Short-Term Credit Arrangements and Borrowings (Tables)

3 Months Ended

Mar. 31, 2015

Short-term Debt [Abstract]

Schedule of Line of Credit Facilities

The availability under the facilities in place at March 31, 2015 is shown in the following table:

	DTE Energy		DTE Electric		DTE Gas		Total
	(In millions)
Unsecured letter of credit facility, expiring in February 2017	$	100	$	—	$	—	$	100
Unsecured letter of credit facility, expiring in August 2015	125		—		—		125
Unsecured revolving credit facility, expiring April 2018	1,200		300		300		1,800
	1,425		300		300		2,025
Amounts outstanding at March 31, 2015:
Letters of credit	255		—		—		255
	255		—		—		255
Net availability at March 31, 2015	$	1,170	$	300	$	300	$	1,770