Inventories (Details) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018
LIFO Method Related Items [Abstract]
LIFO Inventory Amount	$ 189	$ 186
Average Cost Method, Difference	24	24
Inventory, Net [Abstract]
Finished products and parts	2,063	1,947
Raw materials and supplies	1,047	934
Work in process	154	147
Inventory, net	3,264	3,028
Obsolescence reserves	$ 207	$ 219

Carrying amount, net of valuation reserves and adjustments, as of the balance sheet date of merchandise or goods held by the company that are readily available for sale.

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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.

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Gross amount of unprocessed materials to be used in manufacturing or production process and supplies that will be consumed.

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Amount of valuation reserve for inventory.

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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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The amount of LIFO (last in first out) inventory present at the reporting date when inventory is also valued using different valuation methods.

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