Regulatory Matters (Regulatory Liabilities) (Details) - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024
Regulatory Liabilities [Line Items]
Regulatory liabilities	$ 2,988	$ 3,037
Less amount included in Current Liabilities	(107)	(181)
Regulatory liabilities, noncurrent	2,881	2,856
Refundable federal income taxes
Regulatory Liabilities [Line Items]
Regulatory liabilities	1,646	1,733
Removal costs liability
Regulatory Liabilities [Line Items]
Regulatory liabilities	511	506
Non-service pension and other postretirement costs
Regulatory Liabilities [Line Items]
Regulatory liabilities	271	255
Negative other postretirement offset
Regulatory Liabilities [Line Items]
Regulatory liabilities	205	214
Renewable energy
Regulatory Liabilities [Line Items]
Regulatory liabilities	196	90
Accrued PSCR/GCR refund
Regulatory Liabilities [Line Items]
Regulatory liabilities	43	136
Other
Regulatory Liabilities [Line Items]
Regulatory liabilities	116	103
DTE Electric
Regulatory Liabilities [Line Items]
Regulatory liabilities	1,861	1,909
Less amount included in Current Liabilities	(63)	(156)
Regulatory liabilities, noncurrent	1,798	1,753
DTE Electric | Refundable federal income taxes
Regulatory Liabilities [Line Items]
Regulatory liabilities	1,318	1,389
DTE Electric | Removal costs liability
Regulatory Liabilities [Line Items]
Regulatory liabilities	0	0
DTE Electric | Non-service pension and other postretirement costs
Regulatory Liabilities [Line Items]
Regulatory liabilities	103	94
DTE Electric | Negative other postretirement offset
Regulatory Liabilities [Line Items]
Regulatory liabilities	133	139
DTE Electric | Renewable energy
Regulatory Liabilities [Line Items]
Regulatory liabilities	196	90
DTE Electric | Accrued PSCR/GCR refund
Regulatory Liabilities [Line Items]
Regulatory liabilities	0	111
DTE Electric | Other
Regulatory Liabilities [Line Items]
Regulatory liabilities	$ 111	$ 86