Consolidated Statements of Cash Flows - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Operating Activities
Net Income	$ 727	$ 905	$ 661
Net Income	720	911	668
Adjustments to reconcile Net Income to net cash from operating activities:
Depreciation and amortization	852	1,145	1,094
Nuclear fuel amortization	46	48	38
Allowance for equity funds used during construction	(21)	(21)	(15)
Deferred income taxes	237	356	164
Equity earnings of equity method investees	(66)	(48)	(59)
Dividends from equity method investees	64	55	61
Asset (gains) losses and impairments, net	107	(4)	(8)
Changes in assets and liabilities:
Accounts receivable, net	259	48	(154)
Inventories	1	(177)	123
Accounts payable	(158)	128	14
Accrued pension liability	(147)	627	(644)
Accrued postretirement liability	(287)	165	(526)
Derivative assets and liabilities	47	(199)	107
Regulatory assets and liabilities	85	(1,177)	1,269
Other current and noncurrent assets and liabilities	172	(18)	22
Net cash from operating activities	1,911	1,839	2,154
Investing Activities
Plant and equipment expenditures — utility	(1,817)	(1,784)	(1,534)
Plant and equipment expenditures — non-utility	(203)	(265)	(342)
Acquisition	(241)	0	0
Proceeds from sale of assets	16	45	36
Restricted cash for debt redemption, principally Securitization, net	97	3	(1)
Proceeds from sale of nuclear decommissioning trust fund assets	885	1,146	1,118
Investment in nuclear decommissioning trust funds	(898)	(1,156)	(1,134)
Distributions from equity method investees	19	13	8
Contributions to equity method investees	(98)	(42)	(21)
Other	36	(20)	(36)
Net cash used for investing activities	(2,204)	(2,060)	(1,906)
Financing Activities
Issuance of long-term debt, net of issuance costs	956	1,736	1,234
Redemption of long-term debt	(286)	(1,237)	(961)
Short-term borrowings, net	101	267	(109)
Issuance of common stock	9	0	39
Repurchase of common stock	0	(52)	0
Dividends on common stock	(501)	(470)	(445)
Other	3	(27)	(19)
Net cash from (used for) financing activities	282	217	(261)
Net Decrease in Cash and Cash Equivalents	(11)	(4)	(13)
Cash and Cash Equivalents at Beginning of Period	48	52	65
Cash and Cash Equivalents at End of Period	37	48	52
Supplemental disclosure of cash information
Cash paid (received) for: Interest (net of interest capitalized)	428	415	418
Cash paid (received) for: Income taxes	14	(35)	121
Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract]
Plant and equipment expenditures in accounts payable	207	212	329
DTE Electric
Operating Activities
Net Income	544	532	487
Adjustments to reconcile Net Income to net cash from operating activities:
Depreciation and amortization	633	927	896
Nuclear fuel amortization	46	48	38
Allowance for equity funds used during construction	(20)	(21)	(14)
Deferred income taxes	320	297	108
Asset (gains) losses and impairments, net	0	(1)	(3)
Changes in assets and liabilities:
Accounts receivable, net	33	33	(30)
Inventories	(22)	(97)	36
Prepaid postretirement benefit costs — affiliates	(24)	0	0
Accounts payable	(46)	11	(23)
Regulatory assets and liabilities	65	(926)	1,029
Accrued pension liability — affiliates	(224)	495	(663)
Accrued postretirement liability — affiliates	(213)	151	(417)
Other current and noncurrent assets and liabilities	58	(65)	44
Net cash from operating activities	1,150	1,384	1,488
Investing Activities
Restricted cash for debt redemption, principally Securitization, net	96	4	2
Proceeds from sale of nuclear decommissioning trust fund assets	885	1,146	1,118
Investment in nuclear decommissioning trust funds	(898)	(1,156)	(1,134)
Other	6	(14)	(33)
Plant and equipment expenditures	(1,545)	(1,561)	(1,325)
Acquisitions	(310)	0	0
Notes receivable — affiliate	8	192	(200)
Transfer of Rabbi Trust assets to affiliate	137	0	0
Net cash used for investing activities	(1,621)	(1,389)	(1,572)
Financing Activities
Issuance of long-term debt, net of issuance costs	495	942	768
Redemption of long-term debt	(135)	(837)	(590)
Dividends on common stock	(395)	(370)	(342)
Other	(7)	(9)	(3)
Capital contribution by parent company	300	190	400
Short-term borrowings, net — other	222	50	(130)
Short-term borrowings, net — affiliate	(8)	26	(22)
Net cash from (used for) financing activities	472	(8)	81
Net Decrease in Cash and Cash Equivalents	1	(13)	(3)
Cash and Cash Equivalents at Beginning of Period	14	27	30
Cash and Cash Equivalents at End of Period	15	14	27
Supplemental disclosure of cash information
Cash paid (received) for: Interest (net of interest capitalized)	244	240	256
Cash paid (received) for: Income taxes	(53)	4	183
Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract]
Plant and equipment expenditures in accounts payable	$ 150	$ 162	$ 231