Supplemental Data (Summary of Property, Plant and Equipment, Net) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Supplemental Data
Land	$ 177us-gaap_Land	$ 196us-gaap_Land
Buildings	2,574us-gaap_BuildingsAndImprovementsGross	2,776us-gaap_BuildingsAndImprovementsGross
Machinery and equipment	13,437us-gaap_MachineryAndEquipmentGross	14,193us-gaap_MachineryAndEquipmentGross
Construction in progress	591us-gaap_ConstructionInProgressGross	515us-gaap_ConstructionInProgressGross
Total before accumulated depreciation	16,779us-gaap_PropertyPlantAndEquipmentGross	17,680us-gaap_PropertyPlantAndEquipmentGross
Less accumulated depreciation	(9,420)	(9,732)
Total	$ 7,359us-gaap_PropertyPlantAndEquipmentNet	$ 7,948us-gaap_PropertyPlantAndEquipmentNet

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Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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Amount before accumulated depreciation of building structures held for productive use including addition, improvement, or renovation to the structure, including, but not limited to, interior masonry, interior flooring, electrical, and plumbing.

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Amount of structure or a modification to a structure under construction. Includes recently completed structures or modifications to structures that have not been placed into service.

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Amount before accumulated depletion of real estate held for productive use, excluding land held for sale.

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Amount before accumulated depreciation of tangible personal property used to produce goods and services, including, but is not limited to, tools, dies and molds, computer and office equipment.

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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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