Short-Term Credit Arrangements and Borrowings (Tables)

12 Months Ended

Dec. 31, 2020

Short-term Debt [Abstract]

Schedule of Line of Credit Facilities

The availability under the facilities in place at December 31, 2020 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 term loan, expiring in November 2021	—		200		—		200
Unsecured Canadian revolving credit facility, expiring May 2023	86		—		—		86
Unsecured revolving credit facility, expiring April 2024	1,500		500		300		2,300
	1,846		700		300		2,846
Amounts outstanding at December 31, 2020
Letters of credit	193		—		—		193
Revolver borrowings	38		—		—		38
	231		—		—		231
Net availability at December 31, 2020	$	1,615	$	700	$	300	$	2,615