Debt (Narrative) (Details) $ in Millions	3 Months Ended
Mar. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)
Debt Instrument [Line Items]
Debt issuance costs	$ 56	$ 57
Repayment of commercial paper	626
Commercial paper	0	626
Senior Credit Facility [Member]
Debt Instrument [Line Items]
Credit Facility, borrowing capacity	3,000
Outstanding credit facility borrowings	$ 0
Debt-to-capitalization ratio	0.226
Letters of Credit [Member]
Debt Instrument [Line Items]
Outstanding credit facility borrowings	$ 43
EnLink [Member]
Debt Instrument [Line Items]
Debt issuance costs	23	24
Outstanding credit facility borrowings	552	414
EnLink [Member] \| Unsecured Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Credit Facility, borrowing capacity	1,500
Outstanding credit facility borrowings	$ 543
Line of credit average interest rate during period	2.23%
EnLink [Member] \| Unsecured Letter Of Credit Subfacility [Member]
Debt Instrument [Line Items]
Outstanding credit facility borrowings	$ 11
General Partner [Member] \| Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Credit Facility, borrowing capacity	250
Outstanding credit facility borrowings	$ 9
Line of credit average interest rate during period	4.25%
Maximum [Member] \| Senior Credit Facility [Member]
Debt Instrument [Line Items]
Debt-to-capitalization ratio	0.65
Accounting Standards Update 2015-03 [Member]
Debt Instrument [Line Items]
Debt issuance costs		$ 81

Carrying value as of the balance sheet date of short-term borrowings using unsecured obligations issued by banks, corporations and other borrowers to investors. The maturities of these money market securities generally do not exceed 270 days.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(a)(3))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
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Net amount of long-term deferred finance costs capitalized at the end of the reporting period.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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The cash outflow due to repaying amounts borrowed by issuing commercial paper.

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Reference 2: http://www.xbrl.org/2003/role/presentationRef
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