Long-Term Debt (Scheduled Debt Maturities) (Details) $ in Millions	Dec. 31, 2020 USD ($)
Maturities of Long-term Debt [Abstract]
2021	$ 462
2022	3,466
2023	1,177
2024	1,425
2025	1,220
2026 and Thereafter	11,853
Long-term debt, total	19,603
DTE Electric
Maturities of Long-term Debt [Abstract]
2021	462
2022	316
2023	202
2024	400
2025	350
2026 and Thereafter	6,578
Long-term debt, total	$ 8,308

Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 4
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Topic 235
-SubTopic 10
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