Regulatory Matters (Schedule of Regulatory Liabilities) (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Regulatory Liabilities [Line Items]
Regulatory liabilities	$ 3,402	$ 3,329
Less amount included in Current Liabilities	(39)	(65)
Regulatory liabilities, noncurrent	3,363	3,264
Refundable federal income taxes
Regulatory Liabilities [Line Items]
Regulatory liabilities	2,255	2,359
Removal costs liability
Regulatory Liabilities [Line Items]
Regulatory liabilities	831	700
Negative other postretirement offset
Regulatory Liabilities [Line Items]
Regulatory liabilities	122	93
Non-service pension and other postretirement costs
Regulatory Liabilities [Line Items]
Regulatory liabilities	78	46
COVID-19 voluntary refund
Regulatory Liabilities [Line Items]
Regulatory liabilities	30	0
Renewable energy
Regulatory Liabilities [Line Items]
Regulatory liabilities	21	54
Accrued GCR refund
Regulatory Liabilities [Line Items]
Regulatory liabilities	20	23
Other
Regulatory Liabilities [Line Items]
Regulatory liabilities	45	54
DTE Electric
Regulatory Liabilities [Line Items]
Regulatory liabilities	2,450	2,586
Less amount included in Current Liabilities	(18)	(40)
Regulatory liabilities, noncurrent	2,432	2,546
DTE Electric | Refundable federal income taxes
Regulatory Liabilities [Line Items]
Regulatory liabilities	1,827	1,911
DTE Electric | Removal costs liability
Regulatory Liabilities [Line Items]
Regulatory liabilities	410	483
DTE Electric | Negative other postretirement offset
Regulatory Liabilities [Line Items]
Regulatory liabilities	86	69
DTE Electric | Non-service pension and other postretirement costs
Regulatory Liabilities [Line Items]
Regulatory liabilities	36	21
DTE Electric | COVID-19 voluntary refund
Regulatory Liabilities [Line Items]
Regulatory liabilities	30	0
DTE Electric | Renewable energy
Regulatory Liabilities [Line Items]
Regulatory liabilities	21	54
DTE Electric | Accrued GCR refund
Regulatory Liabilities [Line Items]
Regulatory liabilities	0	0
DTE Electric | Other
Regulatory Liabilities [Line Items]
Regulatory liabilities	$ 40	$ 48