DTE Energy (DTE) 10-K 23 Feb 10 2009 FY Annual report Financial data

Document and Company Informatio

Document and Company Information (USD $)
	12 Months Ended Dec. 31, 2009	Jan. 31, 2010
Document And Company Information [Abstract]
Entity Registrant Name	DTE ENERGY CO
Entity Central Index Key	0000936340
Document Type	10-K
Document Period End Date	2009-12-31
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Filer Category	Large Accelerated Filer
Entity Public Float	$7,193,160,469
Entity Common Stock, Shares Outstanding		165,633,622

Consolidated Statements of Oper

Consolidated Statements of Operations (USD $)
In Millions, except Per Share data	12 Months Ended Dec. 31, 2009	12 Months Ended Dec. 31, 2008	12 Months Ended Dec. 31, 2007
Consolidated Statements of Operations [Abstract]
Operating Revenues	$8,014	$9,329	$8,475
Operating Expenses
Fuel, purchased power and gas	3,118	4,306	3,552
Operation and maintenance	2,372	2,694	2,892
Depreciation, depletion and amortization	1,020	901	932
Taxes other than income	275	304	357
Gain on sale of non-utility business	0	(128)	(900)
Other asset (gains) and losses, reserves and impairments, net	(20)	(11)	37
Total Operating Expenses	6,765	8,066	6,870
Operating Income	1,249	1,263	1,605
Other (Income) and Deductions
Interest expense	545	503	533
Interest income	(19)	(19)	(25)
Other income	(102)	(104)	(93)
Other expenses	43	64	35
Total Other (Income) and Deductions	467	444	450
Income Before Income Taxes	782	819	1,155
Income Tax Provision	247	288	364
Income from Continuing Operations	535	531	791
Discontinued Operations Income (Loss), net of tax	0	22	(4)
Net Income	535	553	787
Less: Net Income (Loss) Attributable to Noncontrolling Interests From
Continuing operations	3	5	4
Discontinued operations	0	2	(188)
Total Net Income (Loss) Attributable to the Noncontrolling Interest	3	7	(184)
Net Income Attributable to DTE Energy Company	$532	$546	$971
Basic Earnings per Common Share
Income from continuing operations	3.24	3.22	4.62
Discontinued operations	$0	0.12	1.08
Total	3.24	3.34	5.7
Diluted Earnings Per Common Share
Income from continuing operations	3.24	3.22	4.61
Discontinued operations	$0	0.12	1.08
Total	3.24	3.34	5.69
Weighted Average Common Shares Outstanding
Basic	164	163	170
Diluted	164	163	171
Dividends Declared per Common Share	2.12	2.12	2.12

Consolidated Statements of Fina

Consolidated Statements of Financial Position (USD $)
In Millions	Dec. 31, 2009	Dec. 31, 2008
Current Assets
Cash and cash equivalents	$52	$86
Restricted cash	84	86
Accounts receivable (less allowance for doubtful accounts of $262 and $265, respectively)
Customer	1,438	1,666
Other	217	166
Inventories
Fuel and gas	309	333
Materials and supplies	200	206
Deferred income taxes	167	227
Derivative assets	209	316
Other	201	242
Total Current Assets	2,877	3,328
Investments
Nuclear decommissioning trust funds	817	685
Other	598	595
Total Investments	1,415	1,280
Property
Property, plant and equipment	20,588	20,065
Less accumulated depreciation, depletion and amortization	(8,157)	(7,834)
Total Property, Plant and Equipment	12,431	12,231
Other Assets
Goodwill	2,024	2,037
Regulatory assets	4,110	4,231
Securitized regulatory assets	870	1,001
Intangible assets	54	70
Notes receivable	113	115
Derivative assets	116	140
Other	185	157
Total Noncurrent Assets	7,472	7,751
Total Assets	24,195	24,590
Current Liabilities
Accounts payable	723	899
Accrued interest	114	119
Dividends payable	88	86
Short-term borrowings	327	744
Current portion long-term debt, including capital leases	671	362
Derivative liabilities	220	285
Other	502	518
Total Current Liabilities	2,645	3,013
Long-Term Debt (net of current portion)
Mortgage bonds, notes and other	6,237	6,458
Securitization bonds	793	932
Trust preferred-linked securities	289	289
Capital lease obligations	51	62
Total Long-Term Debt (net of current portion)	7,370	7,741
Other Liabilities
Deferred income taxes	2,096	1,958
Regulatory liabilities	1,337	1,202
Asset retirement obligations	1,420	1,340
Unamortized investment tax credit	85	96
Derivative liabilities	198	344
Liabilities from transportation and storage contracts	96	111
Accrued pension liability	881	871
Accrued postretirement liability	1,287	1,434
Nuclear decommissioning	136	114
Other	328	328
Total Noncurrent Liabilities	7,864	7,798
Equity
Common stock, without par value, 400,000,000 shares authorized, 165,400,045 and 163,019,596 shares issued and outstanding, respectively	3,257	3,175
Retained earnings	3,168	2,985
Accumulated other comprehensive loss	(147)	(165)
Total DTE Energy Company Shareholders' Equity	6,278	5,995
Noncontrolling interests	38	43
Total Equity	6,316	6,038
Total Liabilities and Equity	$24,195	$24,590

1_Consolidated Statements of Fi

Consolidated Statements of Financial Position (Parenthetical) (USD $)
In Millions, except Share data	Dec. 31, 2009	Dec. 31, 2008
Current Assets
Allowance for doubtful accounts	$262	$265
Equity
Common stock, without par value	0	0
Common stock, shares authorized	400,000,000	400,000,000
Common stock, shares issued	165,400,045	163,019,596
Common stock, shares outstanding	165,400,045	163,019,596

Consolidated Statements of Cash

Consolidated Statements of Cash Flows (USD $)
In Millions	12 Months Ended Dec. 31, 2009	12 Months Ended Dec. 31, 2008	12 Months Ended Dec. 31, 2007
Operating Activities
Net income	$535	$553	$787
Adjustments to reconcile net income to net cash from operating activities:
Depreciation, depletion and amortization	1,020	899	926
Deferred income taxes	205	348	144
Gain on sale of non-utility business	0	(128)	(900)
Other asset (gains), losses and reserves, net	(10)	(4)	(9)
Gain on sale of interests in synfuel projects	0	(31)	(248)
Impairment of synfuel projects	0	0	4
Contributions from synfuel partners	0	14	229
Changes in assets and liabilities, exclusive of changes shown separately (Note 23)	69	(92)	192
Net cash from operating activities	1,819	1,559	1,125
Investing Activities
Plant and equipment expenditures - utility	(960)	(1,183)	(1,035)
Plant and equipment expenditures - non-utility	(75)	(190)	(264)
Proceeds from sale of interests in synfuel projects	0	84	447
Refunds to synfuel partners	0	(387)	(115)
Proceeds from sale of non-utility business	0	253	1,262
Proceeds from sale of other assets, net	83	25	85
Restricted cash for debt redemption	2	54	6
Proceeds from sale of nuclear decommissioning trust fund assets	295	232	286
Investment in nuclear decommissioning trust funds	(315)	(255)	(323)
Other investments	(94)	(156)	(19)
Net cash from (used) for investing activities	(1,064)	(1,523)	330
Financing Activities
Issuance of long-term debt	427	1,310	50
Redemption of long-term debt	(486)	(446)	(393)
Repurchase of long-term debt	0	(238)	0
Short-term borrowings, net	(417)	(340)	(47)
Issuance of common stock	35	0	0
Repurchase of common stock	0	(16)	(708)
Dividends on common stock	(348)	(344)	(364)
Other	0	(10)	(6)
Net cash used for financing activities	(789)	(84)	(1,468)
Net Decrease in Cash and Cash Equivalents	(34)	(48)	(13)
Cash and Cash Equivalents Reclassified (to) from Assets Held for Sale	0	11	(11)
Cash and Cash Equivalents at Beginning of Period	86	123	147
Cash and Cash Equivalents at End of Period	$52	$86	$123

