Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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This item represents an other than temporary decline in value that has been recognized against an investment accounted for under the equity method of accounting. The excess of the carrying amount over the fair value of the investment represents the amount of the write down which is or was reflected in earnings. The written down value is a new cost basis with the adjusted value of the investment becoming its new carrying value subject to the equity accounting method. Evidence of a loss in value might include, but would not necessarily be limited to, absence of an ability to recover the carrying amount of the investment or inability of the investee to sustain an earnings capacity which would justify the carrying amount of the investment.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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Amount of gain (loss) on sale or disposal of an equity method investment.

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Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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General Basis of Presentation (Details) $ in Millions	3 Months Ended			6 Months Ended
General Basis of Presentation (Details) $ in Millions	Jun. 30, 2016 USD ($)	Dec. 31, 2015 USD ($)	Jun. 30, 2015 USD ($)	Jun. 30, 2016 USD ($)	Jun. 30, 2015 USD ($)
Segment Reporting Information [Line Items]
Number of Operating Segments				7
Loss on impairments and disposals of long-lived assets and equity investments, net			$ 50	$ 257	$ 130
Equity Method Investment, Realized Gain (Loss) on Disposal	$ 12			12
Natural Gas Pipelines
Segment Reporting Information [Line Items]
Loss on impairments and disposals of long-lived assets and equity investments, net			48	106	99
Natural Gas Pipelines \| Fort Union Gas Gathering L.L.C. and Bighorn Gas Gathering L.L.C. [Member]
Segment Reporting Information [Line Items]
Loss on impairments of equity investments				13	26
CO2
Segment Reporting Information [Line Items]
Loss on impairments and disposals of long-lived assets and equity investments, net			9	33	9
Terminals
Segment Reporting Information [Line Items]
Loss on impairments and disposals of long-lived assets and equity investments, net				20
Products Pipelines
Segment Reporting Information [Line Items]
Loss on impairments and disposals of long-lived assets and equity investments, net				64
Products Pipelines \| Discontinued Operations, Held-for-sale [Member]
Segment Reporting Information [Line Items]
Loss on impairments and disposals of long-lived assets and equity investments, net				8
Other Assets
Segment Reporting Information [Line Items]
Loss on impairments and disposals of long-lived assets and equity investments, net			$ 7	$ 13	$ 4
Natural Gas Pipelines
Segment Reporting Information [Line Items]
Goodwill, Impairment Loss		$ 1,150