Commitments and Contingencies (Purchase Commitments) (Details) $ in Millions	12 Months Ended
Dec. 31, 2021 USD ($)
Purchase Obligation, Fiscal Year Maturity [Abstract]
2022	$ 3,290
2023	1,796
2024	1,277
2025	585
2026	460
2027 and thereafter	1,966
Total	9,374
Long-term power purchase agreements
Purchase Obligation, Fiscal Year Maturity [Abstract]
2022	87
2023	92
2024	103
2025	103
2026	103
2027 and thereafter	986
Total	1,474
Other purchase commitments
Purchase Obligation, Fiscal Year Maturity [Abstract]
2022	3,203
2023	1,704
2024	1,174
2025	482
2026	357
2027 and thereafter	980
Total	7,900
DTE Electric
Purchase Obligation, Fiscal Year Maturity [Abstract]
2022	457
2023	499
2024	539
2025	305
2026	227
2027 and thereafter	1,281
Total	3,308
DTE Electric \| Long-term power purchase agreements
Purchase Obligation, Fiscal Year Maturity [Abstract]
2022	92
2023	97
2024	108
2025	108
2026	109
2027 and thereafter	1,006
Total	1,520
DTE Electric \| Other purchase commitments
Purchase Obligation, Fiscal Year Maturity [Abstract]
2022	365
2023	402
2024	431
2025	197
2026	118
2027 and thereafter	275
Total	$ 1,788
DTE Electric \| Minimum
Purchase Obligation, Fiscal Year Maturity [Abstract]
Share of plant output	28.00%
DTE Electric \| Maximum
Purchase Obligation, Fiscal Year Maturity [Abstract]
Share of plant output	100.00%

Share of plant output being purchased under a long-term contract to purchase electricity from a production plant constructed and financed by a public utility district, cooperative, or other organization.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 980
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 10.D)
-URI http://asc.fasb.org/extlink&oid=122136240&loc=d3e659339-123030

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Minimum amount of purchase arrangement in which the entity has agreed to expend funds to procure goods or services from a supplier.

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Amount of purchase arrangement to be paid in second fiscal year following current fiscal year. Includes, but is not limited to, recorded and unrecorded purchase obligations, long-term purchase commitment, and short-term purchase commitment. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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