Consolidated Statements of Chan

Consolidated Statements of Changes in Shareholders Equity and Comprehensive Income (USD $)
In Millions, except Share data in Thousands	Common Stock	Retained Earnings	Accumulated Other Comprehensive Loss	Noncontrolling Interest	Total
Beginning Balance, shares at Dec. 31, 2006	177,138
Beginning Balance at Dec. 31, 2006	$3,467	$2,593	($211)	$42	$5,891
Net income		971		(184)	787
Implementation of ASC 740 (FIN 48)		(5)			(5)
Dividends declared on common stock		(358)			(358)
Repurchase and retirement of common stock	(297)	(411)			(708)
Repurchase and retirement of common stock, shares	(14,440)
Benefit obligations, net of tax			6		6
Net change in unrealized losses on derivatives, net of tax			91		91
Net change in unrealized losses on investments, net of tax			1		1
Contributions from noncontrolling interests				229	229
Stock-based compensation, distributions to noncontrolling interests and other	6			(39)	(33)
Stock-based compensation, distributions to noncontrolling interests and other, shares	534
Ending Balance at Dec. 31, 2007	3,176	2,790	(113)	48	5,901
Ending Balance, shares at Dec. 31, 2007	163,232
Net income		546		7	553
Implementation of ASC 820 (SFAS No. 157), net of tax		4			4
Implementation of ASC 715 (SFAS No. 158) measurement date provision, net of tax		(9)			(9)
Dividends declared on common stock		(346)			(346)
Repurchase and retirement of common stock	(16)				(16)
Repurchase and retirement of common stock, shares	(479)
Benefit obligations, net of tax			(22)		(22)
Foreign currency translation, net of tax			(2)		(2)
Net change in unrealized losses on derivatives, net of tax			6		6
Net change in unrealized losses on investments, net of tax			(34)		(34)
Contributions from noncontrolling interests				14	14
Stock-based compensation, distributions to noncontrolling interests and other	15			(26)	(11)
Stock-based compensation, distributions to noncontrolling interests and other, shares	267
Ending Balance at Dec. 31, 2008	3,175	2,985	(165)	43	6,038
Ending Balance, shares at Dec. 31, 2008	163,020				163,020
Net income		532		3	535
Dividends declared on common stock		(349)			(349)
Issuance of common stock	35				35
Issuance of common stock, shares	1,109
Benefit obligations, net of tax			7		7
Foreign currency translation, net of tax			2		2
Net change in unrealized losses on derivatives, net of tax			1		1
Net change in unrealized losses on investments, net of tax			8		8
Contributions from noncontrolling interests				4	4
Stock-based compensation, distributions to noncontrolling interests and other	47			(12)	35
Stock-based compensation, distributions to noncontrolling interests and other, shares	1,271
Ending Balance at Dec. 31, 2009	$3,257	$3,168	($147)	$38	$6,316
Ending Balance, shares at Dec. 31, 2009	165,400				165,400

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income (USD $)
In Millions	12 Months Ended Dec. 31, 2009	12 Months Ended Dec. 31, 2008	12 Months Ended Dec. 31, 2007
Consolidated Statements of Comprehensive Income [Abstract]
Net income	$535	$553	$787
Other comprehensive income (loss), net of tax:
Foreign exchange translation, net of taxes of $1, $(1) and $-	2	(2)	0
Benefit obligations, net of taxes of $4, $(12) and $3	7	(22)	6
Net unrealized gains (losses) on derivatives:
Gains (losses) arising during the period, net of taxes of $2, $2 and $(76)	3	4	(141)
Amounts reclassified to income, net of taxes of $(1), $1, and $125	(2)	2	232
Net unrealized gains (losses) on derivatives	1	6	91
Net unrealized gains (losses) on investments:
Gains (losses) during the period, net of taxes of $3, $(19) and $2	5	(34)	4
Amounts reclassified to income, net of taxes of $2, $- and $(2)	3	0	(3)
Net unrealized gains (losses) on investments	8	(34)	1
Comprehensive income	553	501	885
Less: Comprehensive income (loss) attributable to noncontrolling interests	3	7	(184)
Comprehensive income attributable to DTE Energy Company	$550	$494	$1,069

2_Consolidated Statements of Co

Consolidated Statements of Comprehensive Income (Parenthetical) (USD $)
In Millions	12 Months Ended Dec. 31, 2009	12 Months Ended Dec. 31, 2008	12 Months Ended Dec. 31, 2007
Other comprehensive income (loss), net of tax:
Tax effect on foreign exchange translation	$1	($1)	$0
Tax effect on benefit obligations	4	(12)	3
Net unrealized gains (losses) on derivatives:
Tax effect on gains (losses) during the period	2	2	(76)
Tax effect on amounts reclassified to income	(1)	1	125
Net unrealized gains (losses) on investments:
Tax effect on gains (losses) arising during the period	3	(19)	2
Tax effect on amounts reclassified to income	$2	$0	($2)

Organization and Basis of Prese

Organization and Basis of Presentation
	12 Months Ended Dec. 31, 2009 USD / shares
Organization and Basis of Presentation [Abstract]
Organization and Basis of Presentation	NOTE1 ORGANIZATION AND BASIS OF PRESENTATION Corporate Structure DTE Energy owns the following businesses: Detroit Edison, an electric utility engaged in the generation, purchase, distribution and sale of electric energy to approximately 2.1million customers in southeast Michigan; MichCon, a natural gas utility engaged in the purchase, storage, transmission, distribution and sale of natural gas to approximately 1.2million customers throughout Michigan;and Other segments are involved in 1)natural gas pipelines and storage; 2)unconventional gas project development and production; 3)power and industrial projects and coal transportation and marketing; and 4)energy marketing and trading operations. Detroit Edison and MichCon are regulated by the MPSC. The FERC regulates certain activities of Detroit Edisons business as well as various other aspects of businesses under DTE Energy. In addition, the Company is regulated by other federal and state regulatory agencies including the NRC, the EPA and MDEQ. References in this report to Company or DTE are to DTE Energy and its subsidiaries, collectively. Basis of Presentation The accompanying consolidated financial statements are prepared using accounting principles generally accepted in the United States of America. These accounting principles require management to use estimates and assumptions that impact reported amounts of assets, liabilities, revenues and expenses, and the disclosure of contingent assets and liabilities. Actual results may differ from the Companys estimates. Certain prior year balances were reclassified to match the current years financial statement presentation. Principles of Consolidation The Company consolidates all majority owned subsidiaries and investments in entities in which it has controlling influence. Non-majority owned investments are accounted for using the equity method when the Company is able to influence the operating policies of the investee. Non-majority owned investments include investments in limited liability companies, partnerships or joint ventures. When the Company does not influence the operating policies of an investee, the cost method is used. These consolidated financial statements also reflect the Companys proportionate interests in certain jointly owned utility plant. The Company eliminates all intercompany balances and transactions. We consolidate variable interest entities (VIEs) for which we are the primary beneficiary. In general, we determine whether we are the primary beneficiary of a VIE through a qualitative analysis of risk which indentifies which variable interest holder absorbs the majority of the financial risk or rewards and variability of the VIE. In performing this analysis, we consider all relevant facts and circumstances, including: the design and activities of the VIE, the terms of the contracts the VIE has entered into, the identification of variable interest holders including equity owners, customers, suppliers and debt holders and which parties participated significantly in the design of the entity. If the qualitative analysis is inconclus

Significant Accounting Policies

Significant Accounting Policies
	12 Months Ended Dec. 31, 2009 USD / shares
Significant Accounting Policies [Abstract]
Significant Accounting Policies	NOTE2 SIGNIFICANT ACCOUNTING POLICIES Revenues Revenues from the sale and delivery of electricity, and the sale, delivery and storage of natural gas are recognized as services are provided. Detroit Edison and MichCon record revenues for electric and gas provided but unbilled at the end of each month. Detroit Edisons accrued revenues include a component for the cost of power sold that is recoverable through the PSCR mechanism. MichCons accrued revenues include a component for the cost of gas sold that is recoverable through the GCR mechanism. Annual PSCR and GCR proceedings before the MPSC permit Detroit Edison and MichCon to recover prudent and reasonable supply costs. Any overcollection or undercollection of costs, including interest, will be reflected in future rates. See Note12. Non-utility businesses recognize revenues as services are provided and products are delivered. Revenues and energy costs related to trading contracts are presented on a net basis in the Consolidated Statements of Operations. Commodity derivatives used for trading purposes are accounted for using the mark-to-market method with unrealized gains and losses recorded in Operating Revenues. Accounting for ISO Transactions Detroit Edison participates in the energy market through MISO. MISO requires that we submit hourly day-ahead, real time and FTR bids and offers for energy at locations across the MISO region. Detroit Edison accounts for MISO transactions on a net hourly basis in each of the day-ahead, real-time and FTR markets and net transactions across all MISO energy market locations. We record net purchases in a single hour in fuel, purchased power and gas and net sales in a single hour in operating revenues in the Consolidated Statements of Income. We record net sale billing adjustments when we receive invoices. We record expense accruals for future net purchases adjustments base on historical experience, and reconcile accruals to actual expenses when we receive invoices. Energy Trading participates in the energy markets through MISO, PJM and ISO-NE. These markets require that we submit hourly day-ahead, real time bids and offers for energy at locations across each RTO region. We submit bids in the annual and monthly auction revenue rights and FTR auctions for the all the RTOs. Energy Trading accounts for these transactions on a net hourly basis for the day-ahead, real-time and FTR markets. These transactions are related to our trading contracts which are presented on a net basis in operating revenues in the Consolidated Statements of Income. Comprehensive Income Comprehensive income is the change in Common shareholders equity during a period from transactions and events from non-owner sources, including net income. As shown in the following table, amounts recorded to Other comprehensive income for the year ended December31, 2009 include unrealized gains and losses from derivatives accounted for as cash flow hedges, unrealized gains and losses on available for sale securities, and changes in benefit obligations, consisting of deferred actuarial losses, prior service costs and transition amounts related to pensi

