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Debt (Narrative) (Details) - USD ($) | 9 Months Ended |  |  |
--- | --- | --- | --- | ---
Sep. 30, 2015 | Jun. 30, 2015 | May. 31, 2015 | Dec. 31, 2014
Debt Instrument [Line Items] |  |  |  |
Repayment of commercial paper | $ 932,000,000 |  |  |
Commercial Paper | 0 |  |  | $ 932,000,000
Senior Credit Facility [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Credit Facility, borrowing capacity | 3,000,000,000 |  |  |
Outstanding Credit Facility borrowings | $ 0 |  |  |
Debt-to-capitalization ratio | 0.219 |  |  |
5.00% due June 15, 2045 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 5.00% |  |  | 5.00%
Debt Instrument, Maturity Date | Jun. 15, 2045 |  |  |
Floating Rate due December 15, 2015 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Maturity Date | Dec. 15, 2015 |  |  |
Senior Notes [Member] | 5.00% due June 15, 2045 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Face Amount |  | $ 750,000,000 |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 5.00% |  |
Senior Notes [Member] | Floating Rate due December 15, 2015 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Maturity Date | Dec. 15, 2015 |  |  |
EnLink [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Outstanding Credit Facility borrowings | $ 175,000,000 |  |  | $ 237,000,000
EnLink [Member] | Unsecured Revolving Credit Facility [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Credit Facility, borrowing capacity | 1,500,000,000 |  |  |
Outstanding Credit Facility borrowings | $ 175,000,000 |  |  |
Line of credit average interest rate during period | 1.46% |  |  |
EnLink [Member] | Unsecured Letter Of Credit Subfacility [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Outstanding Credit Facility borrowings | $ 2,800,000 |  |  |
EnLink [Member] | 4.15% due June 1, 2025 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 4.15% |  |  | 4.15%
Debt Instrument, Maturity Date | Jun. 01, 2025 |  |  |
EnLink [Member] | 5.05% due April 1, 2045 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 5.05% |  |  | 5.05%
Debt Instrument, Maturity Date | Apr. 01, 2045 |  |  |
EnLink [Member] | Senior Notes [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Face Amount |  |  | $ 900,000,000 |
EnLink [Member] | Senior Notes [Member] | 4.15% due June 1, 2025 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Face Amount |  |  | $ 750,000,000 |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 4.15% |
EnLink [Member] | Senior Notes [Member] | 5.05% due April 1, 2045 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Face Amount |  |  | $ 150,000,000 |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 5.05% |
General Partner [Member] | Revolving Credit Facility [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Credit Facility, borrowing capacity | $ 250,000,000 |  |  |
Outstanding Credit Facility borrowings | $ 0 |  |  |
Maximum [Member] | Senior Credit Facility [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt-to-capitalization ratio | 0.65 |  |  |

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- Definition 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. + References 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 -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.13(2)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 7 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 + Details
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