Short-Term Credit Arrangements and Borrowings (Tables)

12 Months Ended

Dec. 31, 2019

Short-term Debt [Abstract]

Schedule of Line of Credit Facilities

The availability under the facilities in place at December 31, 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 August 2021	110		—		—		110
Unsecured revolving credit facility, expiring April 2024	1,500		500		300		2,300
	1,760		500		300		2,560
Amounts outstanding at December 31, 2019
Commercial paper issuances	280		354		194		828
Letters of credit	229		—		—		229
	509		354		194		1,057
Net availability at December 31, 2019	$	1,251	$	146	$	106	$	1,503