Consolidated Statements of Cash Flows - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Operating Activities
Net Income	$ 834	$ 720	$ 911
Net Income	868	727	905
Adjustments to reconcile Net Income to net cash from operating activities:
Depreciation and amortization	976	852	1,145
Nuclear fuel amortization	58	46	48
Allowance for equity funds used during construction	(21)	(21)	(21)
Deferred income taxes	265	237	356
Equity earnings of equity method investees	(68)	(66)	(48)
Dividends from equity method investees	68	64	55
Asset (gains) losses and impairments, net	8	107	(4)
Changes in assets and liabilities:
Accounts receivable, net	(226)	259	48
Inventories	37	1	(177)
Accounts payable	145	(158)	128
Accrued pension liability	19	(147)	627
Accrued postretirement liability	(192)	(287)	165
Derivative assets and liabilities	126	47	(199)
Regulatory assets and liabilities	(40)	85	(1,177)
Other current and noncurrent assets and liabilities	95	177	(12)
Net cash from operating activities	2,084	1,916	1,845
Investing Activities
Plant and equipment expenditures — utility	(1,898)	(1,817)	(1,784)
Plant and equipment expenditures — non-utility	(147)	(203)	(265)
Acquisition, net of cash acquired	(1,147)	(241)	0
Proceeds from sale of assets	6	16	45
Restricted cash for debt redemption, principally Securitization, net	1	97	3
Proceeds from sale of nuclear decommissioning trust fund assets	1,457	885	1,146
Investment in nuclear decommissioning trust funds	(1,463)	(898)	(1,156)
Distributions from equity method investees	11	19	13
Contributions to equity method investees	(239)	(98)	(42)
Other	31	36	(20)
Net cash used for investing activities	(3,388)	(2,204)	(2,060)
Financing Activities
Issuance of long-term debt, net of issuance costs	2,035	956	1,736
Redemption of long-term debt	(807)	(286)	(1,237)
Repurchase of long-term debt	(59)	0	0
Issuance of equity units, net of issuance costs	654	0	0
Short-term borrowings, net	0	101	267
Repurchase of common stock	(33)	0	(52)
Dividends on common stock	(531)	(501)	(470)
Contributions from noncontrolling interests	114	23	0
Other	(14)	(16)	(33)
Net cash from (used for) financing activities	1,359	277	211
Net Increase (Decrease) in Cash and Cash Equivalents	55	(11)	(4)
Cash and Cash Equivalents at Beginning of Period	37	48	52
Cash and Cash Equivalents at End of Period	92	37	48
Supplemental disclosure of cash information
Cash paid (received) for: Interest, net of interest capitalized	448	428	415
Cash paid (received) for: Income taxes	(1)	14	(35)
Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract]
Plant and equipment expenditures in accounts payable	312	207	212
Premium on equity units	98	0	0
DTE Electric
Operating Activities
Net Income	622	544	532
Adjustments to reconcile Net Income to net cash from operating activities:
Depreciation and amortization	750	633	927
Nuclear fuel amortization	58	46	48
Allowance for equity funds used during construction	(18)	(20)	(21)
Deferred income taxes	342	320	297
Equity earnings of equity method investees	(2)	(2)	(1)
Asset (gains) losses and impairments, net	0	0	(1)
Changes in assets and liabilities:
Accounts receivable, net	(64)	33	33
Inventories	26	(22)	(97)
Prepaid postretirement benefit costs — affiliates	(90)	(24)	0
Accounts payable	59	(46)	11
Accrued pension liability — affiliates	32	(224)	495
Accrued postretirement liability — affiliates	(38)	(213)	151
Regulatory assets and liabilities	10	65	(926)
Other current and noncurrent assets and liabilities	(34)	58	(65)
Net cash from operating activities	1,655	1,150	1,384
Investing Activities
Plant and equipment expenditures	(1,503)	(1,545)	(1,561)
Acquisitions	0	(310)	0
Proceeds from sale of assets	6	0	0
Restricted cash for debt redemption, principally Securitization, net	0	96	4
Notes receivable — affiliates	0	8	192
Proceeds from sale of nuclear decommissioning trust fund assets	1,457	885	1,146
Investment in nuclear decommissioning trust funds	(1,463)	(898)	(1,156)
Transfer of Rabbi Trust assets to affiliate	0	137	0
Other	30	6	(14)
Net cash used for investing activities	(1,473)	(1,621)	(1,389)
Financing Activities
Issuance of long-term debt, net of issuance costs	355	495	942
Redemption of long-term debt	(10)	(135)	(837)
Repurchase of long-term debt	(59)	0	0
Capital contribution by parent company	120	300	190
Short-term borrowings, net — affiliate	41	(8)	26
Short-term borrowings, net — other	(210)	222	50
Dividends on common stock	(420)	(395)	(370)
Other	(1)	(7)	(9)
Net cash from (used for) financing activities	(184)	472	(8)
Net Increase (Decrease) in Cash and Cash Equivalents	(2)	1	(13)
Cash and Cash Equivalents at Beginning of Period	15	14	27
Cash and Cash Equivalents at End of Period	13	15	14
Supplemental disclosure of cash information
Cash paid (received) for: Interest, net of interest capitalized	252	244	240
Cash paid (received) for: Income taxes	6	(53)	4
Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract]
Plant and equipment expenditures in accounts payable	$ 232	$ 150	$ 162