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Asset Retirement Obligations (Tables)
6 Months Ended
Jun. 30, 2015
Asset Retirement Obligation Disclosure [Abstract]  
Schedule of Change in Asset Retirement Obligation
A reconciliation of the ARO for the six months ended June 30, 2015 follows:
 
DTE Energy
 
DTE Electric
 
(In millions)
Asset retirement obligations at December 31, 2014
$
1,962

 
$
1,796

Accretion
59

 
54

Revision in estimated cash flows
136

 
136

Asset retirement obligations at June 30, 2015
$
2,157

 
$
1,986