New Accounting Pronouncements

New Accounting Pronouncements
	12 Months Ended Dec. 31, 2009 USD / shares
New Accounting Pronouncements [Abstract]
New Accounting Pronouncements	NOTE3 NEW ACCOUNTING PRONOUNCEMENTS FASB Accounting Standards Codificationtm(Codification) On July1, 2009, the Codification became the single source of authoritative nongovernmental generally accepted accounting principles (GAAP) in the United States of America. The Codification is a reorganization of current GAAP into a topical format that eliminates the current GAAP hierarchy and establishes two levels of guidance authoritative and non-authoritative. According to the FASB, all non-grandfathered, non-SEC accounting literature that is not included in the Codification would be considered non-authoritative. The FASB has indicated that the Codification does not change current GAAP. Instead, the proposed changes aim to (1)reduce the time and effort it takes for users to research accounting questions and (2)improve the usability of current accounting standards. The Codification is effective for interim and annual periods ending after September15, 2009. Fair Value Accounting In September 2006, the FASB issued ASC 820 (SFASNo.157, Fair Value Measurements). The standard defines fair value, establishes a framework for measuring fair value in generally accepted accounting principles, and expands disclosures about fair value measurements. It emphasizes that fair value is a market-based measurement, not an entity-specific measurement. Fair value measurement should be determined based on the assumptions that market participants would use in pricing an asset or liability. Effective January1, 2008, the Company adopted ASC 820 (SFASNo.157). The cumulative effect adjustment upon adoption of ASC 820 represented a $4million increase to the January1, 2008 balance of retained earnings. As permitted by ASC 820-10 (FSP No.157-2), the Company elected to defer the effective date of the standard as it pertains to measurement and disclosures about the fair value of non-financial assets and liabilities made on a nonrecurring basis. The Company has adopted the recognition provisions for non-financial assets and liabilities as of January1, 2009. See Note4. In April 2009, the FASB issued three FSPs intended to provide additional application guidance and enhance disclosures regarding fair value measurements and impairments of securities. The FSPs are effective for interim and annual periods ending after June15, 2009. ASC 825-10 (FSP No.107-1 and APB No.28-1), Interim Disclosures about Fair Value of Financial Instruments, expands the fair value disclosures required for all financial instruments within the scope of ASC 825-10 to interim periods. ASC 820-10 (FSP No.157-4), Determining Fair Value When the Volume and Level of Activity for the Asset or Liability Have Significantly Decreased and Identifying Transactions That Are Not Orderly, which applies to all assets and liabilities, i.e., financial and nonfinancial, reemphasizes that the objective of fair value remains unchanged (i.e., an exit price notion). The FSP provides application guidance on measuring fair value when the volume and level of activity has significantly decreased and identifying transactions that are not orderly. The FSP also emphasizes that an entity

Fair Value

Fair Value
	12 Months Ended Dec. 31, 2009 USD / shares
Fair Value [Abstract]
Fair Value	NOTE4 FAIR VALUE Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date in a principal or most advantageous market. Fair value is a market-based measurement that is determined based on inputs, which refer broadly to assumptions that market participants use in pricing assets or liabilities. These inputs can be readily observable, market corroborated or generally unobservable inputs. The Company makes certain assumptions it believes that market participants would use in pricing assets or liabilities, including assumptions about risk, and the risks inherent in the inputs to valuation techniques. Credit risk of the Company and its counterparties is incorporated in the valuation of assets and liabilities through the use of credit reserves, the impact of which is immaterial for the years ended December31, 2009 and 2008. The Company believes it uses valuation techniques that maximize the use of observable market-based inputs and minimize the use of unobservable inputs. A fair value hierarchy has been established, which prioritizes the inputs to valuation techniques used to measure fair value in three broad levels. The fair value hierarchy gives the highest priority to quoted prices (unadjusted) in active markets for identical assets or liabilities (Level1)and the lowest priority to unobservable inputs (Level3). In some cases, the inputs used to measure fair value might fall in different levels of the fair value hierarchy. All assets and liabilities are required to be classified in their entirety based on the lowest level of input that is significant to the fair value measurement in its entirety. Assessing the significance of a particular input may require judgment considering factors specific to the asset or liability, and may affect the valuation of the asset or liability and its placement within the fair value hierarchy. The Company classifies fair value balances based on the fair value hierarchy defined as follows: Level1 Consists of unadjusted quoted prices in active markets for identical assets or liabilities that the Company has the ability to access as of the reporting date. Level2 Consists of inputs other than quoted prices included within Level1 that are directly observable for the asset or liability or indirectly observable through corroboration with observable market data. Level3 Consists of unobservable inputs for assets or liabilities whose fair value is estimated based on internally developed models or methodologies using inputs that are generally less readily observable and supported by little, if any, market activity at the measurement date. Unobservable inputs are developed based on the best available information and subject to cost-benefit constraints. The following table presents assets and liabilities measured and recorded at fair value on a recurring basis as of December31, 2009: Netting Net Balance at Level 1 Level 2 Level 3 Adjustments

Financial and Other Derivative

Financial and Other Derivative Instruments
	12 Months Ended Dec. 31, 2009 USD / shares
Financial and Other Derivative Instruments [Abstract]
Financial and Other Derivative Instruments	NOTE5 FINANCIAL AND OTHER DERIVATIVE INSTRUMENTS The Company recognizes all derivatives on the Consolidated Statements of Financial Position at their fair value unless they qualify for certain scope exceptions, including the normal purchases and normal sales exception. Further, derivatives that qualify and are designated for hedge accounting are classified as either hedges of a forecasted transaction or the variability of cash flows to be received or paid related to a recognized asset or liability (cash flow hedge), or as hedges of the fair value of a recognized asset or liability or of an unrecognized firm commitment (fair value hedge). For cash flow hedges, the portion of the derivative gain or loss that is effective in offsetting the change in the value of the underlying exposure is deferred in Accumulated other comprehensive income and later reclassified into earnings when the underlying transaction occurs. For fair value hedges, changes in fair values for the derivative are recognized in earnings each period. Gains and losses from the ineffective portion of any hedge are recognized in earnings immediately. For derivatives that do not qualify or are not designated for hedge accounting, changes in the fair value are recognized in earnings each period. The Companys primary market risk exposure is associated with commodity prices, credit, interest rates and foreign exchange. The Company has risk management policies to monitor and manage market risks. The Company uses derivative instruments to manage some of the exposure. The Company uses derivative instruments for trading purposes in its Energy Trading segment and the coal marketing activities of its Power and Industrial Projects segment. Contracts classified as derivative instruments include power, gas, oil and certain coal forwards, futures, options and swaps, and foreign exchange contracts. Items not classified as derivatives include proprietary gas inventory, gas storage and transportation arrangements, and gas and oil reserves. Derivatives are generally recorded at fair value and shown as Derivative assets or liabilities on the Consolidated Statements of Financial Position. Electric Utility Detroit Edison generates, purchases, distributes and sells electricity. Detroit Edison uses forward energy and capacity contracts to manage changes in the price of electricity and fuel. Substantially all of these contracts meet the normal purchases and sales exemption and are therefore accounted for under the accrual method. Other derivative contracts are recoverable through the PSCR mechanism when settled. This results in the deferral of unrealized gains and losses as Regulatory assets or liabilities, until realized. Gas Utility MichCon purchases, stores, transports and distributes natural gas and sells storage and transportation capacity. MichCon has fixed-priced contracts for portions of its expected gas supply requirements through 2013. These gas-supply contracts are designated and qualify for the normal purchases and sales exemption and are therefore accounted for under the accrual method. MichCon may also sell forward storage and transportation capacity contracts. Forw

