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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 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Net Assets (Liabilities) as of beginning of period $ (42) $ (428) $ (277) $ (215)
Transfers into Level 3 from Level 2 0 (3)    
Transfers from Level 3 into Level 2 0 (5) 0 5
Total gains (losses)        
Included in earnings 79 7 273 (359)
Recorded in Regulatory liabilities (2) (4) 3 20
Purchases, issuances, and settlements        
Settlements (48) 59 (12) 175
Net Assets (Liabilities) as of end of period (13) (374) (13) (374)
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 24 61 152 (281)
Total gains (losses) included in Regulatory liabilities attributed to the change in unrealized gains (losses) related to assets and liabilities held at end of period 1 (1) 10 16
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 14 25 11 9
Total gains (losses)        
Recorded in Regulatory liabilities (2) (4) 3 20
Purchases, issuances, and settlements        
Settlements (2) (5) (4) (13)
Net Assets (Liabilities) as of end of period 10 16 10 16
Total gains (losses) included in Regulatory liabilities attributed to the change in unrealized gains (losses) related to assets and liabilities held at end of period 1 (1) 10 16
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 (54) (362) (255) (179)
Transfers into Level 3 from Level 2 0 (3)    
Transfers from Level 3 into Level 2 0 0 0 5
Total gains (losses)        
Included in earnings 1 (32) 163 (382)
Recorded in Regulatory liabilities 0 0 0 0
Purchases, issuances, and settlements        
Settlements 25 84 64 243
Net Assets (Liabilities) as of end of period (28) (313) (28) (313)
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 4 29 94 (248)
Total gains (losses) included in Regulatory liabilities attributed to the change in unrealized gains (losses) related to assets and liabilities held at end of period 0 0 0 0
Electricity        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Net Assets (Liabilities) as of beginning of period (4) (96) (33) (45)
Transfers into Level 3 from Level 2 0 0    
Transfers from Level 3 into Level 2 0 0 0 0
Total gains (losses)        
Included in earnings 79 40 109 22
Recorded in Regulatory liabilities 0 0 0 0
Purchases, issuances, and settlements        
Settlements (71) (20) (72) (53)
Net Assets (Liabilities) as of end of period 4 (76) 4 (76)
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 26 37 94 (2)
Total gains (losses) included in Regulatory liabilities attributed to the change in unrealized gains (losses) related to assets and liabilities held at end of period 0 0 0 0
Other        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Net Assets (Liabilities) as of beginning of period 16 30 11 9
Transfers into Level 3 from Level 2 0 0    
Transfers from Level 3 into Level 2 0 (5) 0
Total gains (losses)        
Included in earnings (1) (1) 1 1
Recorded in Regulatory liabilities (2) (4) 3 20
Purchases, issuances, and settlements        
Settlements (2) (5) (4) (15)
Net Assets (Liabilities) as of end of period 11 15 11 15
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 (6) (5) (36) (31)
Total gains (losses) included in Regulatory liabilities attributed to the change in unrealized gains (losses) related to assets and liabilities held at end of period $ 1 $ (1) $ 10 $ 16