Short-Term Credit Arrangements and Borrowings (Tables)

12 Months Ended

Dec. 31, 2014

Short-term Debt [Abstract]

Schedule of Line of Credit Facilities

The availability under the facilities in place at December 31, 2014 is shown in the following table:

	DTE Energy		DTE Electric		DTE Gas		Total
	(In millions)
Unsecured letter of credit facility, expiring in February 2015	$	100	$	—	$	—	$	100
Unsecured letter of credit facility, expiring in August 2015	125		—		—		125
Unsecured revolving credit facility, expiring April 2018	1,200		300		300		1,800
	1,425		300		300		2,025
Amounts outstanding at December 31, 2014:
Commercial paper issuances	203		50		145		398
Letters of credit	204		—		—		204
	407		50		145		602
Net availability at December 31, 2014	$	1,018	$	250	$	155	$	1,423