Goodwill

Goodwill
	12 Months Ended Dec. 31, 2009 USD / shares
Goodwill [Abstract]
Goodwill	NOTE6 GOODWILL The Company has goodwill resulting from purchase business combinations. The change in the carrying amount of goodwill for the fiscal years ended December31, 2009 and December31, 2008 is as follows: 2009 2008 (in Millions) Balance as of January 1 $ 2,037 $ 2,037 Allocated goodwill attributable to sale of Gas Utility subsidiaries (13 ) Balance at December 31 $ 2,024 $ 2,037 In the period from October1, 2008 to March31, 2009, DTE Energys stock price declined 31percent and at March31, 2009 was approximately 26percent below its book value per share of $37.29. We deemed the duration and severity of the decline in DTE Energys stock price to be a triggering event to test for potential goodwill impairment for the first quarter. In performing Step 1 of the impairment test, we compared the fair value of the reporting unit to its carrying value including goodwill. All reporting units passed Step 1 of the impairment test. For the quarters ended June30, 2009 and September30, 2009, DTE Energys closing stock price increased 16percent and 27percent, respectively, as compared to the closing stock price at March31, 2009. Although DTE Energy was still trading at a discount to book value at the end of the third quarter, the discount improved to 7percent at September30, 2009 from 26percent at March31, 2009. In assessing whether the continuing discount to book value was an indication of impairment, we considered the following factors: (1)the severity of the decline in DTE Energys share price experienced since the fourth quarter of 2008 had diminished and was continuing to recover; and (2)the assumptions incorporated in the first quarter impairment test had either improved or had not changed significantly during the second and third quarters such that they would change the results of Step 1. As a result of this assessment, we determined that the continuing discount to book value was not a triggering event for impairment testing purposes for the second and third quarters. We did, however, identify a goodwill impairment test trigger for our Energy Services reporting unit related to the long-lived asset impairment tests that were performed during the second quarter of 2009 on certain automotive-related project companies. Accordingly, we performed an interim goodwill impairment test for Energy Services as of June30, 2009. The fair value of the reporting unit exceeded its carrying value including goodwill. Therefore, the reporting unit passed Step 1 of the impairment test. No new trigger was identified during the third quarter of 2009. We performed our annual goodwill impairment test as of October1, 2009 and determined that the estimated fair value of each reporting unit exceeded its carrying value, and no impairment existed. We performed our valuations in accordance with the requirements for measuring nonrecurring, nonfinancial assets and liabilities. DTE Energys stock price continued to improve during the fourth quarter, and as of December31, 2009, it closed

Property, Plant and Equipment

Property, Plant and Equipment
	12 Months Ended Dec. 31, 2009 USD / shares
Property, Plant and Equipment [Abstract]
Property, Plant and Equipment	NOTE7 PROPERTY, PLANT AND EQUIPMENT Summary of property by classification as of December 31: 2009 2008 (in Millions) Property, Plant and Equipment Electric Utility Generation $ 8,833 $ 8,544 Distribution 6,618 6,433 Total Electric Utility 15,451 14,977 Gas Utility Distribution 2,386 2,327 Storage 383 378 Other 1,013 1,090 Total Gas Utility 3,782 3,795 Non-utility and other 1,355 1,293 Total 20,588 20,065 Less Accumulated Depreciation, Depletion and Amortization Electric Utility Generation (3,890 ) (3,690 ) Distribution (2,243 ) (2,138 ) Total Electric Utility (6,133 ) (5,828 ) Gas Utility Distribution (972 ) (955 ) Storage (113 ) (107 ) Other (543 ) (603 ) Total Gas Utility (1,628 ) (1,665 ) Non-utility and other (396 ) (341 ) Total (8,157 ) (7,834 ) Net Property, Plant and Equipment $ 12,431 $ 12,231 AFUDC capitalized during 2009 and 2008 was approximately $14million and $50million, respectively. The composite depreciation rate for Detroit Edison was 3.3% in 2009, 2008 and 2007. The composite depreciation rate for MichCon was 3.1% in 2009, 3.2% in 2008 and 3.1% in 2007. The average estimated useful life for each major class of utility property, plant and equipment as of December31, 2009 follows: Estimated Useful Lives in Years Utility Generation Distribution Transmission Electric 40 37 N/A Gas N/A 40 37 The estimated useful lives for major classes of non-utility assets and facilities ranges from 3 to 55years. Capitalized software costs amortization expense was $66million in 2009, $54million in 2008 and $42million in 2007. The gross carrying amount and accumulated amortization of capitalized software costs at December31, 2009 were $613million and $234million, respectively. The gross carrying amount and accumulated amortization of capitalized software costs at December31, 2008 were $576million and $192million, respectively. Amortization expense of capitalized software costs is estimated to be $60million annually for 2010 through 2014. Gross property under capital leases was $153million at December31, 2009 and December31, 2008. Accumulated

Jointly Owned Utility Plant

Jointly Owned Utility Plant
	12 Months Ended Dec. 31, 2009 USD / shares
Jointly Owned Utility Plant [Abstract]
Jointly Owned Utility Plant	NOTE8 JOINTLY OWNED UTILITY PLANT Detroit Edison has joint ownership interest in two power plants, Belle River and Ludington Hydroelectric Pumped Storage. Detroit Edisons share of direct expenses of the jointly owned plants are included in Fuel, purchased power and gas and Operation and maintenance expenses in the Consolidated Statements of Operations. Ownership information of the two utility plants as of December31, 2009 was as follows: Ludington Hydroelectric Belle River Pumped Storage In-service date 1984-1985 1973 Total plant capacity 1,260MW 1,872MW Ownership interest * 49 % Investment (in millions) $ 1,626 $ 197 Accumulated depreciation (in millions) $ 889 $ 128 * Detroit Edisons ownership interest is 63% in Unit No.1, 81% of the facilities applicable to Belle River used jointly by the Belle River and St. Clair Power Plants and 75% in common facilities used at Unit No.2. Belle River The Michigan Public Power Agency (MPPA) has an ownership interest in Belle River Unit No.1 and other related facilities. The MPPA is entitled to 19% of the total capacity and energy of the plant and is responsible for the same percentage of the plants operation, maintenance and capital improvement costs. Ludington Hydroelectric Pumped Storage Consumers Energy Company has an ownership interest in the Ludington Hydroelectric Pumped Storage Plant. Consumers Energy is entitled to 51% of the total capacity and energy of the plant and is responsible for the same percentage of the plants operation, maintenance and capital improvement costs.

Asset Retirement Obligations

Asset Retirement Obligations
	12 Months Ended Dec. 31, 2009 USD / shares
Asset Retirement Obligations [Abstract]
Asset Retirement Obligations	NOTE9 ASSET RETIREMENT OBLIGATIONS The Company has a legal retirement obligation for the decommissioning costs for its Fermi 1 and Fermi 2 nuclear plants. To a lesser extent, the Company has legal retirement obligations for gas production facilities, gas gathering facilities and various other operations. The Company has conditional retirement obligations for gas pipeline retirement costs and disposal of asbestos at certain of its power plants. To a lesser extent, the Company has conditional retirement obligations at certain service centers, compressor and gate stations, and disposal costs for PCB contained within transformers and circuit breakers. The Company recognizes such obligations as liabilities at fair market value when they are incurred, which generally is at the time the associated assets are placed in service. Fair value is measured using expected future cash outflows discounted at our credit-adjusted risk-free rate. In its regulated operations, the Company defers timing differences that arise in the expense recognition of legal asset retirement costs that are currently recovered in rates. No liability has been recorded with respect to lead-based paint, as the quantities of lead-based paint in the Companys facilities are unknown. In addition, there is no incremental cost to demolitions of lead-based paint facilities vs. non-lead-based paint facilities and no regulations currently exist requiring any type of special disposal of items containing lead-based paint. The Ludington Hydroelectric Power Plant (a jointly owned plant) has an indeterminate life and no legal obligation currently exists to decommission the plant at some future date. Substations, manholes and certain other distribution assets within Detroit Edison have an indeterminate life. Therefore, no liability has been recorded for these assets. A reconciliation of the asset retirement obligations for 2009 follows: (in Millions) Asset retirement obligations at January1, 2009 $ 1,361 Accretion 87 Liabilities incurred 1 Liabilities settled (15 ) Revision in estimated cash flows 5 Asset retirement obligations at December31, 2009 1,439 Less amount included in current liabilities (19 ) $ 1,420 Detroit Edison has a legal obligation to decommission its nuclear power plants following the expiration of their operating licenses. This obligation is reflected as an asset retirement obligation on the Consolidated Statements of Financial Position. Based on the actual or anticipated extended life of the nuclear plant, decommissioning expenditures for Fermi 2 are expected to be incurred primarily during the period of 2025 through 2050. It is estimated that the cost of decommissioning Fermi 2, when its license expires in 2025, will be $1.3billion in 2009 dollars and $3.4billion in 2025 dollars, using a 6% inflation rate. In 2001, Detroit Edison began the decommissioning of Fermi 1, with the goal of removing the radioactive material and terminating the Fermi 1 license. The decommissioning o

