, minimum interest	20.00%
Investments accounted for using the equity method, maximum interest	50.00%
Equity method investments included in other assets	$ 42	$ 38
Investments accounted for using the cost method, maximum interest	20.00%
Shipping and Handling Costs [Abstract]
Shipping and handling costs classified as Selling, general and administrative expenses	$ 1,183	$ 1,140	$ 1,235
Inventories [Abstract]
Approximate percentage of inventories determined using the first-in, first-out (FIFO) method	75.00%
Minimum | Machinery and equipment
Property, Plant and Equipment [Line Items]
Estimated useful life	3 years
Maximum | Machinery and equipment
Property, Plant and Equipment [Line Items]
Estimated useful life	15 years
Maximum | Buildings
Property, Plant and Equipment [Line Items]
Estimated useful life	40 years

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The maximum percentage of ownership of common stock or equity participation in the investee accounted for under the cost method of accounting. This maximum is up to, but not including, the maximum value.

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=66022249&loc=d3e33749-111570

Reference 2: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-Section S99
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Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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Cost incurred during the reporting period in transporting goods and services to customers. Includes freight-out costs.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-URI http://asc.fasb.org/extlink&oid=84158767&loc=d3e18780-107790

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