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Asset Retirement Obligations (Tables)
 12 Months Ended
Dec. 31, 2016
Asset Retirement Obligation Disclosure [Abstract]  
Schedule of Change in Asset Retirement Obligations
A reconciliation of the asset retirement obligations for 2016 follows:
 
DTE Energy
 
DTE Electric
 
(In millions)
Asset retirement obligations at December 31, 2015
$
2,194

 
$
2,020

Accretion
129

 
119

Liabilities incurred
5

 
—

Liabilities settled
(6
)
 
(4
)
Revision in estimated cash flows(a)
(125
)
 
(123
)
Asset retirement obligations at December 31, 2016
$
2,197

 
$
2,012


_______________________________________
(a)
The revision in estimated cash flows was principally attributed to the extension of the operating license of Fermi 2 which permits the power plant to continue generating electricity until 2045. The extension approved by the NRC was received in December 2016. The original operating license for the plant would have expired in 2025.