Short-Term Credit Arrangements and Borrowings (Details Textuals) (USD $) In Millions, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Short-term Debt [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 2,025
Revolving Credit Facilities with a Syndicate Number of Banks	19
Number of Banks that Provide Percentage of Commitment in any Facility	1
Maximum Percentage of Commitment to Bank in any Facility	8.70%
Maximum Total Funded Debt to Total Capitalization Ratio	0.65
Other outstanding letters of credit	570
DTE Energy [Member]
Short-term Debt [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	1,425
Total Funded Debt to Total Capitalization Ratio, Amount	0.48
Other outstanding letters of credit	570
Electric [Member]
Short-term Debt [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	300
Total Funded Debt to Total Capitalization Ratio, Amount	0.5
Other outstanding letters of credit	0
Gas [Member]
Short-term Debt [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	300
Total Funded Debt to Total Capitalization Ratio, Amount	0.46
Other outstanding letters of credit	0
Letter of Credit [Member]
Short-term Debt [Line Items]
Other outstanding letters of credit	195
Letter of Credit [Member] | DTE Energy [Member]
Short-term Debt [Line Items]
Other outstanding letters of credit	195
Letter of Credit [Member] | Electric [Member]
Short-term Debt [Line Items]
Other outstanding letters of credit	0
Letter of Credit [Member] | Gas [Member]
Short-term Debt [Line Items]
Other outstanding letters of credit	0
Demand Financing Agreement with Newedge plus letter of credit [Member] | DTE Energy [Member]
Short-term Debt [Line Items]
Financing Agreement, Maximum Borrowing Capacity	150
Demand Financing Agreement with Newedge [Member] | DTE Energy [Member]
Short-term Debt [Line Items]
Financing Agreement, Maximum Borrowing Capacity	100
Maximum Additional Margin Financing	50
Financing Agreement, Amount Outstanding	117	138
Unsecured letter of credit, expiring in May 2014 [Member] | Letter of Credit [Member] | DTE Energy [Member]
Short-term Debt [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	50
Unsecured letter of credit, expiring in February 2015 [Member] | Letter of Credit [Member]
Short-term Debt [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	100
Unsecured letter of credit, expiring in February 2015 [Member] | Letter of Credit [Member] | DTE Energy [Member]
Short-term Debt [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	100
Unsecured letter of credit, expiring in February 2015 [Member] | Letter of Credit [Member] | Electric [Member]
Short-term Debt [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	0
Unsecured letter of credit, expiring in February 2015 [Member] | Letter of Credit [Member] | Gas [Member]
Short-term Debt [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	0
Other outstanding letters of credit [Member] | Letter of Credit [Member] | DTE Energy [Member]
Short-term Debt [Line Items]
Other outstanding letters of credit	66
Demand Financing Agreement with Newedge letter of credit to raise capacity [Member] | Letter of Credit [Member] | DTE Energy [Member]
Short-term Debt [Line Items]
Financing Agreement, Maximum Borrowing Capacity	$ 50