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Asset Retirement Obligations (Tables)
 12 Months Ended
Dec. 31, 2023
Asset Retirement Obligations [Abstract]  
Asset retirement obligation, roll forward analysis
A rollforward of NEE's and FPL's AROs is as follows:
NEEFPL
(millions)
Balances, December 31, 2021$3,179 $2,107 
Liabilities incurred82 — 
Accretion expense145 81 
Liabilities settled(80)
(a)
(22)
Revision in estimated cash flows – net
2 10 
Balances, December 31, 20223,328 
(b)
2,176 
(b)
Liabilities incurred100 — 
Accretion expense154 84 
Liabilities settled(90)
(a)
(66)
Revision in estimated cash flows – net
(55)(24)

Balances, December 31, 2023$3,437 
(b)
$2,170 
(b)
______________________
(a)Includes approximately $18 million and $27 million related to project sales to NEP as well as other sales of businesses and assets during the years ending December 31, 2023 and 2022, respectively. See Note 1 – Disposal of Businesses/Assets and Sale of Noncontrolling Ownership Interests.
(b)Includes the current portion of AROs as of December 31, 2023 and 2022 of approximately $34 million ($27 million for FPL) and $83 million ($68 million for FPL), respectively, which are included in other current liabilities on NEE's and FPL's consolidated balance sheets.
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 presented below (see Note 4). Duane Arnold is being actively decommissioned and was granted an exemption from the NRC, which allows for use of the funds for certain other site restoration activities in addition to decommissioning obligations recorded as AROs.
NEEFPL
(millions)
Balances, December 31, 2023$8,697 $6,049 
Balances, December 31, 2022$7,495 $5,220