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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, 2023
Dec. 31, 2022
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 $ (277) $ (215)
Transfers from Level 3 into Level 2 17 6
Total gains (losses)    
Included in earnings 379 (311)
Recorded in Regulatory liabilities 9 21
Purchases, issuances, and settlements:    
Settlements (53) 222
Net Assets (Liabilities) as of December 31 75 (277)
Total gains (losses) included in Net Income attributed to the change in unrealized gains (losses) related to assets and liabilities held at December 31 114 (276)
Total gains (losses) included in Regulatory liabilities attributed to the change in unrealized gains (losses) related to assets and liabilities held at December 31 7 11
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 (255) (179)
Transfers from Level 3 into Level 2 17 5
Total gains (losses)    
Included in earnings 182 (410)
Recorded in Regulatory liabilities 0 0
Purchases, issuances, and settlements:    
Settlements 78 329
Net Assets (Liabilities) as of December 31 22 (255)
Total gains (losses) included in Net Income attributed to the change in unrealized gains (losses) related to assets and liabilities held at December 31 85 (215)
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 (33) (45)
Transfers from Level 3 into Level 2 0 1
Total gains (losses)    
Included in earnings 198 97
Recorded in Regulatory liabilities 0 0
Purchases, issuances, and settlements:    
Settlements (118) (86)
Net Assets (Liabilities) as of December 31 47 (33)
Total gains (losses) included in Net Income attributed to the change in unrealized gains (losses) related to assets and liabilities held at December 31 151 50
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 11 9
Transfers from Level 3 into Level 2 0 0
Total gains (losses)    
Included in earnings (1) 2
Recorded in Regulatory liabilities 9 21
Purchases, issuances, and settlements:    
Settlements (13) (21)
Net Assets (Liabilities) as of December 31 6 11
Total gains (losses) included in Net Income attributed to the change in unrealized gains (losses) related to assets and liabilities held at December 31 (122) (111)
Total gains (losses) included in Regulatory liabilities attributed to the change in unrealized gains (losses) related to assets and liabilities held at December 31 7 11
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 11 9
Total gains (losses)    
Recorded in Regulatory liabilities 9 21
Purchases, issuances, and settlements:    
Settlements (13) (19)
Net Assets (Liabilities) as of December 31 7 11
Total gains (losses) included in Regulatory liabilities attributed to the change in unrealized gains (losses) related to assets and liabilities held at December 31 $ 7 $ 11