Short-Term Credit Arrangements and Borrowings (Tables)

3 Months Ended

Mar. 31, 2016

Short-term Debt [Abstract]

Schedule of Line of Credit Facilities

The availability under the facilities in place at March 31, 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 2020	1,200		400		300		1,900
	1,370		400		300		2,070
Amounts outstanding at March 31, 2016
Commercial paper issuances	71		211		83		365
Letters of credit	167		—		—		167
	238		211		83		532
Net availability at March 31, 2016	$	1,132	$	189	$	217	$	1,538