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Amounts of material contingent liabilities, for example, but not limited to, product or environmental liabilities or litigation, that remain with the entity despite the disposal of the disposal group that is classified as a component of the entity.

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Divestitures (CenterPoint Energy and CERC) (Details) - USD ($) $ in Millions			3 Months Ended
	Jun. 01, 2020	Apr. 09, 2020	Mar. 31, 2021	Mar. 31, 2020	Jan. 31, 2021	Dec. 31, 2020
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract]
Revenues				$ 1,108
Non-utility cost of revenues				852
Operation and maintenance				183
Taxes other than income taxes				2
Total expenses				1,037
Income (loss) from Discontinued Operations before income taxes				71
Loss on classification to held for sale, net (1)				(234)
Income tax benefit			$ 0	(17)
Income (Loss) from Discontinued Operations			0	(146)
Discontinued Operation, Continuing Involvement [Abstract]
Inventory Financings			0			$ 24
Infrastructure Services Disposal Group [Member]
Discontinued Operation, Additional Disclosures [Abstract]
Cash proceeds from sale		$ 850
Receivable from sale of disposal group					$ 4
Maximum contractual exposure under Securities Purchase Agreement			21
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract]
Revenues				222
Non-utility cost of revenues				44
Operation and maintenance				163
Taxes other than income taxes				1
Total expenses				208
Income (loss) from Discontinued Operations before income taxes				14
Loss on classification to held for sale, net (1)				(96)
Income tax benefit				(5)
Income (Loss) from Discontinued Operations				(77)
Discontinued Operation, Alternative Cash Flow Information [Abstract]
Write-down of natural gas inventory				0
Capital expenditures				16
Accounts payable related to capital expenditures				2
Discontinued Operation, Continuing Involvement [Abstract]
Pipeline construction and repair services capitalized				34
Pipeline construction and repair service charges in operations and maintenance expense				1
Energy Services Disposal Group [Member]
Discontinued Operation, Additional Disclosures [Abstract]
Cash proceeds from sale	$ 286
Receivable from sale of disposal group						79
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract]
Revenues				886
Non-utility cost of revenues				808
Operation and maintenance				20
Taxes other than income taxes				1
Total expenses				829
Income (loss) from Discontinued Operations before income taxes				57
Loss on classification to held for sale, net (1)				(138)
Income tax benefit				(12)
Income (Loss) from Discontinued Operations				(69)
Discontinued Operation, Alternative Cash Flow Information [Abstract]
Write-down of natural gas inventory				3
Capital expenditures				1
Accounts payable related to capital expenditures				4
Discontinued Operation, Continuing Involvement [Abstract]
Transportation revenue				16
Natural gas expense				45
Inventory Financings			0			24
CERC Corp [Member]
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Income tax benefit			0	(11)
Income (Loss) from Discontinued Operations			0	(64)
Discontinued Operation, Continuing Involvement [Abstract]
Inventory Financings			0			24
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Discontinued Operation, Continuing Involvement [Abstract]
Pipeline construction and repair services capitalized				0
Pipeline construction and repair service charges in operations and maintenance expense				1
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Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract]
Revenues				886
Non-utility cost of revenues				808
Operation and maintenance				20
Taxes other than income taxes				1
Total expenses				829
Income (loss) from Discontinued Operations before income taxes				57
Loss on classification to held for sale, net (1)				(132)
Income tax benefit				(11)
Income (Loss) from Discontinued Operations				(64)
Discontinued Operation, Alternative Cash Flow Information [Abstract]
Write-down of natural gas inventory				3
Capital expenditures				1
Accounts payable related to capital expenditures				4
Discontinued Operation, Continuing Involvement [Abstract]
Transportation revenue				16
Natural gas expense				$ 44
Inventory Financings			$ 0			$ 24