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Significant Accounting Policies (Financing Receivables Classified by Internal Grade of Credit Risk) (Details) $ in Millions	Sep. 30, 2025 USD ($)
Notes receivable
Year of Origination
2025	$ 133
2024	857
2023 and Prior	280
Total	1,270
Notes receivable | DTE Electric
Year of Origination
Total	158
Notes receivable | Internal grade 1
Year of Origination
2025	131
2024	4
2023 and Prior	27
Total	162
Notes receivable | Internal grade 1 | DTE Electric
Year of Origination
Total	158
Notes receivable | Internal grade 1 | DTE Electric | Affiliates
Year of Origination
Total	131
Notes receivable | Internal grade 2
Year of Origination
2025	2
2024	853
2023 and Prior	253
Total	1,108
Notes receivable | Internal grade 2 | DTE Electric
Year of Origination
Total	0
Net investment in leases
Year of Origination
2025	0
2024	2
2023 and Prior	35
Total	37
Net investment in leases | DTE Electric
Year of Origination
Total	0
Net investment in leases | Internal grade 1
Year of Origination
2025	0
2024	0
2023 and Prior	35
Total	35
Net investment in leases | Internal grade 1 | DTE Electric
Year of Origination
Total	0
Net investment in leases | Internal grade 2
Year of Origination
2025	0
2024	2
2023 and Prior	0
Total	2
Net investment in leases | Internal grade 2 | DTE Electric
Year of Origination
Total	$ 0

X

- Definition

Financing Receivable, Excluding Accrued Interest, Originated Two or More Years before Latest Fiscal Year

+ References

No definition available.

+ Details

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X

- Definition

Amortized cost excluding accrued interest, before allowance for credit loss, of financing receivable. Excludes net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479344/326-20-45-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 3B
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-3B

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-5

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- References

No definition available.

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X

- Definition

Amortized cost excluding accrued interest, of financing receivable originated in current fiscal year. Excludes net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 79
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479294/326-20-55-79

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
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-Section 50
-Paragraph 6
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-6

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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-Section 50
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-3B

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X

- Definition

Amortized cost excluding accrued interest of financing receivable originated in fiscal year prior to current fiscal year. Excludes net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 79
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479294/326-20-55-79

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 6
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-6

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-3B

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- Details

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