Disposals and Discontinued Oper

Disposals and Discontinued Operations
	12 Months Ended Dec. 31, 2009 USD / shares
Disposals and Discontinued Operations [Abstract]
Disposals and Discontinued Operations	NOTE10 DISPOSALS AND DISCONTINUED OPERATIONS Sale of Gathering and Processing Assets In 2009, the Company sold certain non-strategic gas gathering and processing assets in northern Michigan for gross proceeds of approximately $45million, which approximated its carrying value, including allocated goodwill. Sale of Interest in Barnett Shale Properties In 2008, the Company sold a portion of its Barnett shale properties for gross proceeds of approximately $260million. The Company recognized a gain of $128million ($80million after-tax) on the sale during 2008. Sale of Antrim Shale Gas Exploration and Production Business In 2007, the Company sold its Antrim shale gas exploration and production business (Antrim) for gross proceeds of $1.3billion. The pre-tax gain recognized on this sale amounted to $900million ($580million after-tax) and is reported on the Consolidated Statements of Operations under the line item, Gain on sale of non-utility business, and included in the Corporate Other segment. Prior to the sale, the operating results of Antrim were reflected in the Unconventional Gas Production segment. The Antrim business is not presented as a discontinued operation due to continuation of cash flows related to the sale of a portion of Antrims natural gas production to Energy Trading under the terms of natural gas sales contracts that expire in 2010 and 2012. Prior to the sale, a substantial portion of the Companys price risk related to expected gas production from its Antrim shale business had been hedged through 2013. These financial contracts were accounted for as cash flow hedges, with changes in estimated fair value of the contracts reflected in other comprehensive income. Upon the sale of Antrim, the financial contracts no longer qualified as cash flow hedges. In conjunction with the Antrim sale, the Company reclassified amounts held in accumulated other comprehensive income and recorded the effective settlements, reducing operating revenues in 2007 by $323million. Plan to Sell Interest in Certain Power and Industrial Projects During the third quarter of 2007, the Company announced its plans to sell a 50% interest in a portfolio of select Power and Industrial Projects. As a result, the assets and liabilities of the Projects were classified as held for sale at that time and the Company ceased recording depreciation and amortization expense related to these assets. During 2008, the Companys work on this planned monetization was discontinued. As of June30, 2008, the assets and liabilities of the Projects were no longer classified as held for sale. Depreciation and amortization resumed in June 2008 when the assets were reclassified as held and used. During the second quarter of 2008, the Company recorded a loss of $19million related to the valuation adjustment for the cumulative depreciation and amortization not recorded during the held for sale period. Synthetic Fuel Business The Company discontinued the operations of its synthetic fuel production facilities throughout the United States as of December31, 2007. Synfuel plants chemically changed coal and waste coal into a synthetic fuel

Other Impairments and Restructu

Other Impairments and Restructuring
	12 Months Ended Dec. 31, 2009 USD / shares
Other Impairments and Restructuring [Abstract]
Other Impairments and Restructuring	NOTE11 OTHER IMPAIRMENTS AND RESTRUCTURING Other Impairments Barnett Shale Our Unconventional Gas Production segment recorded pre-tax impairment losses of $6million, $8million and $27million in 2009, 2008 and 2007, respectively. The impairments related primarily to the write-off of leases that expired or will expire within the next twelve months that are not expected to be developed under current economic conditions. Restructuring Costs In 2005, the Company initiated a company-wide review of its operations called the Performance Excellence Process. Specifically, the Company began a series of focused improvement initiatives within Detroit Edison and MichCon, and associated corporate support functions. The Company incurred costs to achieve (CTA) restructuring expense for employee severance and other costs. Other costs include project management and consultant support. In September 2006, the MPSC issued an order approving a settlement agreement that allows Detroit Edison and MichCon, commencing in 2006, to defer the incremental CTA. Further, the order provides for Detroit Edison and MichCon to amortize the CTA deferrals over a ten-year period beginning with the year subsequent to the year the CTA was deferred. Detroit Edison deferred approximately $24million and $54million of CTA in 2008 and 2007 as a regulatory asset. The recovery of these costs was provided for by the MPSC in the order approving the settlement in the show cause proceeding and in the December23, 2008 MPSC rate order. Amortization of prior year deferred CTA costs amounted to $18million in 2009, $16million in 2008 and $10million in 2007. MichCon cannot defer CTA costs at this time because a regulatory recovery mechanism has not been established by the MPSC. MichCon is seeking a recovery mechanism in its rate case filed in June 2009. Amounts expensed are recorded in Operation and maintenance expense on the Consolidated Statements of Operations. Deferred amounts are recorded in Regulatory assets on the Consolidated Statements of Financial Position. Costs incurred in 2008 and 2007 are as follows: Employee Severance Costs Other Costs Total Cost 2008 2007 2008 2007 2008 2007 (in Millions) Costs incurred: Electric Utility $ $ 15 $ 26 $ 50 $ 26 $ 65 Gas Utility 3 7 6 7 9 Other 1 3 1 3 2 Total costs 19 36 57 36 76 Less amounts deferred or capitalized: Electric Utility 15 26 50 26 65 Amount expensed $ $ 4 10 $ 7

Regulatory Matters

Regulatory Matters
	12 Months Ended Dec. 31, 2009 USD / shares
Regulatory Matters [Abstract]
Regulatory Matters	NOTE12 REGULATORY MATTERS Regulation Detroit Edison and MichCon are subject to the regulatory jurisdiction of the MPSC, which issues orders pertaining to rates, recovery of certain costs, including the costs of generating facilities and regulatory assets, conditions of service, accounting and operating-related matters. Detroit Edison is also regulated by the FERC with respect to financing authorization and wholesale electric activities. Regulation results in differences in the application of generally accepted accounting principles between regulated and non-regulated businesses. Regulatory Assets and Liabilities Detroit Edison and MichCon are required to record regulatory assets and liabilities for certain transactions that would have been treated as revenue or expense in non-regulated businesses. Continued applicability of regulatory accounting treatment requires that rates be designed to recover specific costs of providing regulated services and be charged to and collected from customers. Future regulatory changes or changes in the competitive environment could result in the discontinuance of this accounting treatment for regulatory assets and liabilities for some or all of our businesses and may require the write-off of the portion of any regulatory asset or liability that was no longer probable of recovery through regulated rates. Management believes that currently available facts support the continued use of regulatory assets and liabilities and that all regulatory assets and liabilities are recoverable or refundable in the current rate environment. The following are balances and a brief description of the regulatory assets and liabilities at December 31: 2009 2008 (in Millions) Assets Recoverable pension and postretirement costs: Pension $ 1,670 $ 1,505 Postretirement costs 665 787 Recoverable income taxes related to securitized regulatory assets 476 549 Asset retirement obligation 415 452 Deferred income taxes Michigan Business Tax 407 394 Recoverable uncollectible expense 138 122 Cost to achieve Performance Excellence Process 136 154 Other recoverable income taxes 89 89 Unamortized loss on reacquired debt 70 73 Deferred environmental costs 40 43 Enterprise Business Systems costs 24 26 Recoverable costs under PA 141 Excess capital expenditures 4 Deferred Clean Air Act expenditures 10 Midwest Independent System Operator charges 8 Electric Customer Choice implementation costs 18 37 Accrued PSCR/GCR revenue 22 Other 15 8 4,163 4,283 Less amount included in current assets (53 ) (52 ) $ 4,1

