Consolidated Statements of Financial Position (Unaudited) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Current Assets
Cash and cash equivalents	$ 218	$ 65
Restricted cash, principally Securitization	65	122
Accounts receivable (less allowance for doubtful accounts of $59 and $62, respectively)
Customer	1,460	1,336
Other	89	126
Inventories
Fuel and gas	301	527
Materials and supplies	239	234
Deferred income taxes	8	21
Derivative assets	56	108
Regulatory assets	175	182
Other	158	194
Total Current Assets	2,769	2,915
Investments
Nuclear decommissioning trust funds	1,083	1,037
Other	568	554
Total Investments	1,651	1,591
Property
Property, plant and equipment	23,936	23,631
Less accumulated depreciation, depletion and amortization	(9,070)	(8,947)
Property, plant and equipment, net	14,866	14,684
Other Assets
Goodwill	2,018	2,018
Regulatory assets	3,819	4,235
Securitized regulatory assets	369	413
Intangible assets	135	135
Notes receivable	109	112
Derivative assets	17	39
Other	196	197
Total Noncurrent Assets	6,663	7,149
Total Assets	25,949	26,339
Current Liabilities
Accounts payable	711	848
Accrued interest	123	93
Dividends payable	108	107
Short-term borrowings	0	240
Current portion long-term debt, including capital leases	840	817
Derivative liabilities	81	125
Gas inventory equalization	140	0
Other	473	538
Total Current Liabilities	2,476	2,768
Long-Term Debt (net of current portion)
Mortgage bonds, notes and other	6,528	6,220
Securitization bonds	201	302
Junior subordinated debentures	480	480
Capital lease obligations	9	12
Total Long-Term Debt (net of current portion)	7,218	7,014
Other Liabilities
Deferred income taxes	3,245	3,191
Regulatory liabilities	997	1,031
Asset retirement obligations	1,745	1,719
Unamortized investment tax credit	53	56
Derivative liabilities	14	26
Accrued pension liability	1,402	1,498
Accrued postretirement liability	721	1,160
Nuclear decommissioning	165	159
Other	281	306
Total Noncurrent Liabilities	8,623	9,146
Equity
Common stock, without par value, 400,000,000 shares authorized, 173,950,853 and 172,351,680 shares issued and outstanding, respectively	3,683	3,587
Retained earnings	4,069	3,944
Accumulated other comprehensive loss	(156)	(158)
Total DTE Energy Company Equity	7,596	7,373
Noncontrolling interests	36	38
Total Equity	7,632	7,411
Total Liabilities and Equity	$ 25,949	$ 26,339