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.

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Face (par) amount of debt instrument at time of issuance.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

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Gross amount of debt extinguished.

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The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

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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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The effective interest rate during the reporting period.

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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 for incremental, external costs directly pertaining to an early extinguishment of debt, including legal costs and prepayment penalties, and excluding interest and repayment of debt principal.

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Indebtedness divided by net capital.

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

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Debt And Related Expenses (Narrative) (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended	9 Months Ended
	Aug. 31, 2016	Sep. 30, 2016	Sep. 30, 2016	Jul. 31, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
Repayment of commercial paper			$ 626
Commercial paper		$ 0	0		$ 626
Redemption of senior notes	$ 1,200
Loss on early retirement of debt		82	82
Outstanding letters of credit		125	125
EnLink [Member]
Debt Instrument [Line Items]
Outstanding credit facility borrowings		98	98		$ 414
Senior Credit Facility [Member]
Debt Instrument [Line Items]
Credit Facility, borrowing capacity		3,000	3,000
Outstanding letters of credit		58	58
Outstanding credit facility borrowings		$ 0	$ 0
Debt-to-capitalization ratio		0.206	0.206
Unsecured Revolving Credit Facility [Member] \| EnLink [Member]
Debt Instrument [Line Items]
Credit Facility, borrowing capacity		$ 1,500	$ 1,500
Outstanding letters of credit		11	11
Outstanding credit facility borrowings		75	$ 75
Line of credit average interest rate during period			2.15%
Revolving Credit Facility [Member] \| General Partner [Member]
Debt Instrument [Line Items]
Credit Facility, borrowing capacity		250	$ 250
Outstanding credit facility borrowings		$ 23	$ 23
Line of credit average interest rate during period			2.28%
Maximum [Member] \| Senior Credit Facility [Member]
Debt Instrument [Line Items]
Debt-to-capitalization ratio		0.65	0.65
8.25% Due July 1, 2018 [Member]
Debt Instrument [Line Items]
Debt interest rate, stated percentage		8.25%	8.25%		8.25%
Debt, maturity date			Jul. 01, 2018
2.25% Due December 15, 2018 [Member]
Debt Instrument [Line Items]
Debt interest rate, stated percentage		2.25%	2.25%		2.25%
Debt, maturity date			Dec. 15, 2018
6.30% Due January 15, 2019 [Member]
Debt Instrument [Line Items]
Debt interest rate, stated percentage		6.30%	6.30%		6.30%
Debt, maturity date			Jan. 15, 2019
4.85% Unsecured Senior Notes Due 2026 [Member] \| EnLink [Member]
Debt Instrument [Line Items]
Principal amount of senior notes issued				$ 500
Debt interest rate, stated percentage				4.85%
Senior Notes [Member]
Debt Instrument [Line Items]
Loss on early retirement of debt	82
Senior Notes [Member] \| 8.25% Due July 1, 2018 [Member]
Debt Instrument [Line Items]
Redemption of senior notes	97
Principal amount of senior notes issued	$ 125
Debt interest rate, stated percentage	8.25%
Debt, maturity date	Jul. 01, 2018
Senior Notes [Member] \| 2.25% Due December 15, 2018 [Member]
Debt Instrument [Line Items]
Redemption of senior notes	$ 640
Principal amount of senior notes issued	$ 750
Debt interest rate, stated percentage	2.25%
Debt, maturity date	Dec. 15, 2018
Senior Notes [Member] \| 6.30% Due January 15, 2019 [Member]
Debt Instrument [Line Items]
Redemption of senior notes	$ 502
Principal amount of senior notes issued	$ 700
Debt interest rate, stated percentage	6.30%
Debt, maturity date	Jan. 15, 2019