Consolidated Statements of Cash Flows - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Operating Activities
Net Income		$ 1,371	$ 1,172	$ 1,118
Net Income		1,368	1,169	1,120
Adjustments to reconcile Net Income to Net cash from operating activities:
Depreciation and amortization		1,443	1,263	1,124
Nuclear fuel amortization		37	60	45
Allowance for equity funds used during construction		(25)	(24)	(28)
Deferred income taxes		407	329	114
Equity earnings of equity method investees		(132)	(111)	(132)
Dividends from equity method investees		142	160	74
Asset (gains) losses and impairments, net		47	14	29
Changes in assets and liabilities:
Accounts receivable, net		111	49	(44)
Inventories		45	59	(32)
Prepaid postretirement benefit costs		(107)	(24)	(45)
Accounts payable		0	(288)	146
Accrued pension liability		(11)	(29)	(87)
Accrued postretirement liability		22	0	(61)
Derivative assets and liabilities		(23)	(28)	31
Regulatory assets and liabilities		104	160	15
Other current and noncurrent assets and liabilities		266	(113)	413
Net cash from operating activities		3,697	2,649	2,680
Investing Activities
Plant and equipment expenditures — utility		(3,241)	(2,724)	(2,439)
Plant and equipment expenditures — non-utility		(616)	(273)	(274)
Acquisitions related to business combinations, net of cash acquired		(126)	(2,470)	0
Proceeds from sale of assets		13	0	0
Proceeds from sale of nuclear decommissioning trust fund assets		2,350	788	1,203
Investment in nuclear decommissioning trust funds		(2,350)	(794)	(1,188)
Distributions from equity method investees		24	10	9
Contributions to equity method investees		(37)	(149)	(637)
Notes receivable		(85)	(98)
Notes receivable				2
Other		(2)	(22)	(23)
Net cash used for investing activities		(4,070)	(5,732)	(3,347)
Financing Activities
Issuance of long-term debt, net of issuance costs		3,692	2,506	1,432
Redemption of long-term debt		(882)	(821)	(105)
Issuance of equity units, net of issuance costs		0	1,265	0
Short-term borrowings, net		(790)		(12)
Short-term borrowings, net			219
Issuance of common stock		2	1,023	0
Dividends paid on common stock		(760)	(692)	(620)
Contributions from noncontrolling interests, principally REF entities		36	38	53
Distributions to noncontrolling interests		(39)	(59)	(48)
Purchases of noncontrolling interest, principally SGG		0	(300)	0
Acquisition related deferred payment, excluding accretion		(380)	0	0
Other		(83)	(79)	(46)
Net cash from financing activities		796	3,100	654
Net Increase (Decrease) in Cash, Cash Equivalents, and Restricted Cash		423	17	(13)
Cash, Cash Equivalents, and Restricted Cash at Beginning of Period		93	76	89
Cash, Cash Equivalents, and Restricted Cash at End of Period		516	93	76
Supplemental disclosure of cash information
Cash paid (received) for: Interest, net of interest capitalized		679	595	572
Cash paid (received) for: Income taxes	[1]	(360)	18	(26)
Supplemental disclosure of non-cash investing and financing activities
Plant and equipment expenditures in accounts payable		266	311	307
Premium on equity units		0	150	0
DTE Electric
Operating Activities
Net Income		778	716	664
Adjustments to reconcile Net Income to Net cash from operating activities:
Depreciation and amortization		1,043	946	836
Nuclear fuel amortization		37	60	45
Allowance for equity funds used during construction		(23)	(22)	(19)
Deferred income taxes		89	97	189
Asset (gains) losses and impairments, net		41	13	0
Changes in assets and liabilities:
Accounts receivable, net		(42)	20	33
Inventories		(12)	(17)	15
Prepaid postretirement benefit costs — affiliates		(69)	(77)	(76)
Accounts payable		20	(57)	54
Accrued pension liability — affiliates		14	(1)	(93)
Accrued postretirement liability — affiliates		17	89	(33)
Regulatory assets and liabilities		55	139	4
Other current and noncurrent assets and liabilities		(43)	(197)	101
Net cash from operating activities		1,905	1,709	1,720
Investing Activities
Plant and equipment expenditures		(2,674)	(2,200)	(1,989)
Proceeds from sale of nuclear decommissioning trust fund assets		2,350	788	1,203
Investment in nuclear decommissioning trust funds		(2,350)	(794)	(1,188)
Notes receivable and other		(8)	(21)	(15)
Net cash used for investing activities		(2,682)	(2,227)	(1,989)
Financing Activities
Issuance of long-term debt, net of issuance costs		1,683	643	519
Redemption of long-term debt		(632)	0	0
Capital contribution by parent company		636	180	325
Short-term borrowings, net — affiliate		4	(4)	(15)
Short-term borrowings, net — other		(354)	205	(89)
Dividends paid on common stock		(539)	(494)	(461)
Other		(17)	(18)	(7)
Net cash from financing activities		781	512	272
Net Increase (Decrease) in Cash, Cash Equivalents, and Restricted Cash		4	(6)	3
Cash, Cash Equivalents, and Restricted Cash at Beginning of Period		12	18	15
Cash, Cash Equivalents, and Restricted Cash at End of Period		16	12	18
Supplemental disclosure of cash information
Cash paid (received) for: Interest, net of interest capitalized		315	295	283
Cash paid (received) for: Income taxes		14	46	0
Supplemental disclosure of non-cash investing and financing activities
Plant and equipment expenditures in accounts payable		$ 174	$ 192	$ 181

[1] 2020 cash received primarily relates to AMT credit and other refunds, of which a portion was accelerated due to and CARES Act. See Note 11 to the Consolidated Financial Statements, "Income Taxes," for additional information.