Related Party Transactions - Related Party Activity (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Related Party Transaction [Line Items]
Revenues from affiliated companies	$ 30	$ 38	$ 114	$ 125
Cost of natural gas purchases from affiliate	6	12	21	25
CenterPoint
Related Party Transaction [Line Items]
Cost of natural gas purchases from affiliate	0	0	1	0
CenterPoint \| Gas Transportation and Storage
Related Party Transaction [Line Items]
Revenues from affiliated companies	17	22	76	78
CenterPoint \| Gas Sales
Related Party Transaction [Line Items]
Revenues from affiliated companies	0	3	1	7
OGE Energy
Related Party Transaction [Line Items]
Cost of natural gas purchases from affiliate	6	12	20	25
OGE Energy \| Gas Transportation and Storage
Related Party Transaction [Line Items]
Revenues from affiliated companies	9	9	28	35
OGE Energy \| Gas Sales
Related Party Transaction [Line Items]
Revenues from affiliated companies	4	4	9	5
OGE Energy \| Seconded Employee Costs
Related Party Transaction [Line Items]
Seconded employee costs	$ 5	$ 4	$ 13	$ 15

Amount included in cost of sales related to transactions with related parties incurred and recorded in the statement of operations for the period.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03(2))
-URI http://asc.fasb.org/extlink&oid=120395209&loc=SL114868664-224227

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-Section 50
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Expenses recognized resulting from transactions (excluding transactions that are eliminated in consolidated or combined financial statements) with related party.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
-Topic 850
-SubTopic 10
-Section 50
-Paragraph 1
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Amount of revenue, fees and commissions earned from transactions between (a) a parent company and its subsidiaries; (b) subsidiaries of a common parent; (c) an entity and trusts for the benefit of employees, for example, but not limited to, pension and profit-sharing trusts that are managed by or under the trusteeship of the entity's management; (d) an entity and its principal, owners, management, or members of their immediate families; and (e) affiliates.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 946
-SubTopic 220
-Section S99
-Paragraph 1
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