Regulatory Matters (Schedule of Regulatory Liabilities) (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Regulatory Liabilities [Line Items]
Regulatory liabilities	$ 3,048	$ 2,893
Less amount included in Current Liabilities	(126)	(18)
Regulatory liabilities, noncurrent	2,922	2,875
Refundable federal income taxes
Regulatory Liabilities [Line Items]
Regulatory liabilities	2,410	2,384
Removal costs liability
Regulatory Liabilities [Line Items]
Regulatory liabilities	253	265
TCJA rate reduction liability
Regulatory Liabilities [Line Items]
Regulatory liabilities	118	0
Negative other postretirement offset
Regulatory Liabilities [Line Items]
Regulatory liabilities	101	80
Renewable energy
Regulatory Liabilities [Line Items]
Regulatory liabilities	86	112
Refundable self-implemented rates
Regulatory Liabilities [Line Items]
Regulatory liabilities	26	2
Negative pension offset
Regulatory Liabilities [Line Items]
Regulatory liabilities	9	21
Fermi 2 refueling outage
Regulatory Liabilities [Line Items]
Regulatory liabilities	4	15
Other
Regulatory Liabilities [Line Items]
Regulatory liabilities	41	14
DTE Electric
Regulatory Liabilities [Line Items]
Regulatory liabilities	2,269	2,154
Less amount included in Current Liabilities	(98)	(17)
Regulatory liabilities, noncurrent	2,171	2,137
DTE Electric | Refundable federal income taxes
Regulatory Liabilities [Line Items]
Regulatory liabilities	1,958	1,946
DTE Electric | Removal costs liability
Regulatory Liabilities [Line Items]
Regulatory liabilities	0	0
DTE Electric | TCJA rate reduction liability
Regulatory Liabilities [Line Items]
Regulatory liabilities	93	0
DTE Electric | Negative other postretirement offset
Regulatory Liabilities [Line Items]
Regulatory liabilities	79	67
DTE Electric | Renewable energy
Regulatory Liabilities [Line Items]
Regulatory liabilities	86	112
DTE Electric | Refundable self-implemented rates
Regulatory Liabilities [Line Items]
Regulatory liabilities	26	2
DTE Electric | Negative pension offset
Regulatory Liabilities [Line Items]
Regulatory liabilities	0	0
DTE Electric | Fermi 2 refueling outage
Regulatory Liabilities [Line Items]
Regulatory liabilities	4	15
DTE Electric | Other
Regulatory Liabilities [Line Items]
Regulatory liabilities	$ 23	$ 12