Short-Term Credit Arrangements and Borrowings (Tables)

3 Months Ended

Mar. 31, 2017

Short-term Debt [Abstract]

Schedule of Line of Credit Facilities

The availability under the facilities in place at March 31, 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(a)	$	150	$	—	$	—	$	150
Unsecured letter of credit facility, expiring in September 2017	70		—		—		70
Unsecured revolving credit facility, expiring April 2021	1,200		400		300		1,900
	1,420		400		300		2,120
Amounts outstanding at March 31, 2017
Commercial paper issuances	—		59		—		59
Letters of credit	139		—		—		139
	139		59		—		198
Net availability at March 31, 2017	$	1,281	$	341	$	300	$	1,922

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(a) In February 2017, DTE Energy amended its $100 million letter of credit facility. The facility's maturity date was amended from February 2017 to February 2019. As part of this amendment, DTE Energy increased its $100 million letter of credit facility to $150 million.