Property, Plant, and Equipment (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Gross property, plant and equipment	$ 22,143	$ 20,770
Accumulated depreciation	13,182	12,249
Net property, plant and equipment	8,961	8,521
Land
Property, Plant and Equipment [Line Items]
Gross property, plant and equipment	252	248
Building and Building Improvements [Member]
Property, Plant and Equipment [Line Items]
Gross property, plant and equipment	$ 3,461	$ 3,460
Building and Building Improvements [Member] \| 1 - 10 years
Property Plant Equipment Useful Lives Total Depreciated Percentages [Abstract]
Ratio of depreciation by useful asset life over total depreciation of asset (in hundredths)	11.00%	11.00%
Building and Building Improvements [Member] \| 11 - 20 years
Property Plant Equipment Useful Lives Total Depreciated Percentages [Abstract]
Ratio of depreciation by useful asset life over total depreciation of asset (in hundredths)	42.00%	42.00%
Building and Building Improvements [Member] \| 21 - 30 years
Property Plant Equipment Useful Lives Total Depreciated Percentages [Abstract]
Ratio of depreciation by useful asset life over total depreciation of asset (in hundredths)	23.00%	22.00%
Building and Building Improvements [Member] \| 31 - 40 years
Property Plant Equipment Useful Lives Total Depreciated Percentages [Abstract]
Ratio of depreciation by useful asset life over total depreciation of asset (in hundredths)	25.00%	25.00%
Machinery, equipment and other
Property, Plant and Equipment [Line Items]
Gross property, plant and equipment	$ 18,430	$ 17,062
Machinery, equipment and other \| 1 - 5 years
Property Plant Equipment Useful Lives Total Depreciated Percentages [Abstract]
Ratio of depreciation by useful asset life over total depreciation of asset (in hundredths)	34.00%	35.00%
Machinery, equipment and other \| 6 - 10 years
Property Plant Equipment Useful Lives Total Depreciated Percentages [Abstract]
Ratio of depreciation by useful asset life over total depreciation of asset (in hundredths)	56.00%	56.00%
Machinery, equipment and other \| 11 - 20 years
Property Plant Equipment Useful Lives Total Depreciated Percentages [Abstract]
Ratio of depreciation by useful asset life over total depreciation of asset (in hundredths)	10.00%	9.00%
Minimum \| Building and Building Improvements [Member] \| 1 - 10 years
Property, Plant and Equipment [Line Items]
Property, plant, and equipment useful lives	1 year
Minimum \| Building and Building Improvements [Member] \| 11 - 20 years
Property, Plant and Equipment [Line Items]
Property, plant, and equipment useful lives	11 years
Minimum \| Building and Building Improvements [Member] \| 21 - 30 years
Property, Plant and Equipment [Line Items]
Property, plant, and equipment useful lives	21 years
Minimum \| Building and Building Improvements [Member] \| 31 - 40 years
Property, Plant and Equipment [Line Items]
Property, plant, and equipment useful lives	31 years
Minimum \| Machinery, equipment and other \| 1 - 5 years
Property, Plant and Equipment [Line Items]
Property, plant, and equipment useful lives	1 year
Minimum \| Machinery, equipment and other \| 6 - 10 years
Property, Plant and Equipment [Line Items]
Property, plant, and equipment useful lives	6 years
Minimum \| Machinery, equipment and other \| 11 - 20 years
Property, Plant and Equipment [Line Items]
Property, plant, and equipment useful lives	11 years
Maximum \| Building and Building Improvements [Member] \| 1 - 10 years
Property, Plant and Equipment [Line Items]
Property, plant, and equipment useful lives	10 years
Maximum \| Building and Building Improvements [Member] \| 11 - 20 years
Property, Plant and Equipment [Line Items]
Property, plant, and equipment useful lives	20 years
Maximum \| Building and Building Improvements [Member] \| 21 - 30 years
Property, Plant and Equipment [Line Items]
Property, plant, and equipment useful lives	30 years
Maximum \| Building and Building Improvements [Member] \| 31 - 40 years
Property, Plant and Equipment [Line Items]
Property, plant, and equipment useful lives	40 years
Maximum \| Machinery, equipment and other \| 1 - 5 years
Property, Plant and Equipment [Line Items]
Property, plant, and equipment useful lives	5 years
Maximum \| Machinery, equipment and other \| 6 - 10 years
Property, Plant and Equipment [Line Items]
Property, plant, and equipment useful lives	10 years
Maximum \| Machinery, equipment and other \| 11 - 20 years
Property, Plant and Equipment [Line Items]
Property, plant, and equipment useful lives	20 years

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The ratio of depreciation by useful asset life in relation to the total depreciation of the asset during the period.

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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, 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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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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