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Significant Accounting Policies (Property) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Property, Plant and Equipment [Line Items]
Accumulated depreciation	$ (6,780)	$ (6,444)
Property plant and equipment, net	3,199	3,301
Land
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	92	97
Buildings
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 1,517	1,540
Buildings | Minimum
Property, Plant and Equipment [Line Items]
Estimated Useful Life	10 years
Buildings | Maximum
Property, Plant and Equipment [Line Items]
Estimated Useful Life	50 years
Machinery and equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 8,370	$ 8,108
Machinery and equipment | Minimum
Property, Plant and Equipment [Line Items]
Estimated Useful Life	3 years
Machinery and equipment | Maximum
Property, Plant and Equipment [Line Items]
Estimated Useful Life	20 years

X

- Definition

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

+ References

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-Publisher FASB
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-SubTopic 10
-Section 50
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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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+ References

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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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