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Fair Value (Reconciliation of Level 3 Assets and Liabilities at Fair Value on a Recurring Basis) (Details) - Recurring - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]    
Net Assets (Liabilities) as of beginning of period $ (215) $ (2)
Transfers from Level 3 into Level 2 5 0
Total gains (losses)    
Included in earnings (218) (41)
Recorded in Regulatory liabilities (4) (1)
Purchases, issuances, and settlements    
Settlements 91 (63)
Net Assets (Liabilities) as of end of period (341) (107)
Total gains (losses) included in Net Income attributed to the change in unrealized gains (losses) related to assets and liabilities held at end of period (190) (100)
DTE Electric    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]    
Net Assets (Liabilities) as of beginning of period 9 4
Total gains (losses)    
Recorded in Regulatory liabilities (4) (1)
Purchases, issuances, and settlements    
Settlements (2) (2)
Net Assets (Liabilities) as of end of period 3 1
Natural gas    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]    
Net Assets (Liabilities) as of beginning of period (179) (16)
Transfers from Level 3 into Level 2 5 0
Total gains (losses)    
Included in earnings (171) (67)
Recorded in Regulatory liabilities 0 0
Purchases, issuances, and settlements    
Settlements 115 (6)
Net Assets (Liabilities) as of end of period (230) (89)
Total gains (losses) included in Net Income attributed to the change in unrealized gains (losses) related to assets and liabilities held at end of period (129) (93)
Electricity    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]    
Net Assets (Liabilities) as of beginning of period (45) 10
Transfers from Level 3 into Level 2 0 0
Total gains (losses)    
Included in earnings (50) 26
Recorded in Regulatory liabilities 0 0
Purchases, issuances, and settlements    
Settlements (22) (55)
Net Assets (Liabilities) as of end of period (117) (19)
Total gains (losses) included in Net Income attributed to the change in unrealized gains (losses) related to assets and liabilities held at end of period (64) (7)
Other    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]    
Net Assets (Liabilities) as of beginning of period 9 4
Transfers from Level 3 into Level 2 0 0
Total gains (losses)    
Included in earnings 3 0
Recorded in Regulatory liabilities (4) (1)
Purchases, issuances, and settlements    
Settlements (2) (2)
Net Assets (Liabilities) as of end of period 6 1
Total gains (losses) included in Net Income attributed to the change in unrealized gains (losses) related to assets and liabilities held at end of period $ 3 $ 0