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Consolidated Statements of Cash Flows (Unaudited) - DTE Energy Company - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Operating Activities    
Net Income $ 1,093 $ 1,112
Adjustments to reconcile Net Income to Net cash from operating activities:    
Depreciation and amortization 1,367 1,288
Nuclear fuel amortization 50 38
Allowance for equity funds used during construction (72) (62)
Deferred income taxes 70 16
Equity (earnings) of equity method investees (16) (36)
Dividends from equity method investees 2 2
Asset (gains) losses and impairments, net 48 (1)
Changes in assets and liabilities:    
Accounts receivable, net 252 174
Inventories (304) (337)
Prepaid postretirement benefit costs (59) (51)
Accounts payable (97) (89)
Accrued pension liability (27) (64)
Accrued postretirement liability (1) 0
Derivative assets and liabilities 17 43
Regulatory assets and liabilities 144 505
Other current and noncurrent assets and liabilities (106) 21
Net cash from operating activities 2,361 2,559
Investing Activities    
Plant and equipment expenditures — utility (2,999) (3,170)
Plant and equipment expenditures — non-utility (67) (50)
Acquisition related to business combination, net of cash acquired (211) 0
Proceeds from sale of assets 5 46
Proceeds from sale of nuclear decommissioning trust fund assets 592 438
Investment in nuclear decommissioning trust funds (596) (440)
Distributions from equity method investees 8 20
Contributions to equity method investees 0 (4)
Notes receivable (351) (443)
Investment in time deposits 0 (1,050)
Other (64) (60)
Net cash used for investing activities (3,683) (4,713)
Financing Activities    
Issuance of long-term debt, net of discount and issuance costs 4,024 4,215
Redemption of long-term debt (1,200) (143)
Short-term borrowings, net (851) (317)
Dividends paid on common stock (653) (607)
Other (7) (22)
Net cash from financing activities 1,313 3,126
Net Increase (Decrease) in Cash, Cash Equivalents, and Restricted Cash (9) 972
Cash, Cash Equivalents, and Restricted Cash at Beginning of Period 88 51
Cash, Cash Equivalents, and Restricted Cash at End of Period 79 1,023
Supplemental disclosure of non-cash investing and financing activities    
Plant and equipment expenditures in accounts payable $ 441 $ 503