Short-Term Credit Arrangements and Borrowings (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2014
Availability under combined facilities
Line of Credit Facility, Maximum Borrowing Capacity	$ 2,025
Amounts Outstanding	570
Net availability	1,455
DTE Energy [Member]
Availability under combined facilities
Line of Credit Facility, Maximum Borrowing Capacity	1,425
Amounts Outstanding	570
Net availability	855
Electric [Member]
Availability under combined facilities
Line of Credit Facility, Maximum Borrowing Capacity	300
Amounts Outstanding	0
Net availability	300
Gas [Member]
Availability under combined facilities
Line of Credit Facility, Maximum Borrowing Capacity	300
Amounts Outstanding	0
Net availability	300
Letter of Credit [Member]
Availability under combined facilities
Amounts Outstanding	195
Letter of Credit [Member] | Unsecured letter of credit, expiring in February 2015 [Member]
Availability under combined facilities
Line of Credit Facility, Maximum Borrowing Capacity	100
Letter of Credit [Member] | Unsecured letter of credit facility expiring in August 2015 [Member]
Availability under combined facilities
Line of Credit Facility, Maximum Borrowing Capacity	125
Letter of Credit [Member] | DTE Energy [Member]
Availability under combined facilities
Amounts Outstanding	195
Letter of Credit [Member] | DTE Energy [Member] | Unsecured letter of credit, expiring in February 2015 [Member]
Availability under combined facilities
Line of Credit Facility, Maximum Borrowing Capacity	100
Letter of Credit [Member] | DTE Energy [Member] | Unsecured letter of credit facility expiring in August 2015 [Member]
Availability under combined facilities
Line of Credit Facility, Maximum Borrowing Capacity	125
Letter of Credit [Member] | Electric [Member]
Availability under combined facilities
Amounts Outstanding	0
Letter of Credit [Member] | Electric [Member] | Unsecured letter of credit, expiring in February 2015 [Member]
Availability under combined facilities
Line of Credit Facility, Maximum Borrowing Capacity	0
Letter of Credit [Member] | Electric [Member] | Unsecured letter of credit facility expiring in August 2015 [Member]
Availability under combined facilities
Line of Credit Facility, Maximum Borrowing Capacity	0
Letter of Credit [Member] | Gas [Member]
Availability under combined facilities
Amounts Outstanding	0
Letter of Credit [Member] | Gas [Member] | Unsecured letter of credit, expiring in February 2015 [Member]
Availability under combined facilities
Line of Credit Facility, Maximum Borrowing Capacity	0
Letter of Credit [Member] | Gas [Member] | Unsecured letter of credit facility expiring in August 2015 [Member]
Availability under combined facilities
Line of Credit Facility, Maximum Borrowing Capacity	0
Revolving Credit Facility [Member] | Unsecured revolving credit facility expiring in April 2018 [Member]
Availability under combined facilities
Line of Credit Facility, Maximum Borrowing Capacity	1,800
Revolving Credit Facility [Member] | DTE Energy [Member] | Unsecured revolving credit facility expiring in April 2018 [Member]
Availability under combined facilities
Line of Credit Facility, Maximum Borrowing Capacity	1,200
Revolving Credit Facility [Member] | Electric [Member] | Unsecured revolving credit facility expiring in April 2018 [Member]
Availability under combined facilities
Line of Credit Facility, Maximum Borrowing Capacity	300
Revolving Credit Facility [Member] | Gas [Member] | Unsecured revolving credit facility expiring in April 2018 [Member]
Availability under combined facilities
Line of Credit Facility, Maximum Borrowing Capacity	300
Commercial Paper [Member]
Availability under combined facilities
Amounts Outstanding	375
Commercial Paper [Member] | DTE Energy [Member]
Availability under combined facilities
Amounts Outstanding	375
Commercial Paper [Member] | Electric [Member]
Availability under combined facilities
Amounts Outstanding	0
Commercial Paper [Member] | Gas [Member]
Availability under combined facilities
Amounts Outstanding	$ 0