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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, 2022
Dec. 31, 2021
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]    
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
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
Recurring    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]    
Net Assets (Liabilities) as of January 1 $ (215) $ (2)
Transfers from Level 3 into Level 2 6 0
Total gains (losses)    
Included in earnings (311) (289)
Recorded in Regulatory liabilities 21 19
Purchases, issuances, and settlements:    
Settlements 222 57
Net Assets (Liabilities) as of December 31 (277) (215)
Total gains (losses) included in Net Income attributed to the change in unrealized gains (losses) related to assets and liabilities held at December 31 (276) (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 11 9
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 (179) (16)
Transfers from Level 3 into Level 2 5 0
Total gains (losses)    
Included in earnings (410) (343)
Recorded in Regulatory liabilities 0 0
Purchases, issuances, and settlements:    
Settlements 329 180
Net Assets (Liabilities) as of December 31 (255) (179)
Total gains (losses) included in Net Income attributed to the change in unrealized gains (losses) related to assets and liabilities held at December 31 (215) (208)
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 (45) 10
Transfers from Level 3 into Level 2 1 0
Total gains (losses)    
Included in earnings 97 54
Recorded in Regulatory liabilities 0 0
Purchases, issuances, and settlements:    
Settlements (86) (109)
Net Assets (Liabilities) as of December 31 (33) (45)
Total gains (losses) included in Net Income attributed to the change in unrealized gains (losses) related to assets and liabilities held at December 31 50 4
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 9 4
Transfers from Level 3 into Level 2 0 0
Total gains (losses)    
Included in earnings 2 0
Recorded in Regulatory liabilities 21 19
Purchases, issuances, and settlements:    
Settlements (21) (14)
Net Assets (Liabilities) as of December 31 11 9
Total gains (losses) included in Net Income attributed to the change in unrealized gains (losses) related to assets and liabilities held at December 31 (111) (72)
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
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 9 4
Total gains (losses)    
Recorded in Regulatory liabilities 21 19
Purchases, issuances, and settlements:    
Settlements (19) (14)
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