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Asset Retirement Obligations (Tables)
 12 Months Ended
Dec. 31, 2018
Asset Retirement Obligation Disclosure [Abstract]  
Schedule of Change in Asset Retirement Obligations
A reconciliation of the asset retirement obligations for 2018 follows:
 
DTE Energy
 
DTE Electric
 
(In millions)
Asset retirement obligations at December 31, 2017
$
2,320

 
$
2,125

Accretion
140

 
129

Liabilities incurred
27

 
27

Liabilities settled
(16
)
 
(8
)
Revision in estimated cash flows
(2
)
 
(2
)
Asset retirement obligations at December 31, 2018
$
2,469

 
$
2,271