Short-Term Credit Arrangements and Borrowings (Tables)

6 Months Ended

Jun. 30, 2019

Short-term Debt [Abstract]

Schedule of Line of Credit Facilities

The availability under the facilities in place at June 30, 2019 is shown in the following table:

	DTE Energy		DTE Electric		DTE Gas		Total
	(In millions)
Unsecured letter of credit facility, expiring in February 2021	$	150	$	—	$	—	$	150
Unsecured letter of credit facility, expiring in September 2019	70		—		—		70
Unsecured revolving credit facility, expiring April 2024	1,500		500		300		2,300
	1,720		500		300		2,520
Amounts outstanding at June 30, 2019
Commercial paper issuances	—		—		3		3
Letters of credit	179		—		—		179
	179		—		3		182
Net availability at June 30, 2019	$	1,541	$	500	$	297	$	2,338