Debt And Related Expenses (Narrative) (Details) - USD ($)	1 Months Ended	12 Months Ended
	Nov. 30, 2014	Dec. 31, 2016	Dec. 31, 2014	Jul. 31, 2016	Dec. 31, 2015	Jun. 30, 2015	May 31, 2015
Debt Instrument [Line Items]
Outstanding letters of credit		$ 140,000,000
Repayment of commercial paper		626,000,000
Commercial paper		0			$ 626,000,000
Redemption of senior notes	$ 1,900,000,000	2,100,000,000
Loss on early retirement of debt		265,000,000	$ 51,000,000
EnLink [Member]
Debt Instrument [Line Items]
Outstanding credit facility borrowings		$ 148,000,000			$ 414,000,000
5.85% due December 15, 2025 [Member]
Debt Instrument [Line Items]
Debt interest rate, stated percentage		5.85%			5.85%
Debt, maturity date		Dec. 15, 2025
5.00% due June 15, 2045 [Member]
Debt Instrument [Line Items]
Debt interest rate, stated percentage		5.00%			5.00%
Debt, maturity date		Jun. 15, 2045
4.85% due July 15, 2026 [Member] | EnLink [Member]
Debt Instrument [Line Items]
Debt interest rate, stated percentage		4.85%
Debt, maturity date		Jul. 15, 2026
4.15% due June 1, 2025 [Member] | EnLink [Member]
Debt Instrument [Line Items]
Debt interest rate, stated percentage		4.15%			4.15%
Debt, maturity date		Jun. 01, 2025
5.05% due April 1, 2045 [Member] | EnLink [Member]
Debt Instrument [Line Items]
Debt interest rate, stated percentage		5.05%			5.05%
Debt, maturity date		Apr. 01, 2045
Senior Notes [Member]
Debt Instrument [Line Items]
Loss on early retirement of debt	$ 40,000,000	$ 265,000,000
Senior Notes [Member] | EnLink [Member]
Debt Instrument [Line Items]
Debt instrument, face amount							$ 900,000,000
Senior Notes [Member] | 5.85% due December 15, 2025 [Member]
Debt Instrument [Line Items]
Debt instrument, face amount					$ 850,000,000
Debt interest rate, stated percentage					5.85%
Debt, maturity date		Dec. 15, 2025
Senior Notes [Member] | 5.00% due June 15, 2045 [Member]
Debt Instrument [Line Items]
Debt instrument, face amount						$ 750,000,000
Debt interest rate, stated percentage						5.00%
Debt, maturity date		Jun. 15, 2045
Senior Notes [Member] | 4.85% due July 15, 2026 [Member] | EnLink [Member]
Debt Instrument [Line Items]
Debt instrument, face amount				$ 500,000,000
Debt interest rate, stated percentage				4.85%
Senior Notes [Member] | 4.15% due June 1, 2025 [Member] | EnLink [Member]
Debt Instrument [Line Items]
Debt instrument, face amount							$ 750,000,000
Debt interest rate, stated percentage							4.15%
Senior Notes [Member] | 5.05% due April 1, 2045 [Member] | EnLink [Member]
Debt Instrument [Line Items]
Debt instrument, face amount							$ 150,000,000
Debt interest rate, stated percentage							5.05%
Commercial Paper [Member]
Debt Instrument [Line Items]
Credit Facility, borrowing capacity		$ 3,000,000,000
Senior Credit Facility [Member]
Debt Instrument [Line Items]
Credit Facility, borrowing capacity		$ 3,000,000,000
Frequency of payment		annual
Commitment fee amount		$ 7,600,000
Outstanding credit facility borrowings		0
Outstanding letters of credit		$ 57,000,000
Debt-to-capitalization ratio		0.187
Senior Credit Facility [Member] | Maximum [Member]
Debt Instrument [Line Items]
Debt-to-capitalization ratio		0.65
$30 Million Of Senior Credit Facility [Member]
Debt Instrument [Line Items]
Credit Facility, borrowing capacity		$ 30,000,000
Line of credit facility expiration date		Oct. 24, 2017
$164 Million Of Senior Credit Facility [Member]
Debt Instrument [Line Items]
Credit Facility, borrowing capacity		$ 164,000,000
Line of credit facility expiration date		Oct. 24, 2018
$2.8 Billion Of Senior Credit Facility [Member]
Debt Instrument [Line Items]
Credit Facility, borrowing capacity		$ 2,800,000,000
Line of credit facility expiration date		Oct. 24, 2019
Unsecured Revolving Credit Facility [Member] | EnLink [Member]
Debt Instrument [Line Items]
Credit Facility, borrowing capacity		$ 1,500,000,000
Line of credit facility expiration date		Mar. 06, 2020
Outstanding credit facility borrowings		$ 120,000,000
Outstanding letters of credit		$ 12,000,000
Line of credit average interest rate during period		2.30%
Revolving Credit Facility [Member] | General Partner [Member]
Debt Instrument [Line Items]
Credit Facility, borrowing capacity		$ 250,000,000
Line of credit facility expiration date		Mar. 07, 2019
Outstanding credit facility borrowings		$ 28,000,000
Line of credit average interest rate during period		3.40%