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Reportable Segments Assets (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Segment Reporting Information [Line Items]
Assets	$ 71,973	$ 74,157
Operating Segments | Natural Gas Pipelines
Segment Reporting Information [Line Items]
Assets	48,597	50,310
Operating Segments | Products Pipelines
Segment Reporting Information [Line Items]
Assets	9,182	9,468
Operating Segments | Terminals
Segment Reporting Information [Line Items]
Assets	8,639	8,890
Operating Segments | CO2
Segment Reporting Information [Line Items]
Assets	2,478	3,523
Other
Segment Reporting Information [Line Items]
Assets	$ 3,077	$ 1,966

X

- Definition

Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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