Consolidated Statements of Cash Flows (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Operating Activities
Net Income	$ 911us-gaap_ProfitLoss	$ 668us-gaap_ProfitLoss	$ 618us-gaap_ProfitLoss
Adjustments to reconcile net income to net cash from operating activities:
Depreciation, depletion and amortization	1,145	1,094	1,018
Nuclear fuel amortization	48dte_Nuclearfuelamortization	38dte_Nuclearfuelamortization	29dte_Nuclearfuelamortization
Allowance for equity funds used during construction	(21)	(15)	(13)
Deferred income taxes	356	164	47
Loss on sale of non-utility business	0us-gaap_GainLossOnSaleOfBusiness	0us-gaap_GainLossOnSaleOfBusiness	83us-gaap_GainLossOnSaleOfBusiness
Asset (gains) losses and impairments, net	(4)	(8)	1
Changes in assets and liabilities:
Accounts receivable, net	48	(154)	52
Inventories	(177)us-gaap_IncreaseDecreaseInInventories	123us-gaap_IncreaseDecreaseInInventories	35us-gaap_IncreaseDecreaseInInventories
Accounts payable	128	14	40
Accrued pension obligation	627	(644)	280
Accrued postretirement obligation	165	(526)	(323)
Derivative assets and liabilities	(199)	107	53
Regulatory assets and liabilities	(1,177)	1,269	278
Other assets	(30)	(24)	55
Other liabilities	19	48	(44)
Net cash from operating activities	1,839	2,154	2,209
Investing Activities
Plant and equipment expenditures — utility	(1,784)	(1,534)	(1,451)
Plant and equipment expenditures — non-utility	(265)	(342)	(369)
Proceeds from sale of non-utility business	0	0	255
Proceeds from sale of assets	45	36	38
Acquisition, net of cash acquired	0	0	(198)
Proceeds from sale of nuclear decommissioning trust fund assets	1,146	1,118	759
Investment in nuclear decommissioning trust funds	(1,156)	(1,134)	(764)
Other	(46)	(50)	(39)
Net cash used for investing activities	(2,060)	(1,906)	(1,769)
Financing Activities
Issuance of long-term debt, net of issuance costs	1,736	1,234	759
Redemption of long-term debt	(1,237)us-gaap_RepaymentsOfLongTermDebt	(961)us-gaap_RepaymentsOfLongTermDebt	(639)us-gaap_RepaymentsOfLongTermDebt
Short-term borrowings, net	267	(109)	(179)
Issuance of common stock	0	39	39
Repurchase of common stock	(52)	0	0
Dividends on common stock	(470)us-gaap_PaymentsOfDividendsCommonStock	(445)us-gaap_PaymentsOfDividendsCommonStock	(407)us-gaap_PaymentsOfDividendsCommonStock
Other	(27)	(19)	(16)
Net cash from (used for) financing activities	217	(261)	(443)
Net Decrease in Cash and Cash Equivalents	(4)	(13)	(3)
Cash and Cash Equivalents at Beginning of Period	52	65	68
Cash and Cash Equivalents at End of Period	48	52	65
Supplemental disclosure of cash information
Cash paid (received) for: Interest (net of interest capitalized)	415us-gaap_InterestPaidNet	418us-gaap_InterestPaidNet	438us-gaap_InterestPaidNet
Cash paid (received) for: Income taxes	(35)us-gaap_IncomeTaxesPaidNet	121us-gaap_IncomeTaxesPaidNet	173us-gaap_IncomeTaxesPaidNet
Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract]
Plant and equipment expenditures in accounts payable	$ 212	$ 329	$ 235

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