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Property, Plant and Equipment Classes and Depreciation (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Property, Plant and Equipment [Line Items]
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment	$ 15,359	$ 14,175
Property, Plant and Equipment, Net, Excluding Nondepreciable Assets	34,207	35,704
Property, plant and equipment, net	37,897	40,155
Depreciation, Depletion and Amortization, Property, Plant and Equipment	2,057	2,022	$ 1,970
Pipelines
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	19,727	20,157
Equipment
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	24,392	24,152
Other
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	5,447	5,570
Land [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	1,378	1,456
Construction work in progress [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	2,312	2,995
Natural Gas Pipelines Regulated
Property, Plant and Equipment [Line Items]
Property, plant and equipment, net	$ 12,349	$ 14,055

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Depreciation, Depletion and Amortization, Property, Plant and Equipment

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Property, Plant and Equipment, Net, Excluding Nondepreciable Assets

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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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