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Asset Retirement Obligations (Tables)
 12 Months Ended
Dec. 31, 2014
Asset Retirement Obligation Disclosure [Abstract]  
Change in asset retirement obligations
The following schedule shows the change in our asset retirement obligations for 2014 and 2013 (dollars in millions):

 
2014
 
2013
Asset retirement obligations at the beginning of year
$
347

 
$
357

Changes attributable to:
 

 
 

Accretion expense
24

 
24

Settlements
(30
)
 
(12
)
Assumed SCE’s obligation
—

 
34

Estimated cash flow revisions
44

 
(56
)
Newly incurred obligation
6

 
—

Asset retirement obligations at the end of year
$
391

 
$
347