Short-Term Credit Arrangements and Borrowings (Tables)

6 Months Ended

Jun. 30, 2017

Short-term Debt [Abstract]

Schedule of Line of Credit Facilities

The availability under the facilities in place at June 30, 2017 is shown in the following table:

	DTE Energy		DTE Electric		DTE Gas		Total
	(In millions)
Unsecured letter of credit facility, expiring in February 2019	$	150	$	—	$	—	$	150
Unsecured letter of credit facility, expiring in September 2017	70		—		—		70
Unsecured revolving credit facility, expiring April 2022	1,200		400		300		1,900
	1,420		400		300		2,120
Amounts outstanding at June 30, 2017
Commercial paper issuances	—		326		94		420
Letters of credit	102		—		—		102
	102		326		94		522
Net availability at June 30, 2017	$	1,318	$	74	$	206	$	1,598