Regulatory Matters Regulatory Matters (Schedule of Regulatory Liabilities) (Details) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
Regulatory Liabilities [Line Items]
Regulatory liabilities	$ 610	$ 820
Less amount included in Current Liabilities	(41)	(153)
Regulatory liabilities	569	667
Removal costs liability
Regulatory Liabilities [Line Items]
Regulatory liabilities	291	308
Renewable energy
Regulatory Liabilities [Line Items]
Regulatory liabilities	197	227
Pension
Regulatory Liabilities [Line Items]
Regulatory liabilities	46	67
Accrued PSCR/GCR refund
Regulatory Liabilities [Line Items]
Regulatory liabilities	37	0
Refundable income taxes
Regulatory Liabilities [Line Items]
Regulatory liabilities	23	33
Energy optimization
Regulatory Liabilities [Line Items]
Regulatory liabilities	10	24
Fermi 2 refueling outage
Regulatory Liabilities [Line Items]
Regulatory liabilities	4	16
Securitization over recovery
Regulatory Liabilities [Line Items]
Regulatory liabilities	0	71
Refundable revenue decoupling/deferred gain
Regulatory Liabilities [Line Items]
Regulatory liabilities	0	63
Other
Regulatory Liabilities [Line Items]
Regulatory liabilities	2	11
DTE Electric
Regulatory Liabilities [Line Items]
Regulatory liabilities	218	395
Less amount included in Current Liabilities	(19)	(150)
Regulatory liabilities	199	245
DTE Electric | Removal costs liability
Regulatory Liabilities [Line Items]
Regulatory liabilities	0	0
DTE Electric | Renewable energy
Regulatory Liabilities [Line Items]
Regulatory liabilities	197	227
DTE Electric | Pension
Regulatory Liabilities [Line Items]
Regulatory liabilities	0	0
DTE Electric | Accrued PSCR/GCR refund
Regulatory Liabilities [Line Items]
Regulatory liabilities	15	0
DTE Electric | Refundable income taxes
Regulatory Liabilities [Line Items]
Regulatory liabilities	0	0
DTE Electric | Energy optimization
Regulatory Liabilities [Line Items]
Regulatory liabilities	0	14
DTE Electric | Fermi 2 refueling outage
Regulatory Liabilities [Line Items]
Regulatory liabilities	4	16
DTE Electric | Securitization over recovery
Regulatory Liabilities [Line Items]
Regulatory liabilities	0	71
DTE Electric | Refundable revenue decoupling/deferred gain
Regulatory Liabilities [Line Items]
Regulatory liabilities	0	63
DTE Electric | Other
Regulatory Liabilities [Line Items]
Regulatory liabilities	$ 2	$ 4