Inventories (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
LIFO method related items [Abstract]
LIFO inventory amount	$ 186	$ 177
Inventory, LIFO reserve	24	31
Inventory, net [Abstract]
Finished products and parts	1,947	1,547
Raw materials and supplies	934	703
Work in process	147	146
Total	3,028	2,396
Obsolescence reserves	$ 219	$ 276

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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