Income Taxes

Income Taxes
	12 Months Ended Dec. 31, 2009 USD / shares
Income Taxes [Abstract]
Income Taxes	NOTE13 INCOME TAXES Income Tax Summary The Company files a consolidated federal income tax return. Total income tax expense varied from the statutory federal income tax rate for the following reasons: 2009 2008 2007 (in Millions) Income before income taxes $ 782 $ 819 $ 1,155 Income tax expense at 35% statutory rate $ 274 $ 287 $ 404 Production tax credits (12 ) (7 ) (11 ) Investment tax credits (7 ) (7 ) (8 ) Depreciation (4 ) (4 ) (4 ) Employee Stock Ownership Plan dividends (5 ) (4 ) (5 ) Medicare partD subsidy (6 ) (5 ) (6 ) Domestic production activities deduction (5 ) (2 ) (2 ) Goodwill attributed to the sale of Gas Utility subsidiaries 4 Settlement of Federal tax audit (11 ) State and local income taxes, net of federal benefit 25 23 2 Other, net (6 ) 7 (6 ) Income tax expense from continuing operations $ 247 $ 288 $ 364 Effective income tax rate 31.6 % 35.2 % 31.5 % Components of income tax expense were as follows: 2009 2008 2007 (in Millions) Continuing operations Current income taxes Federal $ 25 $ 130 $ 276 State and other income tax expense 17 17 1 Total current income taxes 42 147 277 Deferred income taxes Federal 182 121 85 State and other income tax expense 23 20 2 Total deferred income taxes 205 141 87 Total income taxes from continuing operations 247 288 364 Discontinued operations 12 66 Total $ 247 $ 300 $ 430 Deferred tax assets and liabilities are recognized for the estimated future tax effect of temporary differences between the tax basis of assets or liabilities and the reported amounts in the financial statements. Deferred tax assets and liabilities are classified as current or noncurrent according to the classification of the related assets or liabilities. Deferred tax assets and liabilities not related to assets or liabilities are classified according to the expected reversal date of the te

Common Stock

Common Stock
	12 Months Ended Dec. 31, 2009 USD / shares
Common Stock [Abstract]
Common Stock	NOTE14 COMMON STOCK Common Stock In May 2007, The DTE Energy Board of Directors authorized the repurchase of up to $850million of common stock through 2009. During 2009, no repurchases of common stock were made under this authorization that expired on December31, 2009. Under the DTE Energy Company Long-Term Incentive Plan, the Company grants non-vested stock awards to key employees, primarily management. As a result of a stock award, a settlement of an award of performance shares, or by exercise of a participants stock option, the Company may deliver common stock from the Companys authorized but unissued common stock and/or from outstanding common stock acquired by or on behalf of the Company in the name of the participant. Dividends Certain of the Companys credit facilities contain a provision requiring the Company to maintain a total funded debt to capitalization ratio, as defined in the agreements, of no more than 0.65 to 1, which has the effect of limiting the amount of dividends the Company can pay in order to maintain compliance with this provision. The effect of this provision as of December31, 2009 was to restrict the payment of approximately $268million of total retained earnings of approximately $3.2billion. There are no other effective limitations with respect to the Companys ability to pay dividends.

Earnings per Share

Earnings per Share
	12 Months Ended Dec. 31, 2009 USD / shares
Earnings per Share [Abstract]
Earnings per Share	NOTE15 EARNINGS PER SHARE The Company reports both basic and diluted earnings per share. The calculation of diluted earnings per share assumes the issuance of potentially dilutive common shares outstanding during the period from the exercise of stock options. Effective January1, 2009, the adoption of new accounting requirements clarifying the definition of participating securities to be included in the earnings per share calculation had the effect of reducing previously reported 2008 amounts for basic and diluted earnings per share by $.03 and $.02, respectively. The corresponding reduction in 2007 for basic and diluted earnings per share was $.03 and $.01, respectively. A reconciliation of both calculations is presented in the following table as of December 31: 2009 2008 2007 (in Millions, except per share amounts) Basic Earnings per Share Net income attributable to DTE Energy Company $ 532 $ 546 $ 971 Average number of common shares outstanding 164 163 170 Weighted average net restricted shares outstanding 1 1 1 Dividends declared common shares $ 347 $ 344 $ 356 Dividends declared net restricted shares $ 2 $ 2 $ 2 Total distributed earnings $ 349 $ 346 $ 358 Net income less distributed earnings $ 183 $ 200 $ 613 Distributed (dividends per common share) $ 2.12 $ 2.12 $ 2.12 Undistributed 1.12 1.22 3.58 Total Basic Earnings per Common Share $ 3.24 $ 3.34 $ 5.70 Diluted Earnings per Share Net income attributable to DTE Energy Company $ 532 $ 546 $ 971 Average number of common shares outstanding 164 163 170 Average incremental shares from assumed exercise of options 1 Common shares for dilutive calculation 164 163 171 Weighted average net restricted shares outstanding 1 1 1 Dividends declared common shares $ 347 $ 344 $ 356 Dividends declared net restricted shares $ 2 $ 2 $ 2 Total distributed earnings $ 349 $ 346 $ 358 Net inc

Long-Term Debt

Long-Term Debt
	12 Months Ended Dec. 31, 2009 USD / shares
Long-Term Debt [Abstract]
Long-Term Debt	NOTE16 LONG-TERM DEBT Long-Term Debt The Companys long-term debt outstanding and weighted average interest rates (1)of debt outstanding at December 31 were: 2009 2008 (in Millions) Mortgage bonds, notes, and other DTE Energy Debt, Unsecured 6.7% due 2010 to 2033 $ 1,597 $ 1,497 Detroit Edison Taxable Debt, Principally Secured 5.9% due 2010 to 2038 2,829 2,841 Detroit Edison Tax-Exempt Revenue Bonds(2) 5.5% due 2011 to 2036 1,263 1,263 MichCon Taxable Debt, Principally Secured 6.1% due 2012 to 2033 889 889 Other Long-Term Debt, Including Non-Recourse Debt 180 188 6,758 6,678 Less amount due within one year (521 ) (220 ) $ 6,237 $ 6,458 Securitization bonds 6.4% due 2010 to 2015 $ 933 $ 1,064 Less amount due within one year (140 ) (132 ) $ 793 $ 932 Trust preferred-linked securities 7.8% due 2032 $ 186 $ 186 7.5% due 2044 103 103 $ 289 $ 289 (1) Weighted average interest rates as of December31, 2009 are shown below the description of each category of debt. (2) Detroit Edison Tax-Exempt Revenue Bonds are issued by a public body that loans the proceeds to Detroit Edison on terms substantially mirroring the Revenue Bonds. Debt Issuances In 2009, the Company issued or remarketed the following long-term debt: Company Month Issued Type Interest Rate Maturity Amount (in Millions) Detroit Edison April Tax-Exempt Revenue Bonds(1) 6.00 % 2036 $ 69 DTE Energy May Senior Notes(2) 7.625 % 2014 300 Detroit Edison June Tax-Exempt Revenue Bonds(3) 5.625 % 2020 32 Detroit Edison June Tax-Exempt Revenue Bonds(4) 5.25 % 2029 60 Detroit Edison June Tax-Exempt Revenue Bonds(5) 5.50 % 2029 59 Detroit Edison November Tax-Exempt Revenue Bonds(6) 3.05 % 2024 65 $ 585 (1) Proceeds were used to refund existing Tax-Exempt Revenue Bonds. (2) Proceeds were used to repay short-term borrowings. (3) These Tax-Exempt Revenue Bonds were converted from a variable rate mode and remarketed in a fixed rate mode to maturity.

Preferred Securities

Preferred Securities
	12 Months Ended Dec. 31, 2009 USD / shares
Preferred Securities [Abstract]
Preferred Securities	NOTE17 PREFERRED AND PREFERENCE SECURITIES As of December31, 2009, the amount of authorized and unissued stock is as follows: Type of Shares Company Stock Par Value Authorized DTE Energy Preferred None 5,000,000 Detroit Edison Preferred $ 100 6,747,484 Detroit Edison Preference $ 1 30,000,000 MichCon Preferred $ 1 7,000,000 MichCon Preference $ 1 4,000,000

