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Asset Retirement Obligations (Tables)
12 Months Ended
Dec. 31, 2014
Asset Retirement Obligations [Abstract]  
Asset retirement obligation, roll forward analysis
A rollforward of NEE's and FPL's ARO is as follows:

 
FPL
 
NEER
 
NEE
 
 
 
(millions)
 
 
Balances, December 31, 2012
$
1,206

 
$
509

 
$
1,715

Liabilities incurred
1

 
24

 
25

Accretion expense
64

 
35

 
99

Liabilities settled
(1
)
 
(2
)
 
(3
)
Revision in estimated cash flows - net
15

 
(1
)
 
14

Balances, December 31, 2013
1,285

 
565

 
1,850

Liabilities incurred
1

 
29

 
30

Accretion expense
70

 
38

 
108

Liabilities settled

 
(1
)
 
(1
)
Revision in estimated cash flows - net
(1
)
 

 
(1
)
Balances, December 31, 2014
$
1,355

 
$
631

 
$
1,986



Funds restricted for decommissioning included in special use funds
Restricted funds for the payment of future expenditures to decommission NEE's and FPL's nuclear units included in special use funds on NEE's and FPL's consolidated balance sheets are as follows (see Note 4 - Special Use Funds):

 
FPL
 
NEER
 
NEE
 
 
 
(millions)
 
 
Balances, December 31, 2014
$
3,449

 
$
1,642

 
$
5,091

Balances, December 31, 2013
$
3,199

 
$
1,507

 
$
4,706