Divestitures (CenterPoint Energy and CERC) - Discontinued Operations (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021	Dec. 02, 2021
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Common and preferred units acquired (as a percent)						100.00%
Equity in earnings of unconsolidated affiliate, net			$ 0	$ 258
Income tax expense	$ 0	$ 15	0	56
Net income from discontinued operations	0	68	0	202
Distributions from unconsolidated affiliate - operating			0	116
Current assets	0		0		$ 2,338
Current liabilities	0		0		562
Operating revenues	1,903	1,749	6,610	6,038
Depreciation and amortization	329	353	974	987
Operating income	384	278	1,212	1,027
Net income attributable to Enable Common Units	189	195	886	750
CERC
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Current assets	0		0		2,084
Current liabilities	0		0		$ 562
Operating revenues	672	609	3,232	2,925
Depreciation and amortization	113	124	333	360
Operating income	$ 42	32	$ 421	428
Discontinued Operations | Enable Midstream Partners
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Equity in earnings of unconsolidated affiliate, net		83		258
Income from discontinued operations before income taxes		83		258
Income tax expense		15		56
Net income from discontinued operations		68		202
Distributions from unconsolidated affiliate - operating				116
Cash Distribution		47		142
Natural gas expenses, includes transportation and storage costs		14		62
Current assets						$ 594
Non-current assets						11,227
Current liabilities						1,254
Non-current liabilities						3,281
Non-controlling interest						26
Preferred equity						362
Accumulated other comprehensive loss						(1)
Enable partners’ equity						6,899
CenterPoint Energy’s ownership interest in Enable partners’ equity						3,701
CenterPoint Energy’s basis difference						(2,732)
CenterPoint Energy’s equity method investment in Enable						$ 969
Operating revenues		956		2,713
Cost of sales, excluding depreciation and amortization		565		1,510
Depreciation and amortization		104		313
Operating income		152		482
Net income attributable to Enable Common Units		107		341
CenterPoint Energy’s interest		58		183
Basis difference amortization		25		75
Discontinued Operations | Enable Midstream Partners | CERC
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Natural gas expenses, includes transportation and storage costs		$ 14		$ 62
Discontinued Operations | Enable Midstream Partners | Enable Common Units
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Distribution received (in dollars per unit)		$ 0.16525		$ 0.49575
Cash Distribution		$ 39		$ 116
Discontinued Operations | Enable Midstream Partners | Enable Series A Preferred Units
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Distribution received (in dollars per unit)		$ 0.54390		$ 1.75620
Cash Distribution		$ 8		$ 26