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Property, Plant and Equipment Classes and Depreciation (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Property, Plant and Equipment [Line Items]
Accumulated depreciation, depletion and amortization	$ (17,818)	$ (16,950)
Property, Plant and Equipment, Net, Excluding Nondepreciable Assets	33,851	34,057
Property, plant and equipment, net	35,836	36,419
Depreciation, Depletion and Amortization, Property, Plant and Equipment	1,928	2,176	$ 2,057
Pipelines
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	20,339	19,856
Equipment
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	26,142	25,791
Other
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	5,188	5,360
Land and land rights-of-way
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	1,403	1,356
Construction work in process
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	582	1,006
Natural Gas Pipelines Regulated
Property, Plant and Equipment [Line Items]
Property, plant and equipment, net	$ 12,160	$ 12,229

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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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