Significant Accounting Policies (Financing Receivables Classified by Internal Grade of Credit Risk) (Details) $ in Millions	Dec. 31, 2024 USD ($)
Notes receivable
Financing receivables by year of origination
2024	$ 622
2023	7
2022 and prior	257
Total	886
Notes receivable | DTE Electric
Financing receivables by year of origination
Total	44
Notes receivable | Internal grade 1
Financing receivables by year of origination
2024	0
2023	1
2022 and prior	4
Total	5
Notes receivable | Internal grade 1 | DTE Electric
Financing receivables by year of origination
Total	43
Notes receivable | Internal grade 1 | DTE Electric | Affiliates
Financing receivables by year of origination
Total	42
Notes receivable | Internal grade 2
Financing receivables by year of origination
2024	622
2023	6
2022 and prior	253
Total	881
Notes receivable | Internal grade 2 | DTE Electric
Financing receivables by year of origination
Total	1
Net investment in leases
Financing receivables by year of origination
2024	4
2023	0
2022 and prior	36
Total	40
Net investment in leases | DTE Electric
Financing receivables by year of origination
Total	0
Net investment in leases | Internal grade 1
Financing receivables by year of origination
2024	0
2023	0
2022 and prior	36
Total	36
Net investment in leases | Internal grade 1 | DTE Electric
Financing receivables by year of origination
Total	0
Net investment in leases | Internal grade 2
Financing receivables by year of origination
2024	4
2023	0
2022 and prior	0
Total	4
Net investment in leases | Internal grade 2 | DTE Electric
Financing receivables by year of origination
Total	$ 0