Supplementary Financial Statement Information (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Temporary Investments	$ 335	$ 402
Percentage of inventories valued using last-in, first-out inventory method	71.00%
Excess of replacement or current costs over stated LIFO value	$ 295	329
Capital expenditures incurred but not yet paid	164	135	$ 275
Depreciation expense	1,200	1,200	1,200
Interest payments	754	772	$ 782
Asset retirement obligation	$ 96	$ 86
Building [Member] \| Minimum [Member]
Property, plant and equipment, useful life	20 years
Building [Member] \| Maximum [Member]
Property, plant and equipment, useful life	40 years
Machinery and Equipment [Member] \| Minimum [Member]
Property, plant and equipment, useful life	3 years
Machinery and Equipment [Member] \| Maximum [Member]
Property, plant and equipment, useful life	20 years

The carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees.

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Future cash outflow to pay for purchases of fixed assets that have occurred.

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The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.

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Amount of short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates, classified as other. Excludes cash and cash equivalents within disposal group and discontinued operation.

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The percentage of LIFO (last in first out) inventory to total inventory as of the balance sheet date if other than 100 percent.

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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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