Short-Term Credit Arrangements

Short-Term Credit Arrangements and Borrowings
	12 Months Ended Dec. 31, 2009 USD / shares
Short-Term Credit Arrangements and Borrowings [Abstract]
Short-Term Credit Arrangements and Borrowings	NOTE18 SHORT-TERM CREDIT ARRANGEMENTS AND BORROWINGS DTE Energy and its wholly-owned subsidiaries, Detroit Edison and MichCon, have entered into revolving credit facilities with similar terms. The five-year and two-year revolving credit facilities are with a syndicate of 22 banks and may be used for general corporate borrowings, but are intended to provide liquidity support for each of the companies commercial paper programs. No one bank provides more than 8.5% of the commitment in any facility. Borrowings under the facilities are available at prevailing short-term interest rates. Additionally, DTE Energy has other facilities to support letter of credit issuance. The above agreements require the Company to maintain a total funded debt to capitalization ratio, as defined in the agreements, of no more than 0.65 to 1. At December31, 2009, the debt to total capitalization ratios for DTE Energy, Detroit Edison and MichCon are 0.51 to 1, 0.52 to 1 and 0.49 to 1, respectively, and are in compliance with this financial covenant. The availability under these combined facilities at December31, 2009 is shown in the following table: DTE Detroit Energy Edison MichCon Total (in Millions) Five-year unsecured revolving facility, expiring October2010 $ 675 $ 69 $ 181 $ 925 Two-year unsecured revolving facility, expiring April2011 538 212 250 1,000 One-year unsecured letter of credit facility, expiring in June2010 70 70 Two-year unsecured letter of credit facility, expiring in May2011 50 50 Total credit facilities at December31, 2009 1,333 281 431 2,045 Amounts outstanding at December31, 2009: Commercial paper issuances 327 327 Letters of credit 206 206 206 327 533 Net availability at December31, 2009 $ 1,127 $ 281 $ 104 $ 1,512 The Company has other outstanding letters of credit which are not included in the above described facilities totaling approximately $16million which are used for various corporate purposes. The weighted average interest rate for short-term borrowings was 0.7% and 3.9% at December31, 2009 and 2008, respectively. In April 2009, the Company completed an early renewal of $975million of its syndicated revolving credit facilities before their scheduled expiration in October 2009. The new $1billion two-year facility will expire in April 2011 and has similar covenants to the prior facility. A new two-year $50million credit facility was completed in May 2009 and a new one-year $70mil

Capital and Operating Leases

Capital and Operating Leases
	12 Months Ended Dec. 31, 2009 USD / shares
Capital and Operating Leases [Abstract]
Capital and Operating Leases	NOTE19 CAPITAL AND OPERATING LEASES Lessee The Company leases various assets under capital and operating leases, including coal railcars, office buildings, a warehouse, computers, vehicles and other equipment. The lease arrangements expire at various dates through 2031. Future minimum lease payments under non-cancelable leases at December31, 2009 were: Capital Operating Leases Leases (in Millions) 2010 $ 14 $ 33 2011 12 29 2012 9 25 2013 9 21 2014 9 17 Thereafter 23 83 Total minimum lease payments 76 $ 208 Less imputed interest 15 Present value of net minimum lease payments 61 Less current portion 10 Non-current portion $ 51 Rental expense for operating leases was $58million in 2009, $49million in 2008, and $60million in 2007. Lessor MichCon leases a portion of its pipeline system to the Vector Pipeline through a capital lease contract that expires in 2020, with renewal options extending for five years. We own a 40% interest in the Vector Pipeline. The components of the net investment in the capital lease at December31, 2009, were as follows: (in Millions) 2010 $ 9 2011 9 2012 9 2013 9 2014 9 Thereafter 53 Total minimum future lease receipts 98 Residual value of leased pipeline 40 Less unearned income 63 Net investment in capital lease 75 Less current portion 2 $ 73

Commitments and Contingencies

Commitments and Contingencies
	12 Months Ended Dec. 31, 2009 USD / shares
Commitments and Contingencies [Abstract]
Commitments and Contingencies	NOTE20 COMMITMENTS AND CONTINGENCIES Environmental Electric Utility Air Detroit Edison is subject to EPA ozone transport and acid rain regulations that limit power plant emissions of sulfur dioxide and nitrogen oxides. Since 2005, EPA and the State of Michigan have issued additional emission reduction regulations relating to ozone, fine particulate, regional haze and mercury air pollution. The new rules will lead to additional controls on fossil-fueled power plants to reduce nitrogen oxide, sulfur dioxide and mercury emissions. To comply with these requirements, Detroit Edison has spent approximately $1.5billion through 2009. The Company estimates Detroit Edison will make future undiscounted capital expenditures of up to $73million in 2010 and up to $2.2billion of additional capital expenditures through 2019 based on current regulations. Further, additional rulemakings are expected over the next few years which could require additional controls for sulfur dioxide, nitrogen oxides and hazardous air pollutants. It is not possible to quantify the impact of those expected rulemakings at this time. In July 2009, DTE Energy received a Notice of Violation/Finding of Violation (NOV/FOV) from the EPA alleging, among other things, that five Detroit Edison power plants violated New Source Performance standards, Prevention of Significant Deterioration requirements, and TitleV operating permit requirements under the Clean Air Act. We believe that the plants identified by the EPA have complied with applicable regulations. Depending upon the outcome of our discussions with the EPA regarding the NOV/FOV, the EPA could bring legal action against Detroit Edison. We could also be required to install additional pollution control equipment at some or all of the power plants in question, engage in Supplemental Environmental Programs, and/or pay fines. We cannot predict the financial impact or outcome of this matter, or the timing of its resolution. Water In response to an EPA regulation, Detroit Edison is required to examine alternatives for reducing the environmental impacts of the cooling water intake structures at several of its facilities. Based on the results of completed studies and expected future studies, Detroit Edison may be required to install additional control technologies to reduce the impacts of the water intakes. Initially, it was estimated that Detroit Edison could incur up to approximately $55million over the four to six years subsequent to 2008 in additional capital expenditures to comply with these requirements. However, a January 2007 circuit court decision remanded back to the EPA several provisions of the federal regulation that may result in a delay in compliance dates. The decision also raised the possibility that Detroit Edison may have to install cooling towers at some facilities at a cost substantially greater than was initially estimated for other mitigative technologies. In 2008, the Supreme Court agreed to review the remanded cost-benefit analysis provision of the rule and in April 2009 upheld EPAs use of this provision in determining best technology available for reducing environmental impacts. Concurr

Retirement Benefits and Trusted

Retirement Benefits and Trusted Assets
	12 Months Ended Dec. 31, 2009 USD / shares
Retirement Benefits and Trusted Assets [Abstract]
Retirement Benefits and Trusted Assets	NOTE21 RETIREMENT BENEFITS AND TRUSTEED ASSETS Measurement Date In 2008, we changed the measurement date of our pension and postretirement benefit plans from November 30 to December31. As a result, we recognized adjustments of $17million ($9million after-tax) and $4million to retained earnings and regulatory liabilities, respectively, which represents approximately one month of pension and other postretirement benefit costs for the period from December1, 2007 to December31, 2008. All amounts and balances reported in the following tables as of December31, 2009 and December31, 2008 are based on measurement dates of December31, 2009 and December31, 2008, respectively. Pension Plan Benefits The Company has qualified defined benefit retirement plans for eligible represented and non-represented employees. The plans are noncontributory and cover substantially all employees. The plans provide traditional retirement benefits based on the employees years of benefit service, average final compensation and age at retirement. In addition, certain represented and non-represented employees are covered under cash balance provisions that determine benefits on annual employer contributions and interest credits. The Company also maintains supplemental nonqualified, noncontributory, retirement benefit plans for selected management employees. These plans provide for benefits that supplement those provided by DTE Energys other retirement plans. The Companys policy is to fund pension costs by contributing amounts consistent with the Pension Protection Act of 2006 provisions and additional amounts when it deems appropriate. The Company anticipates making up to a $200million contribution to its pension plans in 2010. Net pension cost includes the following components: Pension Plans 2009 2008 2007 (in Millions) Service cost $ 52 $ 55 $ 62 Interest cost 203 190 178 Expected return on plan assets (255 ) (259 ) (237 ) Amortization of: Net actuarial loss 52 32 59 Prior service cost 6 6 6 Special termination benefits 8 Net pension cost $ 58 $ 24 $ 76 Special termination benefits in the above tables represent costs associated with our Performance Excellence Process. Pension Plans 2009 2008 (in Millions) Other changes in plan assets and benefit obligations recognized in other comprehensive income and regulatory assets Net actuarial loss $ 216 $ 1,061 Amortization of net actuarial loss (52 ) (32 ) Prior service cost 13 Amortization of prior service cost (6 ) (6 ) Total recognized in other comprehensive income and regulatory as

