Consolidated Statements of Cash Flows - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Operating Activities
Net Income	$ 1,118	$ 1,112	$ 834
Net Income	1,120	1,134	868
Adjustments to reconcile Net Income to Net cash from operating activities:
Depreciation and amortization	1,124	1,030	976
Nuclear fuel amortization	45	53	58
Allowance for equity funds used during construction	(28)	(23)	(21)
Deferred income taxes	114	196	265
Equity earnings of equity method investees	(132)	(102)	(68)
Dividends from equity method investees	74	74	68
Asset (gains) losses and impairments, net	29	38	8
Changes in assets and liabilities:
Accounts receivable, net	(44)	(252)	(226)
Inventories	(32)	(4)	37
Prepaid postretirement benefit costs	(45)	0	0
Accounts payable	146	129	145
Accrued pension liability	(87)	(228)	19
Accrued postretirement liability	(61)	25	(192)
Derivative assets and liabilities	31	(94)	126
Regulatory assets and liabilities	15	217	(40)
Other current and noncurrent assets and liabilities	413	(54)	95
Net cash from operating activities	2,680	2,117	2,084
Investing Activities
Plant and equipment expenditures — utility	(2,439)	(2,037)	(1,898)
Plant and equipment expenditures — non-utility	(274)	(213)	(147)
Acquisition, net of cash acquired	0	0	(1,147)
Proceeds from sale of nuclear decommissioning trust fund assets	1,203	1,240	1,457
Investment in nuclear decommissioning trust funds	(1,188)	(1,226)	(1,463)
Distributions from equity method investees	9	10	11
Contributions to equity method investees	(637)	(299)	(239)
Other	(21)	(37)	36
Net cash used for investing activities	(3,347)	(2,562)	(3,390)
Financing Activities
Issuance of long-term debt, net of issuance costs	1,432	1,398	2,035
Redemption of long-term debt	(105)	(385)	(807)
Repurchase of long-term debt	0	0	(59)
Issuance of equity units, net of issuance costs	0	0	654
Short-term borrowings, net	(12)
Short-term borrowings, net		122	0
Repurchase of common stock	0	(51)	(33)
Dividends on common stock	(620)	(592)	(531)
Contributions from noncontrolling interests, principally REF entities	53	50	114
Distributions to noncontrolling interests	(48)	(40)	(5)
Other	(46)	(81)	(9)
Net cash from (used for) financing activities	654	421	1,359
Net Increase (Decrease) in Cash, Cash Equivalents, and Restricted Cash	(13)	(24)	53
Cash, Cash Equivalents, and Restricted Cash at Beginning of Period	89	113	60
Cash, Cash Equivalents, and Restricted Cash at End of Period	76	89	113
Cash and Cash Equivalents at Beginning of Period	66
Cash and Cash Equivalents at End of Period	71	66
Supplemental disclosure of cash information
Cash paid (received) for: Interest, net of interest capitalized	572	495	448
Cash paid (received) for: Income taxes	(26)	4	(1)
Supplemental disclosure of non-cash investing and financing activities
Plant and equipment expenditures in accounts payable	307	295	312
Premium on equity units	0	0	98
DTE Electric
Operating Activities
Net Income	664	601	622
Adjustments to reconcile Net Income to Net cash from operating activities:
Depreciation and amortization	836	753	750
Nuclear fuel amortization	45	53	58
Allowance for equity funds used during construction	(19)	(18)	(18)
Deferred income taxes	189	345	342
Changes in assets and liabilities:
Accounts receivable, net	33	(80)	(64)
Inventories	15	31	26
Prepaid postretirement benefit costs — affiliates	(76)	1	(90)
Accounts payable	54	(2)	59
Accrued pension liability — affiliates	(93)	(197)	32
Accrued postretirement liability — affiliates	(33)	42	(38)
Regulatory assets and liabilities	4	202	10
Other current and noncurrent assets and liabilities	101	(147)	(34)
Net cash from operating activities	1,720	1,584	1,655
Investing Activities
Plant and equipment expenditures	(1,989)	(1,574)	(1,503)
Proceeds from sale of nuclear decommissioning trust fund assets	1,203	1,240	1,457
Investment in nuclear decommissioning trust funds	(1,188)	(1,226)	(1,463)
Other	(15)	18	36
Net cash used for investing activities	(1,989)	(1,542)	(1,473)
Financing Activities
Issuance of long-term debt, net of issuance costs	519	435	355
Redemption of long-term debt	0	(300)	(10)
Repurchase of long-term debt	0	0	(59)
Capital contribution by parent company	325	100	120
Short-term borrowings, net — affiliate	(15)	(1)	41
Short-term borrowings, net — other	(89)	176	(210)
Dividends on common stock	(461)	(432)	(420)
Other	(7)	(18)	(1)
Net cash from (used for) financing activities	272	(40)	(184)
Net Increase (Decrease) in Cash and Cash Equivalents	3	2	(2)
Cash and Cash Equivalents at Beginning of Period	15	13	15
Cash and Cash Equivalents at End of Period	18	15	13
Supplemental disclosure of cash information
Cash paid (received) for: Interest, net of interest capitalized	283	252	252
Cash paid (received) for: Income taxes	0	(16)	6
Supplemental disclosure of non-cash investing and financing activities
Plant and equipment expenditures in accounts payable	$ 181	$ 191	$ 232