v3.25.2
Fair Value (Reconciliation of Level 3 Assets and Liabilities Measured at Fair Value on a Recurring Basis) (Details) - Recurring - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Net Assets (Liabilities) as of beginning of period $ (89) $ (26) $ 13 $ 75
Transfers into Level 3 from Level 2 2 1 4 0
Transfers from Level 3 into Level 2     2 0
Total gains (losses)        
Included in earnings 164 123 105 95
Recorded in Regulatory liabilities 28 30 26 27
Purchases, issuances, and settlements        
Settlements (91) (90) (136) (159)
Net Assets (Liabilities) as of end of period 14 38 14 38
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 63 69 (27) 32
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 30 28 30 28
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 3 3 9 7
Total gains (losses)        
Recorded in Regulatory liabilities 28 30 26 27
Purchases, issuances, and settlements        
Settlements (1) (5) (5) (6)
Net Assets (Liabilities) as of end of period 30 28 30 28
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 30 28 30 28
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 0 (3) (18) 22
Transfers into Level 3 from Level 2 2 1 4 0
Transfers from Level 3 into Level 2     0 0
Total gains (losses)        
Included in earnings (20) 31 (43) 7
Recorded in Regulatory liabilities 0 0 0 0
Purchases, issuances, and settlements        
Settlements 9 (26) 48 (26)
Net Assets (Liabilities) as of end of period (9) 3 (9) 3
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 (11) 20 (21) (18)
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 (91) (25) 24 47
Transfers into Level 3 from Level 2 0 0 0 0
Transfers from Level 3 into Level 2     0 0
Total gains (losses)        
Included in earnings 182 93 146 90
Recorded in Regulatory liabilities 0 0 0 0
Purchases, issuances, and settlements        
Settlements (99) (59) (178) (128)
Net Assets (Liabilities) as of end of period (8) 9 (8) 9
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 72 80 (7) 81
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 2 2 7 6
Transfers into Level 3 from Level 2 0 0 0 0
Transfers from Level 3 into Level 2     2 0
Total gains (losses)        
Included in earnings 2 (1) 2 (2)
Recorded in Regulatory liabilities 28 30 26 27
Purchases, issuances, and settlements        
Settlements (1) (5) (6) (5)
Net Assets (Liabilities) as of end of period 31 26 31 26
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 2 (31) 1 (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 $ 30 $ 28 $ 30 $ 28