Significant Accounting Policies (Tables)

9 Months Ended

Sep. 30, 2020

Accounting Policies [Abstract]

Schedule of Other Income

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

	Three Months Ended September 30,				Nine Months Ended September 30,
	2020		2019		2020		2019
	(In millions)
Equity earnings of equity method investees	$	37	$	34	$	96	$	77
Income from REF entities	43		40		95		96
Gains from equity and fixed income securities	2		3		24		27
Contract services	7		7		20		21
Gas Storage and Pipelines post-acquisition settlement	20		—		20		—
Allowance for equity funds used during construction	6		5		19		18
Other	5		9		12		20
	$	120	$	98	$	286	$	259

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

	Three Months Ended September 30,				Nine Months Ended September 30,
	2020		2019		2020		2019
	(In millions)
Gains from equity and fixed income securities allocated from DTE Energy	$	2	$	3	$	24	$	27
Contract services	7		7		20		23
Allowance for equity funds used during construction	6		5		18		17
Other	3		5		6		11
	$	18	$	20	$	68	$	78

Schedule of Effective Tax Rates

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

	Effective Tax Rate
	Three Months Ended September 30,				Nine Months Ended September 30,
	2020		2019		2020		2019
DTE Energy	12	%	13	%	10	%	12	%
DTE Electric	13	%	16	%	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 September 30, 2020.

	DTE Energy								DTE Electric
	Year of origination
	2020		2019		2018 and prior		Total		2020 and prior
	(In millions)
Notes receivable
Internal grade 1	$	—	$	18	$	9	$	27	$	18
Internal grade 2	60		19		6		85		—
Total notes receivable(a)	$	60	$	37	$	15	$	112	$	18
Net investment in leases
Net investment in leases, internal grade 1	$	8	$	—	$	40	$	48	$	—
Net investment in leases, internal grade 2	132		—		1		133		—
Total net investment in leases(a)	$	140	$	—	$	41	$	181	$	—

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(a)For DTE Energy, included in Current Assets — Other and Other Assets — Notes Receivable on the Consolidated Statements of Financial Position. For DTE Electric, included in Current Assets — Other and Other Assets — Other on the Consolidated Statements of Financial Position.

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 September 30, 2020.

	DTE Energy						DTE Electric
	Trade accounts receivable		Other receivables		Total		Trade and other accounts receivable
	(In millions)
Beginning reserve balance, January 1, 2020	$	87	$	4	$	91	$	46
Current period provision	73		2		75		47
Write-offs charged against allowance	(117)		(3)		(120)		(68)
Recoveries of amounts previously written off	41		—		41		24
Ending reserve balance, September 30, 2020	$	84	$	3	$	87	$	49