Significant Accounting Policies (Tables)

3 Months Ended

Mar. 31, 2020

Accounting Policies [Abstract]

Schedule of Other Income

The following is a summary of DTE Energy's Other income:

	Three Months Ended March 31,
	2020		2019
	(In millions)
Equity earnings of equity method investees	$	29	$	23
Income from REF entities	23		27
Contract services	7		8
Allowance for equity funds used during construction	6		7
Gains from equity and fixed income securities	—		17
Other	—		6
	$	65	$	88

The following is a summary of DTE Electric's Other income:

	Three Months Ended March 31,
	2020		2019
	(In millions)
Contract services	$	7	$	8
Allowance for equity funds used during construction	6		6
Gains from equity and fixed income securities allocated from DTE Energy	—		17
Other	—		2
	$	13	$	33

Schedule of Effective Tax Rates

The interim effective tax rates of the Registrants are as follows:

	Effective Tax Rate
	Three Months Ended March 31,
	2020		2019
DTE Energy	13	%	12	%
DTE Electric	12	%	16	%

Schedule of Financing Receivables Classified by Internal Grade of Credit Risk

The following represents the Registrants' financing receivables by year of origination, classified by internal grade of credit risk. The related credit quality indicators and risk ratings utilized to develop the internal grades have been updated through March 2020.

	DTE Energy								DTE Electric
	Year of origination
	2020		2019		2018 and prior		Total		2020 and prior
	(In millions)
Notes receivable
Internal grade 1	$	2	$	9	$	9	$	20	$	11
Internal grade 2	10		31		7		48		—
Total notes receivable	$	12	$	40	$	16	$	68	$	11
Net investment in leases
Net investment in leases, internal grade 1	$	—	$	—	$	43	$	43	$	—
Net investment in leases, internal grade 2	133		—		1		134		—
Total net investment in leases	$	133	$	—	$	44	$	177	$	—

Schedule of Roll-Forward of Activity for Financing Receivables Credit Loss Reserves

The following table presents a roll-forward of the activity for the Registrants' financing receivables credit loss reserves as of March 31, 2020.

	DTE Energy									DTE Electric
	Trade accounts receivable			Other receivables			Total			Trade accounts receivable
	(In millions)
Beginning reserve balance at 1/1/2020	$	87		$	4		$	91		$	46
Current period provision	34			1			35			17
Write-offs charged against allowance	(51		)	(1		)	(52		)	(30		)
Recoveries of amounts previously written off	16			—			16			10
Ending reserve balance at 3/31/2020	$	86		$	4		$	90		$	43