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Property, Plant, and Equipment (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016
Property, Plant and Equipment [Line Items] |  |
Gross property, plant and equipment | $ 20,770 | $ 19,730
Accumulated depreciation | 12,249 | 11,198
Net property, plant and equipment | 8,521 | 8,532
Building and Building Improvements [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Gross property, plant and equipment | $ 3,460 | $ 3,399
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) | 22.00% | 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%
Land |  |
Property, Plant and Equipment [Line Items] |  |
Gross property, plant and equipment | $ 248 | $ 228
Machinery, equipment and other |  |
Property, Plant and Equipment [Line Items] |  |
Gross property, plant and equipment | $ 17,062 | $ 16,103
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) | 35.00% | 34.00%
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% | 57.00%
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) | 9.00% | 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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