Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Operating Activities
Net Income	$ 598	$ 1,096
Net Income	601	1,093
Adjustments to reconcile Net Income to Net cash from operating activities:
Depreciation and amortization	1,092	1,059
Nuclear fuel amortization	44	22
Allowance for equity funds used during construction	(20)	(19)
Deferred income taxes	(36)	350
Equity earnings of equity method investees	(90)	(96)
Dividends from equity method investees	78	122
Loss on extinguishment of debt	384	0
Asset (gains) losses and impairments, net	46	44
Changes in assets and liabilities:
Accounts receivable, net	(8)	343
Inventories	(209)	(54)
Prepaid postretirement benefit costs	(59)	(56)
Accounts payable	225	(80)
Accrued pension liability	(65)	(126)
Accrued postretirement liability	(9)	0
Derivative assets and liabilities	309	15
Regulatory assets and liabilities	270	(30)
Other current and noncurrent assets and liabilities	(178)	191
Net cash from operating activities	2,372	2,781
Investing Activities
Plant and equipment expenditures — utility	(2,591)	(2,362)
Plant and equipment expenditures — non-utility	(109)	(526)
Acquisitions related to business combinations, net of cash acquired	0	(126)
Proceeds from sale of assets	2	7
Proceeds from sale of nuclear decommissioning trust fund assets	854	2,054
Investment in nuclear decommissioning trust funds	(853)	(2,051)
Distributions from equity method investees	11	6
Contributions to equity method investees	(7)	(32)
Notes receivable	(65)	(58)
Other	(22)	(5)
Net cash used for investing activities	(2,780)	(3,093)
Financing Activities
Issuance of long-term debt, net of discount and issuance costs	4,033	2,724
Redemption of long-term debt	(3,242)	(682)
Short-term borrowings, net	323	160
Repurchase of common stock	(66)	0
Dividends paid on common stock	(631)	(574)
Contributions from noncontrolling interests, principally REF entities	35	25
Distributions to noncontrolling interests	(33)	(27)
Acquisition related deferred payment, excluding accretion	0	(380)
Prepayment costs for extinguishment of long-term debt	(361)	0
Transfer of cash to DT Midstream at separation	(37)	0
Other	(73)	(65)
Net cash from (used for) financing activities	(52)	1,181
Net Increase (Decrease) in Cash, Cash Equivalents, and Restricted Cash	(460)	869
Cash, Cash Equivalents, and Restricted Cash at Beginning of Period	516	93
Cash, Cash Equivalents, and Restricted Cash at End of Period	56	962
Supplemental disclosure of non-cash investing and financing activities
Plant and equipment expenditures in accounts payable	386	282
Separation of DT Midstream net assets, excluding cash transferred	3,962	0
DTE Electric
Operating Activities
Net Income	790	677
Adjustments to reconcile Net Income to Net cash from operating activities:
Depreciation and amortization	810	768
Nuclear fuel amortization	44	22
Allowance for equity funds used during construction	(18)	(18)
Deferred income taxes	90	74
Asset (gains) losses and impairments, net	0	41
Changes in assets and liabilities:
Accounts receivable, net	(25)	(71)
Inventories	(19)	(30)
Accounts payable	40	37
Prepaid postretirement benefit costs — affiliates	(36)	0
Accrued pension liability — affiliates	(34)	(80)
Accrued postretirement liability — affiliates	(6)	(35)
Regulatory assets and liabilities	229	(79)
Other current and noncurrent assets and liabilities	(259)	(20)
Net cash from operating activities	1,606	1,286
Investing Activities
Plant and equipment expenditures	(2,152)	(1,981)
Proceeds from sale of nuclear decommissioning trust fund assets	854	2,054
Investment in nuclear decommissioning trust funds	(853)	(2,051)
Notes Receivable and Other	(22)	(14)
Net cash used for investing activities	(2,173)	(1,992)
Financing Activities
Issuance of long-term debt, net of discount and issuance costs	986	1,683
Redemption of long-term debt	(321)	(632)
Capital contribution by parent company	273	400
Short-term borrowings, net — affiliate	(69)	7
Short-term borrowings, net — other	159	(154)
Dividends paid on common stock	(441)	(404)
Other	(18)	(17)
Net cash from (used for) financing activities	569	883
Net Increase (Decrease) in Cash, Cash Equivalents, and Restricted Cash	2	177
Cash, Cash Equivalents, and Restricted Cash at Beginning of Period	16	12
Cash, Cash Equivalents, and Restricted Cash at End of Period	18	189
Supplemental disclosure of non-cash investing and financing activities
Plant and equipment expenditures in accounts payable	$ 307	$ 141