Short-Term Credit Arrangements and Borrowings (Tables)

6 Months Ended

Jun. 30, 2015

Short-term Debt [Abstract]

Schedule of Line of Credit Facilities

The availability under the facilities in place at June 30, 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 2020	1,200		400		300		1,900
	1,425		400		300		2,125
Amounts outstanding at June 30, 2015:
Letters of credit	170		—		—		170
	170		—		—		170
Net availability at June 30, 2015	$	1,255	$	400	$	300	$	1,955