Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Operating Activities
Net Income	$ 397	$ 342
Net Income	397	340
Adjustments to reconcile Net Income to Net cash from operating activities:
Depreciation and amortization	368	353
Nuclear fuel amortization	15	13
Allowance for equity funds used during construction	(7)	(6)
Deferred income taxes	41	213
Equity earnings of equity method investees	(32)	(29)
Dividends from equity method investees	42	39
Asset (gains) losses and impairments, net	1	(6)
Changes in assets and liabilities:
Accounts receivable, net	107	151
Inventories	52	55
Prepaid postretirement benefit costs	(15)	(14)
Accounts payable	(20)	(24)
Gas inventory equalization	68	62
Accrued pension liability	(24)	(13)
Accrued postretirement liability	(3)	0
Derivative assets and liabilities	126	(30)
Regulatory assets and liabilities	128	(149)
Other current and noncurrent assets and liabilities	(187)	104
Net cash from operating activities	1,057	1,061
Investing Activities
Plant and equipment expenditures — utility	(630)	(993)
Plant and equipment expenditures — non-utility	(39)	(195)
Acquisitions related to business combinations, net of cash acquired	0	(128)
Proceeds from sale of assets	1	4
Proceeds from sale of nuclear decommissioning trust fund assets	271	439
Investment in nuclear decommissioning trust funds	(273)	(438)
Distributions from equity method investees	4	1
Contributions to equity method investees	(2)	(15)
Notes receivable	(27)	(14)
Other	(10)	(3)
Net cash used for investing activities	(705)	(1,342)
Financing Activities
Issuance of long-term debt, net of issuance costs	989	1,092
Redemption of long-term debt	0	(300)
Short-term borrowings, net	14	303
Repurchase of common stock	(54)	0
Dividends paid on common stock	(210)	(195)
Contributions from noncontrolling interests, principally REF entities	12	10
Distributions to noncontrolling interests	(14)	(10)
Other	(35)	(36)
Net cash from financing activities	702	864
Net Increase in Cash, Cash Equivalents, and Restricted Cash	1,054	583
Cash, Cash Equivalents, and Restricted Cash at Beginning of Period	516	93
Cash, Cash Equivalents, and Restricted Cash at End of Period	1,570	676
Supplemental disclosure of non-cash investing and financing activities
Plant and equipment expenditures in accounts payable	208	285
DTE Electric
Operating Activities
Net Income	208	94
Adjustments to reconcile Net Income to Net cash from operating activities:
Depreciation and amortization	260	258
Nuclear fuel amortization	15	13
Allowance for equity funds used during construction	(6)	(6)
Deferred income taxes	15	7
Changes in assets and liabilities:
Accounts receivable, net	114	54
Inventories	24	(18)
Accounts payable	(8)	106
Prepaid postretirement benefit costs — affiliates	(8)	0
Accrued pension liability — affiliates	(12)	(6)
Accrued postretirement liability — affiliates	(2)	(8)
Regulatory assets and liabilities	121	(152)
Other current and noncurrent assets and liabilities	(150)	132
Net cash from operating activities	571	474
Investing Activities
Plant and equipment expenditures	(502)	(871)
Proceeds from sale of nuclear decommissioning trust fund assets	271	439
Investment in nuclear decommissioning trust funds	(273)	(438)
Other	(9)	(2)
Net cash used for investing activities	(513)	(872)
Financing Activities
Issuance of long-term debt, net of issuance costs	989	1,092
Redemption of long-term debt	0	(300)
Short-term borrowings, net — affiliate	(23)	42
Short-term borrowings, net — other	0	(283)
Dividends paid on common stock	(147)	(135)
Other	(15)	(17)
Net cash from financing activities	804	399
Net Increase in Cash, Cash Equivalents, and Restricted Cash	862	1
Cash, Cash Equivalents, and Restricted Cash at Beginning of Period	16	12
Cash, Cash Equivalents, and Restricted Cash at End of Period	878	13
Supplemental disclosure of non-cash investing and financing activities
Plant and equipment expenditures in accounts payable	$ 141	$ 138