Stock-based Compensation

Stock-based Compensation
	12 Months Ended Dec. 31, 2009 USD / shares
Stock-based Compensation [Abstract]
Stock-based Compensation	NOTE22 STOCK-BASED COMPENSATION The Companys stock incentive program permits the grant of incentive stock options, non-qualifying stock options, stock awards, performance shares and performance units to employees and members of its Board of Directors. Key provisions of the stock incentive program are: Authorized limit is 9,000,000shares of common stock; Prohibits the grant of a stock option with an exercise price that is less than the fair market value of the Companys stock on the date of the grant;and Imposes the following award limits to a single participant in a single calendar year, (1)options for more than 500,000shares of common stock; (2)stock awards for more than 150,000shares of common stock; (3)performance share awards for more than 300,000shares of common stock (based on the maximum payout under the award); or (4)more than 1,000,000 performance units, which have a face amount of $1.00 each. The Company records compensation expense at fair value over the vesting period for all awards it grants. In addition, the Company is required to record compensation expense at fair value (as previous awards continue to vest) for the unvested portion of previously granted stock option awards that were outstanding as of January1, 2006. As of December31, 2008, all such awards have been fully expensed. Stock-based compensation for the reporting periods is as follows: 2009 2008 2007 (in Millions) Stock-based compensation $ 56 $ 38 $ 28 Tax benefit of compensation $ 22 $ 13 $ 10 Approximately $3.3million, $1.6million, and $1.4million of compensation cost was capitalized as part of fixed assets during 2009, 2008, and 2007, respectively. Options Options are exercisable according to the terms of the individual stock option award agreements and expire 10years after the date of the grant. The option exercise price equals the fair value of the stock on the date that the option was granted. Stock options vest ratably over a three-year period. Stock option activity was as follows: Weighted Aggregate Number of Average Intrinsic Options Exercise Price Value (in Millions) Options outstanding at January1, 2009 5,013,699 $ 42.45 Granted 812,500 $ 27.75 Exercised (83,845 ) $ 32.08 Forfeited or expired (148,962 ) $ 40.52 Options outstanding at December31, 2009 5,593,392 $ 40.50 $ 10 Options exercisable at December31, 2009 4,128,877 $ 42.60 $ 1 As of December31, 2009, the weighted average remaining contractual life for the exercisable shares is 4.17years. As of December31, 2009, 1,464,515 options were non-vested. During 2009, 588,

Supplemental Cash Flow Informat

Supplemental Cash Flow Information
	12 Months Ended Dec. 31, 2009 USD / shares
Supplemental Cash Flow Information [Abstract]
Supplemental Cash Flow Information	NOTE23 SUPPLEMENTAL CASH FLOW INFORMATION A detailed analysis of the changes in assets and liabilities that are reported in the Consolidated Statements of Cash Flows follows: 2009 2008 2007 (in Millions) Changes in Assets and Liabilities, Exclusive of Changes Shown Separately Accounts receivable, net $ 167 $ 328 $ (163 ) Accrued GCR revenue 27 (71 ) (10 ) Inventories 28 96 80 Recoverable pension and postretirement costs (19 ) (1,324 ) 738 Accrued/prepaid pensions 11 944 (401 ) Accounts payable (162 ) (286 ) 5 Accrued PSCR refund 7 82 41 Income taxes payable 43 (22 ) (19 ) Derivative assets and liabilities (81 ) (178 ) 222 Postretirement obligation (147 ) 340 (320 ) Other assets 36 (51 ) (430 ) Other liabilities 159 50 449 $ 69 $ (92 ) $ 192 Supplementary cash and non-cash information for the years ended December31, were as follows: 2009 2008 2007 (in Millions) Cash paid (received) for: Interest (net of interest capitalized) $ 550 $ 496 $ 537 Income taxes $ 18 $ (59 ) $ 326 Noncash financing activities: Common stock issued for employee benefit plans $ 47 $ 15 $ 6

Segment and Related Information

Segment and Related Information
	12 Months Ended Dec. 31, 2009 USD / shares
Segment and Related Information [Abstract]
Segment and Related Information	NOTE24 SEGMENT AND RELATED INFORMATION The Company sets strategic goals, allocates resources and evaluates performance based on the following structure: Electric Utility segment consists of Detroit Edison, which is engaged in the generation, purchase, distribution and sale of electricity to approximately 2.1million residential, commercial and industrial customers in southeastern Michigan. Gas Utility segment consists of MichCon and Citizens. MichCon is engaged in the purchase, storage, transmission, gathering, distribution and sale of natural gas to approximately 1.2million residential, commercial and industrial customers throughout Michigan. Citizens distributes natural gas in Adrian, Michigan to approximately 17,000 customers. Gas Storage and Pipelines consists of natural gas pipelines and storage businesses. Unconventional Gas Production is engaged in unconventional gas project development and production. Power and Industrial Projects is comprised of coke batteries and pulverized coal projects, reduced emission fuel and steel industry fuel-related projects, on-site energy services, power generation and coal transportation and marketing. Energy Trading consists of energy marketing and trading operations. Corporate Other, includes various holding company activities, holds certain non-utility debt and energy-related investments. The federal income tax provisions or benefits of DTE Energys subsidiaries are determined on an individual company basis and recognize the tax benefit of production tax credits and net operating losses if applicable. The Michigan Business Tax provision of the utility subsidiaries is determined on an individual company basis and recognizes the tax benefit of various tax credits and net operating losses if applicable. The subsidiaries record federal and state income taxes payable to or receivable from DTE Energy based on the federal and state tax provisions of each company. Inter-segment billing for goods and services exchanged between segments is based upon tariffed or market-based prices of the provider and primarily consists of power sales, gas sales and coal transportation services in the following segments: 2009 2008 2007 (in Millions) Electric Utility $ 28 $ 16 $ 36 Gas Utility 2 7 5 Gas Storage and Pipelines 5 10 17 Unconventional Gas Production 64 Power and Industrial Projects 11 80 197 Energy Trading 93 145 7 Corporate Other (74 ) (80 ) (35 ) $ 65 $ 178 $ 291 Financial data of the business segments follows: Net Income Attributable

Supplementary Quarterly Financi

Supplementary Quarterly Financial Information (Unaudited)
	12 Months Ended Dec. 31, 2009 USD / shares
Supplementary Quarterly Financial Information (Unaudited) [Abstract]
Supplementary Quarterly Financial Information (Unaudited)	NOTE25 SUPPLEMENTARY QUARTERLY FINANCIAL INFORMATION (UNAUDITED) Quarterly earnings per share may not total for the years, since quarterly computations are based on weighted average common shares outstanding during each quarter. First Second Third Fourth Quarter Quarter Quarter(1) Quarter Year (in Millions, except per share amounts) 2009 Operating Revenues $ 2,255 $ 1,688 $ 1,950 $ 2,121 $ 8,014 Operating Income $ 395 $ 215 $ 332 $ 307 $ 1,249 Net Income Attributable to DTE Energy Company From Continuing Operations $ 178 $ 83 $ 151 $ 120 $ 532 Net Income Attributable to DTE Energy Company $ 178 $ 83 $ 151 $ 120 $ 532 Basic Earnings per Share Continuing Operations $ 1.09 $ .51 $ .92 $ .72 $ 3.24 Total $ 1.09 $ .51 $ .92 $ .72 $ 3.24 Diluted Earnings per Share Continuing Operations $ 1.09 $ .51 $ .92 $ .72 $ 3.24 Total $ 1.09 $ .51 $ .92 $ .72 $ 3.24 (1) The 2009 Third Quarter results were adjusted for the effect of the January 2010 Detroit Edison MPSC rate order that required the refund of a portion of the self implemented rate increase effective on July26, 2009. The adjustments resulted in a reduction of Operating Revenues of $11million, Operating Income of $11million, Net Income Attributable to DTE Energy From Continuing Operations and Net Income Attributable to DTE Energy Company of $7million, and Basic and Diluted Earnings per Share of $0.04. 2008 Operating Revenues $ 2,570 $ 2,251 $ 2,338 $ 2,170 $ 9,329 Operating Income $ 429 $ 157 $ 375 $ 302 $ 1,263 Net Income Attributable to DTE Energy Company From Continuing Operations $ 200 $ 28 $ 169 $ 129 $ 526 Discontinued Operations 12 8 20 Net Income Attributable to DTE Energy Company $ 212 $

Valuation and Qualifying Accoun

Valuation and Qualifying Accounts
	12 Months Ended Dec. 31, 2009 USD / shares
Valuation and Qualifying Accounts [Abstract]
Valuation and Qualifying Accounts	Schedule Of Valuation And Qualifying Accounts Disclosure DTE Energy Company ScheduleII Valuation and Qualifying Accounts Year Ending December31, 2009 2008 2007 (in Millions) Allowance for Doubtful Accounts (shown as deduction from Accounts Receivable in the Consolidated Statements of Financial Position) Balance at Beginning of Period $ 265 $ 182 $ 170 Additions: Charged to costs and expenses 155 198 133 Charged to other accounts(1) 17 18 12 Deductions(2) (175 ) (133 ) (133 ) Balance at End of Period $ 262 $ 265 $ 182 (1) Collection of accounts previously written off and, in 2008, balances previously held for sale of $4million. (2) Uncollectible accounts written off.