Consolidated Statements of Cash Flows - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Operating Activities
Net Income		$ 1,172	$ 1,118	$ 1,112
Net Income		1,169	1,120	1,134
Adjustments to reconcile Net Income to Net cash from operating activities:
Depreciation and amortization		1,263	1,124	1,030
Nuclear fuel amortization		60	45	53
Allowance for equity funds used during construction		(24)	(28)	(23)
Deferred income taxes		329	114	196
Equity earnings of equity method investees		(111)	(132)	(102)
Dividends from equity method investees		160	74	74
Asset (gains) losses and impairments, net		14	29	38
Changes in assets and liabilities:
Accounts receivable, net		49	(44)	(252)
Inventories		59	(32)	(4)
Prepaid postretirement benefit costs		(24)	(45)	0
Accounts payable		(288)	146	129
Accrued pension liability		(29)	(87)	(228)
Accrued postretirement liability		0	(61)	25
Derivative assets and liabilities		(28)	31	(94)
Regulatory assets and liabilities		160	15	217
Other current and noncurrent assets and liabilities		(113)	413	(54)
Net cash from operating activities		2,649	2,680	2,117
Investing Activities
Plant and equipment expenditures — utility		(2,724)	(2,439)	(2,037)
Plant and equipment expenditures — non-utility		(273)	(274)	(213)
Acquisition, net of cash acquired		(2,470)	0	0
Proceeds from sale of nuclear decommissioning trust fund assets		788	1,203	1,240
Investment in nuclear decommissioning trust funds		(794)	(1,188)	(1,226)
Distributions from equity method investees		10	9	10
Contributions to equity method investees		(149)	(637)	(299)
Notes receivable		(98)
Notes receivable			2	1
Other		(22)	(23)	(38)
Net cash used for investing activities		(5,732)	(3,347)	(2,562)
Financing Activities
Issuance of long-term debt, net of issuance costs		2,506	1,432	1,398
Redemption of long-term debt		(821)	(105)	(385)
Issuance of equity units, net of issuance costs		1,265	0	0
Short-term borrowings, net		219		122
Short-term borrowings, net			(12)
Issuance of common stock		1,023	0	0
Repurchase of common stock		0	0	(51)
Dividends on common stock		(692)	(620)	(592)
Contributions from noncontrolling interests, principally REF entities		38	53	50
Distributions to noncontrolling interests		(59)	(48)	(40)
Purchases of noncontrolling interest, principally SGG		(300)	0	0
Other		(79)	(46)	(81)
Net cash from (used for) financing activities		3,100	654	421
Net Increase (Decrease) in Cash, Cash Equivalents, and Restricted Cash		17	(13)	(24)
Cash, Cash Equivalents, and Restricted Cash at Beginning of Period		76	89	113
Cash, Cash Equivalents, and Restricted Cash at End of Period		93	76	89
Supplemental disclosure of cash information
Cash paid (received) for: Interest, net of interest capitalized		595	572	495
Cash paid (received) for: Income taxes		18	(26)	4
Supplemental disclosure of non-cash investing and financing activities
Plant and equipment expenditures in accounts payable	[1]	311	307	295
Premium on equity units	[1]	150	0	0
DTE Electric
Operating Activities
Net Income		716	664	601
Adjustments to reconcile Net Income to Net cash from operating activities:
Depreciation and amortization		946	836	753
Nuclear fuel amortization		60	45	53
Allowance for equity funds used during construction		(22)	(19)	(18)
Deferred income taxes		97	189	345
Asset (gains) losses and impairments, net		13	0	0
Changes in assets and liabilities:
Accounts receivable, net		20	33	(80)
Inventories		(17)	15	31
Prepaid postretirement benefit costs — affiliates		(77)	(76)	1
Accounts payable		(57)	54	(2)
Accrued pension liability — affiliates		(1)	(93)	(197)
Accrued postretirement liability — affiliates		89	(33)	42
Regulatory assets and liabilities		139	4	202
Other current and noncurrent assets and liabilities		(197)	101	(147)
Net cash from operating activities		1,709	1,720	1,584
Investing Activities
Plant and equipment expenditures		(2,200)	(1,989)	(1,574)
Proceeds from sale of nuclear decommissioning trust fund assets		788	1,203	1,240
Investment in nuclear decommissioning trust funds		(794)	(1,188)	(1,226)
Other		(21)	(15)	18
Net cash used for investing activities		(2,227)	(1,989)	(1,542)
Financing Activities
Issuance of long-term debt, net of issuance costs		643	519	435
Redemption of long-term debt		0	0	(300)
Capital contribution by parent company		180	325	100
Short-term borrowings, net — affiliate		(4)	(15)	(1)
Short-term borrowings, net — other		205	(89)	176
Dividends on common stock		(494)	(461)	(432)
Other		(18)	(7)	(18)
Net cash from (used for) financing activities		512	272	(40)
Net Increase (Decrease) in Cash, Cash Equivalents, and Restricted Cash		(6)	3	2
Cash, Cash Equivalents, and Restricted Cash at Beginning of Period		18	15	13
Cash, Cash Equivalents, and Restricted Cash at End of Period		12	18	15
Supplemental disclosure of cash information
Cash paid (received) for: Interest, net of interest capitalized		295	283	252
Cash paid (received) for: Income taxes		46	0	(16)
Supplemental disclosure of non-cash investing and financing activities
Plant and equipment expenditures in accounts payable		$ 192	$ 181	$ 191

[1] See Note 15 to the Consolidated Financial Statements, "Long-Term Debt" for additional non-cash financing activity related to the remarketing of RSNs.