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Asset Retirement Obligations (Tables)
 12 Months Ended
Dec. 31, 2019
Asset Retirement Obligation Disclosure [Abstract]  
Schedule of Change in Asset Retirement Obligations
Changes to asset retirement obligations for 2019, 2018, and 2017 were as follows:
 
2019
 
2018
 
2017
DTE Energy
(In millions)
Asset retirement obligations at January 1
$
2,469

 
$
2,320

 
$
2,197

Accretion
149

 
140

 
131

Liabilities incurred
20

 
27

 
2

Liabilities settled
(17
)
 
(16
)
 
(6
)
Revision in estimated cash flows
51

 
(2
)
 
(4
)
Asset retirement obligations at December 31
$
2,672

 
$
2,469

 
$
2,320


 
2019
 
2018
 
2017
DTE Electric
(In millions)
Asset retirement obligations at January 1
$
2,271

 
$
2,125

 
$
2,012

Accretion
138

 
129

 
120

Liabilities incurred
1

 
27

 
1

Liabilities settled
(14
)
 
(8
)
 
(2
)
Revision in estimated cash flows
51

 
(2
)
 
(6
)
Asset retirement obligations at December 31
$
2,447

 
$
2,271

 
$
2,125