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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, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Net Assets (Liabilities) as of beginning of period $ (215) $ 46 $ (2) $ 4
Transfers from Level 3 into Level 2 0 (1) 0 (5)
Total gains (losses)        
Included in earnings (183) (42) (361) 39
Recorded in Regulatory liabilities (1) 9 14 21
Purchases, issuances, and settlements        
Settlements 36 (39) (14) (86)
Net Assets (Liabilities) as of end of period (363) (27) (363) (27)
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 (141) (47) (372) 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     12 7
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 15 10 4 3
Total gains (losses)        
Recorded in Regulatory liabilities (1) 9 14 21
Purchases, issuances, and settlements        
Settlements (2) (12) (6) (17)
Net Assets (Liabilities) as of end of period 12 7 12 7
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 12 7
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 (181) 20 (16) (15)
Transfers from Level 3 into Level 2 0 (1) 0 (5)
Total gains (losses)        
Included in earnings (162) (80) (356) (44)
Recorded in Regulatory liabilities 0 0 0 0
Purchases, issuances, and settlements        
Settlements 63 22 92 25
Net Assets (Liabilities) as of end of period (280) (39) (280) (39)
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 (109) (57) (301) (20)
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
Electricity        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Net Assets (Liabilities) as of beginning of period (49) 16 10 16
Transfers from Level 3 into Level 2 0 0 0 0
Total gains (losses)        
Included in earnings (21) 37 (5) 90
Recorded in Regulatory liabilities 0 0 0 0
Purchases, issuances, and settlements        
Settlements (25) (48) (100) (101)
Net Assets (Liabilities) as of end of period (95) 5 (95) 5
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 (30) 11 (54) 53
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
Other        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Net Assets (Liabilities) as of beginning of period 15 10 4 3
Transfers from Level 3 into Level 2 0 0 0 0
Total gains (losses)        
Included in earnings 0 1 0 (7)
Recorded in Regulatory liabilities (1) 9 14 21
Purchases, issuances, and settlements        
Settlements (2) (13) (6) (10)
Net Assets (Liabilities) as of end of period 12 7 12 7
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) $ (1) (17) (17)
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     $ 12 $ 7