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Fair Value (Reconciliation of Level 3 Assets and Liabilities at Fair Value on a Recurring Basis) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]    
Net Assets (Liabilities) as of January 1 $ 13 $ 75
Transfers into Level 3 from Level 2 2 1
Transfers from Level 3 into Level 2 2 74
Total gains (losses)    
Included in earnings 308 240
Recorded in Regulatory liabilities 19 21
Purchases, issuances, and settlements:    
Settlements (325) (398)
Net Assets (Liabilities) as of December 31 19 13
Total gains (losses) included in Net Income attributed to the change in unrealized gains (losses) related to assets and liabilities held at December 31 4 (88)
Total gains (losses) included in Regulatory liabilities attributed to the change in unrealized gains (losses) related to assets and liabilities held at December 31 $ 11 $ 9
Fair Value, Net Derivative Asset (Liability), Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Non-utility operations Non-utility operations
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Non-utility operations Non-utility operations
Natural Gas    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]    
Net Assets (Liabilities) as of January 1 $ (18) $ 22
Transfers into Level 3 from Level 2 2 1
Transfers from Level 3 into Level 2 0 0
Total gains (losses)    
Included in earnings (25) 16
Recorded in Regulatory liabilities 0 0
Purchases, issuances, and settlements:    
Settlements 68 (57)
Net Assets (Liabilities) as of December 31 27 (18)
Total gains (losses) included in Net Income attributed to the change in unrealized gains (losses) related to assets and liabilities held at December 31 23 (47)
Total gains (losses) included in Regulatory liabilities attributed to the change in unrealized gains (losses) related to assets and liabilities held at December 31 0 0
Electricity    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]    
Net Assets (Liabilities) as of January 1 24 47
Transfers into Level 3 from Level 2 0 0
Transfers from Level 3 into Level 2 0 74
Total gains (losses)    
Included in earnings 329 225
Recorded in Regulatory liabilities 0 0
Purchases, issuances, and settlements:    
Settlements (372) (322)
Net Assets (Liabilities) as of December 31 (19) 24
Total gains (losses) included in Net Income attributed to the change in unrealized gains (losses) related to assets and liabilities held at December 31 (19) 118
Total gains (losses) included in Regulatory liabilities attributed to the change in unrealized gains (losses) related to assets and liabilities held at December 31 0 0
Other    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]    
Net Assets (Liabilities) as of January 1 7 6
Transfers into Level 3 from Level 2 0 0
Transfers from Level 3 into Level 2 2 0
Total gains (losses)    
Included in earnings 4 (1)
Recorded in Regulatory liabilities 19 21
Purchases, issuances, and settlements:    
Settlements (21) (19)
Net Assets (Liabilities) as of December 31 11 7
Total gains (losses) included in Net Income attributed to the change in unrealized gains (losses) related to assets and liabilities held at December 31 0 (159)
Total gains (losses) included in Regulatory liabilities attributed to the change in unrealized gains (losses) related to assets and liabilities held at December 31 11 9
DTE Electric    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]    
Net Assets (Liabilities) as of January 1 9 7
Total gains (losses)    
Recorded in Regulatory liabilities 19 21
Purchases, issuances, and settlements:    
Settlements (17) (19)
Net Assets (Liabilities) as of December 31 11 9
Total gains (losses) included in Regulatory liabilities attributed to the change in unrealized gains (losses) related to assets and liabilities held at December 31 $ 11 $ 9