STATEMENTS OF CONSOLIDATED CASH FLOWS (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Cash Flows from Operating Activities:
Net income	$ 323us-gaap_NetIncomeLoss	$ 64us-gaap_NetIncomeLoss	$ 137us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	206	230	285
Amortization of deferred financing costs	9us-gaap_AmortizationOfFinancingCosts	11us-gaap_AmortizationOfFinancingCosts	13us-gaap_AmortizationOfFinancingCosts
Deferred income taxes	178us-gaap_DeferredIncomeTaxExpenseBenefit	357us-gaap_DeferredIncomeTaxExpenseBenefit	245us-gaap_DeferredIncomeTaxExpenseBenefit
Goodwill impairment	0us-gaap_GoodwillImpairmentLoss	0us-gaap_GoodwillImpairmentLoss	252us-gaap_GoodwillImpairmentLoss
Step acquisition gain	0	0	(136)
Write-down of natural gas inventory	8us-gaap_InventoryWriteDown	4us-gaap_InventoryWriteDown	4us-gaap_InventoryWriteDown
Equity in earnings of unconsolidated affiliates, net of distributions	(2)	(58)	8
Changes in other assets and liabilities:
Accounts receivable and unbilled revenues, net	7	(220)	6
Accounts receivable/payable, affiliates	1	(2)	5
Inventory	(81)us-gaap_IncreaseDecreaseInInventories	(10)us-gaap_IncreaseDecreaseInInventories	41us-gaap_IncreaseDecreaseInInventories
Taxes receivable	18	(18)	1
Accounts payable	17	110	2
Fuel cost recovery	(41)	108	(52)
Interest and taxes accrued	(3)	33	(11)
Non-trading derivatives, net	(34)	4	19
Margin deposits, net	(79)	16	53
Other current assets	8	3	(10)
Other current liabilities	(6)	5	8
Other assets	(11)	(18)	(13)
Other liabilities	11	6	(28)
Other, net	6	10	7
Net cash provided by operating activities	535	635	836
Cash Flows from Investing Activities:
Capital expenditures, net of acquisitions	(512)	(495)	(566)
Acquisitions, net of cash acquired	0	0	(360)
Investment in unconsolidated affiliates	(1)	0	(5)
Cash contribution to Enable	0cerc_CashContributed	(38)cerc_CashContributed	0cerc_CashContributed
Other, net	0	(3)	8
Net cash used in investing activities	(513)	(536)	(923)
Cash Flows from Financing Activities:
Increase (decrease) in short-term borrowings, net	10	5	(24)
Proceeds from (payments of) commercial paper, net	223	118	(285)
Proceeds from long-term debt	0	1,050	0
Payments of long-term debt	0us-gaap_RepaymentsOfLongTermDebt	(525)us-gaap_RepaymentsOfLongTermDebt	0us-gaap_RepaymentsOfLongTermDebt
Cash paid for debt exchange	0	(5)	0
Dividends to parent	(405)us-gaap_PaymentsOfDividends	0us-gaap_PaymentsOfDividends	0us-gaap_PaymentsOfDividends
Increase (decrease) in notes payable to affiliates	150	(741)	396
Other, net	1	(1)	0
Net cash provided by (used in) financing activities	(21)	(99)	87
Net Increase in Cash and Cash Equivalents	1	0	0
Cash and Cash Equivalents at Beginning of the Year	1	1	1
Cash and Cash Equivalents at End of the Year	2	1	1
Cash Payments:
Interest, net of capitalized interest	128us-gaap_InterestPaidNet	148us-gaap_InterestPaidNet	163us-gaap_InterestPaidNet
Income taxes (refunds), net	(1)us-gaap_IncomeTaxesPaidNet	(5)us-gaap_IncomeTaxesPaidNet	3us-gaap_IncomeTaxesPaidNet
Non-cash transactions:
Accounts payable related to capital expenditures	37	21	60
Formation of Enable	0us-gaap_ContributionOfProperty		0us-gaap_ContributionOfProperty
Transfer from Investments		0us-gaap_TransferOfInvestments	0us-gaap_TransferOfInvestments
Exercise of SESH put to Enable [Member]
Non-cash transactions:
Transfer from Investments	196
Formation of Enable [Member]
Non-cash transactions:
Formation of Enable		$ 4,252

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Future cash outflow to pay for purchases of fixed assets that have occurred.

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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Value of property contributed in noncash investing and financing activities.

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Amount of deferred income tax expense (benefit) pertaining to income (loss) from continuing operations.

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Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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This element represents the undistributed income (or loss) of equity method investments, net of dividends or other distributions received from unconsolidated subsidiaries, certain corporate joint ventures, and certain noncontrolled corporations; such investments are accounted for under the equity method of accounting. This element excludes distributions that constitute a return of investment, which are classified as investing activities.

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The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income, net of any cash received during the current period as refunds for the overpayment of taxes.

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The increase (decrease) during the reporting period in money or securities placed with a broker or counterparty as security for a trading or derivative position.

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The increase (decrease) during the reporting period in the amount owed by the reporting entry in the form of loans and obligations (generally evidenced by promissory notes) made by the following types of related parties: a parent company and its subsidiaries; subsidiaries of a common parent; an entity and trust for the benefit of employees, such as pension and profit-sharing trusts that are managed by or under the trusteeship of the entity's management, an entity and its principal owners, management, or member of their immediate families, affiliates, or other parties with the ability to exert significant influence.

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The increase (decrease) during the reporting period in other current operating assets not separately disclosed in the statement of cash flows.

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The increase (decrease) during the reporting period in the value of the asset or liability created by an over or under recovery. An over under-recovery means that the basic energy price based on the daily product price and exchange rate is less (over) or more (under) than the basic energy price used in the calculation of the monthly retail energy product.

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The amount of cash paid for interest during the period net of cash paid for interest that is capitalized.

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Charge to cost of goods sold that represents the reduction of the carrying amount of inventory, generally attributable to obsolescence or market conditions.

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