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Short-Term Credit Arrangements and Borrowings (Details Textuals)
Apr. 28, 2020
USD ($)
Mar. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Short-term Debt [Line Items]      
Face amount of loan   $ 1,100,000,000  
Amounts outstanding   1,362,000,000  
Unsecured term loan      
Short-term Debt [Line Items]      
Amounts outstanding   500,000,000  
Letters of credit      
Short-term Debt [Line Items]      
Amounts outstanding   231,000,000  
Unsecured Term Loan Executed in March 2020 | Unsecured term loan      
Short-term Debt [Line Items]      
Face amount of loan   500,000,000  
Amount drawn   500,000,000  
DTE Electric      
Short-term Debt [Line Items]      
Amounts outstanding   $ 71,000,000  
Ratio of indebtedness to net capital   0.53  
DTE Electric | Unsecured term loan      
Short-term Debt [Line Items]      
Amounts outstanding   $ 0  
DTE Electric | Letters of credit      
Short-term Debt [Line Items]      
Amounts outstanding   0  
DTE Electric | Unsecured Term Loan, Expiring April 2021, Funded | Unsecured term loan | Subsequent Event      
Short-term Debt [Line Items]      
Face amount of loan $ 200,000,000    
Amount drawn 200,000,000    
DTE Electric | Unsecured Term Loan, Expiring April 2021, Unfunded | Unsecured term loan | Subsequent Event      
Short-term Debt [Line Items]      
Face amount of loan 200,000,000    
Amount drawn 0    
DTE Gas      
Short-term Debt [Line Items]      
Amounts outstanding   $ 153,000,000  
Ratio of indebtedness to net capital   0.47  
DTE Gas | Unsecured term loan      
Short-term Debt [Line Items]      
Amounts outstanding   $ 0  
DTE Gas | Letters of credit      
Short-term Debt [Line Items]      
Amounts outstanding   0  
DTE Gas | Unsecured Term Loan, Expiring April 2021 | Unsecured term loan | Subsequent Event      
Short-term Debt [Line Items]      
Face amount of loan 100,000,000    
Amount drawn $ 100,000,000    
DTE Energy      
Short-term Debt [Line Items]      
Amounts outstanding   $ 1,138,000,000  
Ratio of indebtedness to net capital   0.59  
DTE Energy | Unsecured term loan      
Short-term Debt [Line Items]      
Amounts outstanding   $ 500,000,000  
DTE Energy | Letters of credit      
Short-term Debt [Line Items]      
Amounts outstanding   231,000,000  
DTE Energy | Demand financing agreement      
Short-term Debt [Line Items]      
Maximum borrowing capacity, financing agreement   100,000,000  
Maximum additional margin financing   50,000,000  
Amount outstanding   96,000,000 $ 114,000,000
DTE Energy | Demand financing agreement plus letter of credit      
Short-term Debt [Line Items]      
Maximum borrowing capacity, financing agreement   150,000,000  
DTE Energy | Other outstanding letters of credit | Letters of credit      
Short-term Debt [Line Items]      
Amounts outstanding   $ 9,000,000  
Maximum      
Short-term Debt [Line Items]      
Ratio of indebtedness to net capital   0.65