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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
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]    
Net Assets (Liabilities) as of January 1 $ 4 $ (44)
Transfers from Level 3 into Level 2 (2) 0
Total gains (losses)    
Included in earnings 31 91
Recorded in Regulatory liabilities 20 2
Purchases, issuances, and settlements:    
Settlements (55) (45)
Net Assets (Liabilities) as of December 31 (2) 4
Total gains (losses) included in Net Income attributed to the change in unrealized gains (losses) related to assets and liabilities held at December 31 (4) 20
Total gains (losses) included in Regulatory liabilities attributed to the change in unrealized gains (losses) related to assets and liabilities held at December 31 4 3
Natural Gas    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]    
Net Assets (Liabilities) as of January 1 (15) (49)
Transfers from Level 3 into Level 2 (2) 0
Total gains (losses)    
Included in earnings (75) 15
Recorded in Regulatory liabilities 0 0
Purchases, issuances, and settlements:    
Settlements 76 19
Net Assets (Liabilities) as of December 31 (16) (15)
Total gains (losses) included in Net Income attributed to the change in unrealized gains (losses) related to assets and liabilities held at December 31 (4) (1)
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
Electricity    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]    
Net Assets (Liabilities) as of January 1 16 (2)
Transfers from Level 3 into Level 2 0 0
Total gains (losses)    
Included in earnings 113 77
Recorded in Regulatory liabilities 0 0
Purchases, issuances, and settlements:    
Settlements (119) (59)
Net Assets (Liabilities) as of December 31 10 16
Total gains (losses) included in Net Income attributed to the change in unrealized gains (losses) related to assets and liabilities held at December 31 70 59
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
Other    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]    
Net Assets (Liabilities) as of January 1 3 7
Transfers from Level 3 into Level 2 0 0
Total gains (losses)    
Included in earnings (7) (1)
Recorded in Regulatory liabilities 20 2
Purchases, issuances, and settlements:    
Settlements (12) (5)
Net Assets (Liabilities) as of December 31 4 3
Total gains (losses) included in Net Income attributed to the change in unrealized gains (losses) related to assets and liabilities held at December 31 (70) (38)
Total gains (losses) included in Regulatory liabilities attributed to the change in unrealized gains (losses) related to assets and liabilities held at December 31 4 3
DTE Electric    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]    
Net Assets (Liabilities) as of January 1 3 6
Total gains (losses)    
Recorded in Regulatory liabilities 20 2
Purchases, issuances, and settlements:    
Settlements (19) (5)
Net Assets (Liabilities) as of December 31 4 3
Total gains (losses) included in Regulatory liabilities attributed to the change in unrealized gains (losses) related to assets and liabilities held at December 31 $ 4 $ 3