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.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Section 50
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Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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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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Property, Plant & Equipment - Net - Property, Plant & Equipment - Net (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Property, Plant and Equipment
Gross Balance	$ 41,937	$ 25,291
Less: accumulated depreciation	(12,220)	(13,466)
Property, plant and equipment – net	29,717	11,825	$ 11,249
Production plants
Property, Plant and Equipment
Gross Balance	24,726	16,258
Storage tanks
Property, Plant and Equipment
Gross Balance	4,061	2,620
Transportation equipment and other
Property, Plant and Equipment
Gross Balance	2,654	1,588
Cylinders
Property, Plant and Equipment
Gross Balance	3,955	1,875
Buildings
Property, Plant and Equipment
Gross Balance	3,083	1,202
Land and improvements
Property, Plant and Equipment
Gross Balance	1,162	589
Construction in progress
Property, Plant and Equipment
Gross Balance	$ 2,296	$ 1,159
Minimum
Property, Plant and Equipment
Useful life	3 years
Minimum \| Production plants
Property, Plant and Equipment
Useful life	10 years
Minimum \| Storage tanks
Property, Plant and Equipment
Useful life	15 years
Minimum \| Transportation equipment and other
Property, Plant and Equipment
Useful life	3 years
Minimum \| Cylinders
Property, Plant and Equipment
Useful life	10 years
Minimum \| Buildings
Property, Plant and Equipment
Useful life	25 years
Minimum \| Land and improvements
Property, Plant and Equipment
Useful life	0 years
Maximum
Property, Plant and Equipment
Useful life	40 years
Maximum \| Production plants
Property, Plant and Equipment
Useful life	20 years
Maximum \| Storage tanks
Property, Plant and Equipment
Useful life	20 years
Maximum \| Transportation equipment and other
Property, Plant and Equipment
Useful life	15 years
Maximum \| Cylinders
Property, Plant and Equipment
Useful life	30 years
Maximum \| Buildings
Property, Plant and Equipment
Useful life	40 years
Maximum \| Land and improvements
Property, Plant and Equipment
Useful life	20 years