Partners' Equity - Schedule of Cash Distributions (Details) - USD ($) $ / shares in Units, $ in Millions		Aug. 28, 2018	Aug. 21, 2018	Aug. 14, 2018	Aug. 01, 2018	May 29, 2018	May 22, 2018	May 15, 2018	May 14, 2018	May 01, 2018	Feb. 27, 2018	Feb. 20, 2018	Feb. 15, 2018	Feb. 09, 2018	Nov. 21, 2017	Nov. 14, 2017	Oct. 31, 2017	Aug. 29, 2017	Aug. 22, 2017	Aug. 14, 2017	Jul. 31, 2017	May 30, 2017	May 23, 2017	May 12, 2017	May 02, 2017	Feb. 28, 2017	Feb. 21, 2017	Feb. 15, 2017	Feb. 10, 2017
Distribution Made to Limited Partner [Line Items]
Record Date							May 22, 2018					Feb. 20, 2018				Nov. 14, 2017			Aug. 22, 2017				May 23, 2017				Feb. 21, 2017
Payment Date						May 29, 2018					Feb. 27, 2018				Nov. 21, 2017			Aug. 29, 2017				May 30, 2017				Feb. 28, 2017
Series A 10% Fixed to Floating Non Cumulative Redeemable Perpetual Preferred Units | Preferred Units
Distribution Made to Limited Partner [Line Items]
Record Date										May 01, 2018				Feb. 09, 2018			Oct. 31, 2017				Jul. 31, 2017				May 02, 2017				Feb. 10, 2017
Payment Date									May 15, 2018				Feb. 15, 2018			Nov. 14, 2017				Aug. 14, 2017				May 12, 2017				Feb. 15, 2017
Cash Distribution
Distribution Made to Limited Partner [Line Items]
Cash distribution declared (in dollars per unit)						$ 0.318					$ 0.318				$ 0.318			$ 0.318				$ 0.318				$ 0.318
Distribution made to unitholders						$ 138					$ 138				$ 138			$ 138				$ 137				$ 137
Cash Distribution | Series A 10% Fixed to Floating Non Cumulative Redeemable Perpetual Preferred Units | Preferred Units
Distribution Made to Limited Partner [Line Items]
Cash distribution declared (in dollars per unit)								$ 0.625					$ 0.625			$ 0.625				$ 0.625				$ 0.625				$ 0.625
Distribution made to unitholders									$ 9				$ 9			$ 9				$ 9				$ 9				$ 9
Subsequent Event
Distribution Made to Limited Partner [Line Items]
Record Date	[1]		Aug. 21, 2018
Payment Date	[1]	Aug. 28, 2018
Subsequent Event | Series A 10% Fixed to Floating Non Cumulative Redeemable Perpetual Preferred Units | Preferred Units
Distribution Made to Limited Partner [Line Items]
Record Date	[2]				Aug. 01, 2018
Payment Date	[2]			Aug. 14, 2018
Subsequent Event | Cash Distribution
Distribution Made to Limited Partner [Line Items]
Cash distribution (in dollars per unit)	[1]				$ 0.318
Cash distribution declared (in dollars per unit)	[1]	$ 0.318
Distribution made to unitholders	[1]	$ 138
Subsequent Event | Cash Distribution | Series A 10% Fixed to Floating Non Cumulative Redeemable Perpetual Preferred Units
Distribution Made to Limited Partner [Line Items]
Cash distribution declared (in dollars per unit)					0.625
Subsequent Event | Cash Distribution | Series A 10% Fixed to Floating Non Cumulative Redeemable Perpetual Preferred Units | Preferred Units
Distribution Made to Limited Partner [Line Items]
Cash distribution (in dollars per unit)					$ 0.625
Cash distribution declared (in dollars per unit)	[2]			$ 0.625
Distribution made to unitholders	[2]			$ 9

[1] The board of directors of Enable GP declared this $0.318 per common unit cash distribution on August 1, 2018, to be paid on August 28, 2018, to common unitholders of record at the close of business on August 21, 2018.

[2] The board of directors of Enable GP declared a $0.625 per Series A Preferred Unit cash distribution on August 1, 2018, to be paid on August 14, 2018, to Series A Preferred unitholders of record at the close of business on August 1, 2018.