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Asset Retirement Obligations (Tables)
 12 Months Ended
Dec. 31, 2018
Asset Retirement Obligations [Abstract]  
Asset retirement obligation, roll forward analysis
A rollforward of NEE's and FPL's AROs is as follows:
 
FPL
 
NEER
 
NEE
 
 
 
(millions)
 
 
Balances, December 31, 2016
$
1,919

 
$
817

 
$
2,736

Liabilities incurred
17

 
59

 
76

Accretion expense
96

 
52

 
148

Liabilities settled
—

 
(14
)
(a) 
(14
)
Revision in estimated cash flows - net
15

 
70

(b) 
85

Balances, December 31, 2017
2,047

 
984

 
3,031

Liabilities incurred
—

 
49

 
49

Accretion expense
101

 
57

 
158

Liabilities settled
(1
)
 
(25
)
(c) 
(26
)
Revision in estimated cash flows - net
—

 
4


4

Impact of NEP deconsolidation
—

 
(81
)
(d) 
(81
)
Balances, December 31, 2018
$
2,147

 
$
988

 
$
3,135


______________________
(a)
Includes approximately $13 million reclassified to liabilities associated with assets held for sale included in other current liabilities in NEE's consolidated balance sheets.
(b)
Primarily reflects the effect of the revised cost estimate due to the change in useful life of Duane Arnold. See Note 5 - Nonrecurring Fair Value Measurements.
(c)
Primarily reflects sale of ownership interests to a subsidiary of NEP. See Note 1 - Disposal of a Business/Assets.
(d)
See Note 1 - NextEra Energy Partners, LP.
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 - Special Use Funds):
 
FPL
 
NEER
 
NEE
 
 
 
(millions)
 
 
Balances, December 31, 2018
$
3,987

 
$
1,831

 
$
5,818

Balances, December 31, 2017
$
4,090

 
$
1,913

 
$
6,003