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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, 2024
Dec. 31, 2023
Purchases, issuances, and settlements:    
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Non-utility operations, Fuel, purchased power, and gas — utility Non-utility operations, Fuel, purchased power, and gas — utility
Fair Value, Net Derivative Asset (Liability), Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Non-utility operations, Fuel, purchased power, and gas — utility Non-utility operations, Fuel, purchased power, and gas — utility
Recurring    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]    
Net Assets (Liabilities) as of January 1 $ 75 $ (277)
Transfers into Level 3 from Level 2 1 0
Transfers from Level 3 into Level 2 74 17
Total gains (losses)    
Included in earnings 240 379
Recorded in Regulatory liabilities 21 9
Purchases, issuances, and settlements:    
Settlements (398) (53)
Net Assets (Liabilities) as of December 31 13 75
Total gains (losses) included in Net Income attributed to the change in unrealized gains (losses) related to assets and liabilities held at December 31 (88) 114
Total gains (losses) included in Regulatory liabilities attributed to the change in unrealized gains (losses) related to assets and liabilities held at December 31 9 7
Recurring | Natural Gas    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]    
Net Assets (Liabilities) as of January 1 22 (255)
Transfers into Level 3 from Level 2 1 0
Transfers from Level 3 into Level 2 0 17
Total gains (losses)    
Included in earnings 16 182
Recorded in Regulatory liabilities 0 0
Purchases, issuances, and settlements:    
Settlements (57) 78
Net Assets (Liabilities) as of December 31 (18) 22
Total gains (losses) included in Net Income attributed to the change in unrealized gains (losses) related to assets and liabilities held at December 31 (47) 85
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
Recurring | Electricity    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]    
Net Assets (Liabilities) as of January 1 47 (33)
Transfers into Level 3 from Level 2 0 0
Transfers from Level 3 into Level 2 74 0
Total gains (losses)    
Included in earnings 225 198
Recorded in Regulatory liabilities 0 0
Purchases, issuances, and settlements:    
Settlements (322) (118)
Net Assets (Liabilities) as of December 31 24 47
Total gains (losses) included in Net Income attributed to the change in unrealized gains (losses) related to assets and liabilities held at December 31 118 151
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
Recurring | Other    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]    
Net Assets (Liabilities) as of January 1 6 11
Transfers into Level 3 from Level 2 0 0
Transfers from Level 3 into Level 2 0 0
Total gains (losses)    
Included in earnings (1) (1)
Recorded in Regulatory liabilities 21 9
Purchases, issuances, and settlements:    
Settlements (19) (13)
Net Assets (Liabilities) as of December 31 7 6
Total gains (losses) included in Net Income attributed to the change in unrealized gains (losses) related to assets and liabilities held at December 31 (159) (122)
Total gains (losses) included in Regulatory liabilities attributed to the change in unrealized gains (losses) related to assets and liabilities held at December 31 9 7
Recurring | DTE Electric    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]    
Net Assets (Liabilities) as of January 1 7 11
Total gains (losses)    
Recorded in Regulatory liabilities 21 9
Purchases, issuances, and settlements:    
Settlements (19) (13)
Net Assets (Liabilities) as of December 31 9 7
Total gains (losses) included in Regulatory liabilities attributed to the change in unrealized gains (losses) related to assets and liabilities held at December 31 $ 9 $ 7