XML 63 R41.htm IDEA: XBRL DOCUMENT v3.8.0.1
Asset Retirement Obligations (Tables)
 12 Months Ended
Dec. 31, 2017
Asset Retirement Obligation Disclosure [Abstract]  
Schedule of Change in Asset Retirement Obligations
A reconciliation of the asset retirement obligations for 2017 follows:
 
DTE Energy
 
DTE Electric
 
(In millions)
Asset retirement obligations at December 31, 2016
$
2,197

 
$
2,012

Accretion
131

 
120

Liabilities incurred
2

 
1

Liabilities settled
(6
)
 
(2
)
Revision in estimated cash flows
(4
)
 
(6
)
Asset retirement obligations at December 31, 2017
$
2,320

 
$
2,125