This item represents disclosure of the amount of dividends or other distributions received from unconsolidated subsidiaries, certain corporate joint ventures, and certain noncontrolled corporation; these investments are accounted for under the cost method of accounting. This element excludes distributions that constitute a return of investment, which are classified as investing activities.

No definition available.

Subsequent Events (Details) - USD ($) $ / shares in Units, $ in Millions														12 Months Ended
	Feb. 12, 2021	Dec. 10, 2020	Oct. 29, 2020	Jul. 29, 2020	Apr. 24, 2020	Feb. 03, 2020	Oct. 17, 2019	Jul. 31, 2019	Apr. 25, 2019	Dec. 12, 2018	Oct. 23, 2018	Jul. 26, 2018	Apr. 26, 2018	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Feb. 24, 2021	Feb. 16, 2021
Subsequent Event [Line Items]
Expected cash distribution on Enable Common Units														$ 113	$ 261	$ 267
Subsequent Event [Member]
Subsequent Event [Line Items]
Proceeds from Merger - Preferred Units																		$ 385
Proceeds from Merger - Interest																		$ 5
Merger Exchange Ratio																		0.8595
Series A Preferred Units [Member] \| Subsequent Event [Member] \| Enable Midstream Partners [Member]
Subsequent Event [Line Items]
Declaration Date	Feb. 12, 2021
Record Date	Feb. 12, 2021
Payment Date	Feb. 12, 2021
Distributions Declared, Per Unit	$ 0.62500
Expected cash distribution on Enable's Series A Preferred Units	$ 9
Common Units [Member] \| Subsequent Event [Member] \| Enable Midstream Partners [Member]
Subsequent Event [Line Items]
Declaration Date	Feb. 12, 2021
Record Date	Feb. 22, 2021
Payment Date	Mar. 01, 2021
Distributions Declared, Per Unit	$ 0.16525
Expected cash distribution on Enable Common Units	$ 39
Common Stock [Member]
Subsequent Event [Line Items]
Declaration Date		Dec. 10, 2020	Oct. 29, 2020				Oct. 17, 2019	Jul. 31, 2019	Apr. 25, 2019	Dec. 12, 2018	Oct. 23, 2018	Jul. 26, 2018	Apr. 26, 2018
Record Date		Feb. 18, 2021	Nov. 19, 2020				Nov. 21, 2019	Aug. 15, 2019	May 16, 2019	Feb. 21, 2019	Nov. 15, 2018	Aug. 16, 2018	May 17, 2018
Payment Date		Mar. 11, 2021	Dec. 10, 2020				Dec. 12, 2019	Sep. 12, 2019	Jun. 13, 2019	Mar. 14, 2019	Dec. 13, 2018	Sep. 13, 2018	Jun. 14, 2018
Common Stock, Dividends, Per Share, Declared		$ 0.1600	$ 0.1500	$ 0.1500	$ 0.1500	$ 0.2900	$ 0.2875	$ 0.2875	$ 0.2875	$ 0.2875	$ 0.2775	$ 0.2775	$ 0.2775	$ 0.9000	$ 0.8625	$ 1.1200
Series A Preferred Stock [Member]
Subsequent Event [Line Items]
Declaration Date								Jul. 31, 2019		Dec. 12, 2018
Record Date								Aug. 15, 2019		Feb. 15, 2019
Payment Date								Sep. 03, 2019		Mar. 01, 2019
Preferred stock dividends declared per share		$ 30.6250		$ 30.6250		$ 30.6250		$ 30.6250		$ 32.1563				$ 91.8750	30.6250	32.1563
Series B Preferred Stock [Member]
Subsequent Event [Line Items]
Declaration Date		Dec. 10, 2020	Oct. 29, 2020				Oct. 17, 2019	Jul. 31, 2019	Apr. 25, 2019	Dec. 12, 2018	Oct. 23, 2018
Record Date		Feb. 15, 2021	Nov. 13, 2020				Nov. 15, 2019	Aug. 15, 2019	May 15, 2019	Feb. 15, 2019	Nov. 15, 2018
Payment Date		Mar. 01, 2021	Dec. 01, 2020				Dec. 02, 2019	Sep. 03, 2019	Jun. 03, 2019	Mar. 01, 2019	Dec. 01, 2018
Preferred stock dividends declared per share		$ 17.5000	$ 17.5000				$ 17.5000	$ 17.5000	$ 17.5000	$ 17.5000	$ 11.6667				$ 52.5000	$ 29.1667
CERC Corp [Member]
Subsequent Event [Line Items]
Expected cash distribution on Enable Common Units														$ 0	$ 0	$ 176
CERC Corp [Member] \| Subsequent Event [Member]
Subsequent Event [Line Items]
Financing Commitments																	$ 1,700