Short-Term Credit Arrangements and Borrowings (Tables)

12 Months Ended

Dec. 31, 2016

Short-term Debt [Abstract]

Schedule of Line of Credit Facilities

The availability under the facilities in place at December 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 2021	1,200		400		300		1,900
	1,370		400		300		2,070
Amounts outstanding at December 31, 2016
Commercial paper issuances	257		62		180		499
Letters of credit	154		—		—		154
	411		62		180		653
Net availability at December 31, 2016	$	959	$	338	$	120	$	1,417