Regulatory Matters Regulatory Matters (Schedule of Regulatory Liabilities) (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Regulatory Liabilities [Line Items]
Regulatory liabilities	$ 2,893	$ 589
Less amount included in Current Liabilities	(18)	(34)
Regulatory liabilities, noncurrent	2,875	555
Refundable federal income taxes
Regulatory Liabilities [Line Items]
Regulatory liabilities	2,384	0
Removal costs liability
Regulatory Liabilities [Line Items]
Regulatory liabilities	265	266
Renewable energy
Regulatory Liabilities [Line Items]
Regulatory liabilities	112	145
Negative other postretirement offset
Regulatory Liabilities [Line Items]
Regulatory liabilities	80	56
Negative pension offset
Regulatory Liabilities [Line Items]
Regulatory liabilities	21	36
Fermi 2 refueling outage
Regulatory Liabilities [Line Items]
Regulatory liabilities	15	27
Refundable self-implemented rates
Regulatory Liabilities [Line Items]
Regulatory liabilities	2	27
Other
Regulatory Liabilities [Line Items]
Regulatory liabilities	14	32
DTE Electric
Regulatory Liabilities [Line Items]
Regulatory liabilities	2,154	256
Less amount included in Current Liabilities	(17)	(27)
Regulatory liabilities, noncurrent	2,137	229
DTE Electric | Refundable federal income taxes
Regulatory Liabilities [Line Items]
Regulatory liabilities	1,946	0
DTE Electric | Removal costs liability
Regulatory Liabilities [Line Items]
Regulatory liabilities	0	0
DTE Electric | Renewable energy
Regulatory Liabilities [Line Items]
Regulatory liabilities	112	145
DTE Electric | Negative other postretirement offset
Regulatory Liabilities [Line Items]
Regulatory liabilities	67	55
DTE Electric | Negative pension offset
Regulatory Liabilities [Line Items]
Regulatory liabilities	0	0
DTE Electric | Fermi 2 refueling outage
Regulatory Liabilities [Line Items]
Regulatory liabilities	15	27
DTE Electric | Refundable self-implemented rates
Regulatory Liabilities [Line Items]
Regulatory liabilities	2	27
DTE Electric | Other
Regulatory Liabilities [Line Items]
Regulatory liabilities	$ 12	$ 2