Regulatory Matters (Schedule of Regulatory Assets) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Regulatory Assets [Line Items]
Regulatory Assets	$ 3,727us-gaap_RegulatoryAssets	$ 2,863us-gaap_RegulatoryAssets
Regulatory Assets, Current	(76)us-gaap_RegulatoryAssetsCurrent	(26)us-gaap_RegulatoryAssetsCurrent
Regulatory Assets, Noncurrent	3,651us-gaap_RegulatoryAssetsNoncurrent	2,837us-gaap_RegulatoryAssetsNoncurrent
Securitized Regulatory Assets, Noncurrent	34	231
Pension Costs [Member]
Regulatory Assets [Line Items]
Regulatory Assets	2,284	1,660
Postretirment Costs [Member]
Regulatory Assets [Line Items]
Regulatory Assets	234	0
Asset Retirement Obligation Costs [Member]
Regulatory Assets [Line Items]
Regulatory Assets	448	394
Recoverable Michigan Income Taxes [Member]
Regulatory Assets [Line Items]
Regulatory Assets	267	286
Unamortized Loss on Reacquired Debt [Member]
Regulatory Assets [Line Items]
Regulatory Assets	67	63
Other Recoverabe Income Taxes [Member]
Regulatory Assets [Line Items]
Regulatory Assets	66	71
Accrued PSCR/GCR Revenue [Member]
Regulatory Assets [Line Items]
Regulatory Assets	61	0
Deferred Environmental Costs [Member]
Regulatory Assets [Line Items]
Regulatory Assets	59	59
Cost to Achieve Performance Excellence Process [Member]
Regulatory Assets [Line Items]
Regulatory Assets	54	75
Recoverable Income Taxes related to Securitized Regulatory Assets [Member]
Regulatory Assets [Line Items]
Regulatory Assets	19	126
Unrecovered Removal Costs [Member]
Regulatory Assets [Line Items]
Regulatory Assets	15	0
Transitional Recovery Mechanism [Member]
Regulatory Assets [Line Items]
Regulatory Assets	14	0
Other Assets [Member]
Regulatory Assets [Line Items]
Regulatory Assets	$ 139	$ 129

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The amount for the individual regulatory asset as itemized in a table of regulatory assets as of the end of the period.

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- Definition

Carrying amount as of the balance sheet date of capitalized costs of regulated entities that are expected to be recovered through revenue sources within one year or the normal operating cycle, if longer. Such costs are capitalized if they meet both of the following criteria: a. It is probable that future revenue in an amount at least equal to the capitalized cost will result from inclusion of that cost in allowable costs for rate-making purposes. b. Based on available evidence, the future revenue will be provided to permit recovery of the previously incurred cost rather than to provide for expected levels of similar future costs. If the revenue will be provided through an automatic rate-adjustment clause, this criterion requires that the regulator's intent clearly be to permit recovery of the previously incurred cost.

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Carrying amount as of the balance sheet date of capitalized costs of regulated entities that are not expected to be recovered through revenue sources within one year or the normal operating cycle if longer.

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Carrying value of the regulatory asset that represents capitalized stranded costs that have been securitized (financed with debt) and are expected to be recoverable through a transition charge after one year (or beyond the operating cycle if longer). A transition charge is a charge approved by a regulator that allows deregulated utilities to recover investments in certain assets, such as power plants, over a transition period leading into a deregulated market.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 980

-SubTopic 340

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6499975&loc=d3e44250-110382

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 860

-SubTopic 10

-Section 55

-Paragraph 7

-URI http://asc.fasb.org/extlink&oid=45353962&loc=d3e99978-111710

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