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Asset Retirement Obligations (Tables)
 12 Months Ended
Dec. 31, 2012
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, 2010
$
1,083

 
$
556

 
$
1,639

Liabilities incurred
3

 
3

 
6

Accretion expense
58

 
31

 
89

Revision in estimated cash flows - net
—

 
(123
)
(a) 
(123
)
Balances, December 31, 2011
1,144

 
467

 
1,611

Liabilities incurred
9

 
11

 
20

Accretion expense
62

 
32

 
94

Liabilities settled
(8
)
 
—

 
(8
)
Revision in estimated cash flows - net
(1
)
 
(1
)
 
(2
)
Balances, December 31, 2012
$
1,206

 
$
509

 
$
1,715

______________________
(a)
Primarily reflects the effect of revised cost estimates and probability assessments regarding when assets will be decommissioned.
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 5):

 
FPL
 
NEER
 
NEE
 
 
 
(millions)
 
 
Balances, December 31, 2012
$
2,845

 
$
1,272

 
$
4,117

Balances, December 31, 2011
$
2,612

 
$
1,130

 
$
3,742