Significant Accounting Policies (Financing Receivables Classified by Internal Grade of Credit Risk) (Details) $ in Millions	Dec. 31, 2023 USD ($)
Notes receivable
Financing receivables by year of origination
2023	$ 42
2022	112
2021 and prior	21
Total	175
Notes receivable | DTE Electric
Financing receivables by year of origination
Total	19
Notes receivable | Internal grade 1
Financing receivables by year of origination
2023	19
2022	0
2021 and prior	4
Total	23
Notes receivable | Internal grade 1 | DTE Electric
Financing receivables by year of origination
Total	18
Notes receivable | Internal grade 2
Financing receivables by year of origination
2023	23
2022	112
2021 and prior	17
Total	152
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
2023	0
2022	66
2021 and prior	221
Total	287
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
2023	0
2022	0
2021 and prior	37
Total	37
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
2023	0
2022	66
2021 and prior	184
Total	250
Net investment in leases | Internal grade 2 | DTE Electric
Financing receivables by year of origination
Total	$ 0