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Document and Entity Information Document and Entity Information - USD ($)
$ in Billions
 12 Months Ended
Dec. 31, 2020
Jan. 29, 2021
Jun. 30, 2020
Entity Information [Line Items]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2020    
Current Fiscal Year End Date --12-31    
Document Transition Report false    
Entity File Number 1-11607    
Entity Registrant Name DTE Energy Co    
Entity Incorporation, State or Country Code MI    
Entity Tax Identification Number 38-3217752    
Entity Address, Address Line One One Energy Plaza    
Entity Address, City or Town Detroit    
Entity Address, State or Province MI    
Entity Address, Postal Zip Code 48226-1279    
City Area Code 313    
Local Phone Number 235-4000    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Large Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
ICFR Auditor Attestation Flag true    
Entity Shell Company false    
Entity Public Float     $ 20.5
Entity Common Stock, Shares Outstanding   193,773,687  
Documents Incorporated by Reference
Certain information in DTE Energy's definitive Proxy Statement for its 2021 Annual Meeting of Common Shareholders to be held May 20, 2021, which will be filed with the Securities and Exchange Commission pursuant to Regulation 14A, not later than 120 days after the end of the registrant’s fiscal year covered by this report on Form 10-K, is incorporated herein by reference to Part III (Items 10, 11, 12, 13, and 14) of this Form 10-K.
This combined Form 10-K is filed separately by two registrants: DTE Energy and DTE Electric. Information contained herein relating to any individual registrant is filed by such registrant solely on its own behalf. DTE Electric makes no representation as to information relating exclusively to DTE Energy.
DTE Electric, an indirect wholly-owned subsidiary of DTE Energy, meets the conditions set forth in General Instructions I(1)(a) and (b) of Form 10-K and is therefore filing this form with the reduced disclosure format specified in General Instruction I(2) of Form 10-K.
    
Entity Central Index Key 0000936340    
Document Fiscal Year Focus 2020    
Document Fiscal Period Focus FY    
Amendment Flag false    
Common stock, without par value      
Entity Information [Line Items]      
Title of 12(b) Security Common stock, without par value    
Trading Symbol DTE    
Security Exchange Name NYSE    
2016 Series B 5.375% Junior Subordinated Debentures due 2076      
Entity Information [Line Items]      
Title of 12(b) Security 2016 Series B 5.375% Junior Subordinated Debentures due 2076    
Trading Symbol DTJ    
Security Exchange Name NYSE    
2016 Series F 6.00% Junior Subordinated Debentures due 2076      
Entity Information [Line Items]      
Title of 12(b) Security 2016 Series F 6.00% Junior Subordinated Debentures due 2076    
Trading Symbol DTY    
Security Exchange Name NYSE    
2017 Series E 5.25% Junior Subordinated Debentures due 2077      
Entity Information [Line Items]      
Title of 12(b) Security 2017 Series E 5.25% Junior Subordinated Debentures due 2077    
Trading Symbol DTW    
Security Exchange Name NYSE    
2019 6.25% Corporate Units      
Entity Information [Line Items]      
Title of 12(b) Security 2019 6.25% Corporate Units    
Trading Symbol DTP    
Security Exchange Name NYSE    
2020 Series G 4.375% Junior Subordinated Debentures due 2080      
Entity Information [Line Items]      
Title of 12(b) Security 2020 Series G 4.375% Junior Subordinated Debentures due 2080    
Trading Symbol DTB    
Security Exchange Name NYSE    
DTE Electric      
Entity Information [Line Items]      
Entity File Number 1-2198    
Entity Registrant Name DTE Electric Co    
Entity Incorporation, State or Country Code MI    
Entity Tax Identification Number 38-0478650    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Non-accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
ICFR Auditor Attestation Flag false    
Entity Shell Company false    
Entity Common Stock, Shares Outstanding   138,362,324  
Entity Central Index Key 0000028385