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Regulatory Matters (Schedule of Regulatory Assets) (Details) - USD ($)
$ in Millions
Dec. 31, 2015
Dec. 31, 2014
Regulatory Assets [Line Items]    
Regulatory Assets $ 3,724 $ 3,727
Less amount included in Current Assets (32) (76)
Regulatory Assets, Noncurrent 3,692 3,651
Securitized regulatory assets 0 34
Pension    
Regulatory Assets [Line Items]    
Regulatory Assets 2,112 2,284
Other postretirement costs    
Regulatory Assets [Line Items]    
Regulatory Assets 256 234
Asset retirement obligation    
Regulatory Assets [Line Items]    
Regulatory Assets 565 448
Recoverable Michigan income taxes    
Regulatory Assets [Line Items]    
Regulatory Assets 248 267
Removal costs asset    
Regulatory Assets [Line Items]    
Regulatory Assets 118 15
Unamortized loss on reacquired debt    
Regulatory Assets [Line Items]    
Regulatory Assets 63 67
Other recoverable income taxes    
Regulatory Assets [Line Items]    
Regulatory Assets 61 66
Deferred environmental costs    
Regulatory Assets [Line Items]    
Regulatory Assets 54 59
Transitional Reconciliation Mechanism    
Regulatory Assets [Line Items]    
Regulatory Assets 43 14
Cost to achieve Performance Excellence Process    
Regulatory Assets [Line Items]    
Regulatory Assets 33 54
Accrued PSCR/GCR revenue    
Regulatory Assets [Line Items]    
Regulatory Assets 12 61
Recoverable income taxes related to Securitized regulatory assets    
Regulatory Assets [Line Items]    
Regulatory Assets 0 19
Other    
Regulatory Assets [Line Items]    
Regulatory Assets 159 139
DTE Electric    
Regulatory Assets [Line Items]    
Regulatory Assets 2,986 2,959
Less amount included in Current Assets (17) (46)
Regulatory Assets, Noncurrent 2,969 2,913
Securitized regulatory assets 0 34
DTE Electric | Pension    
Regulatory Assets [Line Items]    
Regulatory Assets 1,592 1,743
DTE Electric | Other postretirement costs    
Regulatory Assets [Line Items]    
Regulatory Assets 198 191
DTE Electric | Asset retirement obligation    
Regulatory Assets [Line Items]    
Regulatory Assets 565 448
DTE Electric | Recoverable Michigan income taxes    
Regulatory Assets [Line Items]    
Regulatory Assets 203 220
DTE Electric | Removal costs asset    
Regulatory Assets [Line Items]    
Regulatory Assets 118 15
DTE Electric | Unamortized loss on reacquired debt    
Regulatory Assets [Line Items]    
Regulatory Assets 41 44
DTE Electric | Other recoverable income taxes    
Regulatory Assets [Line Items]    
Regulatory Assets 61 66
DTE Electric | Deferred environmental costs    
Regulatory Assets [Line Items]    
Regulatory Assets 0 0
DTE Electric | Transitional Reconciliation Mechanism    
Regulatory Assets [Line Items]    
Regulatory Assets 43 14
DTE Electric | Cost to achieve Performance Excellence Process    
Regulatory Assets [Line Items]    
Regulatory Assets 28 46
DTE Electric | Accrued PSCR/GCR revenue    
Regulatory Assets [Line Items]    
Regulatory Assets 0 34
DTE Electric | Recoverable income taxes related to Securitized regulatory assets    
Regulatory Assets [Line Items]    
Regulatory Assets 0 19
DTE Electric | Other    
Regulatory Assets [Line Items]    
Regulatory Assets $ 137 $ 119