Short-Term Credit Arrangements and Borrowings (Tables)

9 Months Ended

Sep. 30, 2015

Short-term Debt [Abstract]

Schedule of Line of Credit Facilities

The availability under the facilities in place at September 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 September 2017	70		—		—		70
Unsecured revolving credit facility, expiring April 2020	1,200		400		300		1,900
	1,370		400		300		2,070
Amounts outstanding at September 30, 2015:
Commercial paper issuances	11		46		128		185
Letters of credit	185		—		—		185
	196		46		128		370
Net availability at September 30, 2015	$	1,174	$	354	$	172	$	1,700