Short-Term Credit Arrangements and Borrowings (Tables)

6 Months Ended

Jun. 30, 2016

Short-term Debt [Abstract]

Schedule of Line of Credit Facilities

The availability under the facilities in place at June 30, 2016 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 2021	1,200		400		300		1,900
	1,370		400		300		2,070
Amounts outstanding at June 30, 2016
Commercial paper issuances	175		—		—		175
Letters of credit	139		—		—		139
	314		—		—		314
Net availability at June 30, 2016	$	1,056	$	400	$	300	$	1,756