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Asset Retirement Obligations
 12 Months Ended
Dec. 31, 2022
Asset Retirement Obligations [Abstract]  
Asset Retirement Obligations Asset Retirement Obligations
NEE's AROs relate primarily to decommissioning obligations of FPL's and NEER's nuclear units and to obligations for the dismantlement of certain of NEER's wind and solar facilities. For NEE's rate-regulated operations, including FPL, the accounting provisions result in timing differences in the recognition of legal asset retirement costs for financial reporting purposes and the method the regulator allows for recovery in rates. See Note 1 – Rate Regulation and – Decommissioning of Nuclear Plants, Dismantlement of Plants and Other Accrued Asset Removal Costs.

A rollforward of NEE's and FPL's AROs is as follows:
NEEFPL
(millions)
Balances, December 31, 2020$3,166 $1,936 
Liabilities incurred79 7 
Accretion expense141 78 
Liabilities settled(88)
(a)
(15)
Revision in estimated cash flows – net
(119)
(b)
101 
(c)
Balances, December 31, 20213,179 
(d)
2,107 
(d)
Liabilities incurred82 — 
Accretion expense145 81 
Liabilities settled(80)
(a)
(22)
Revision in estimated cash flows – net
2 10 

Balances, December 31, 2022$3,328 
(d)
$2,176 
(d)
______________________
(a)Includes approximately $27 million and $35 million related to project sales to NEP as well as other sales of businesses and assets during the years ending December 31, 2022 and 2021, respectively. See Note 1 – Disposal of Businesses/Assets and Sale of Noncontrolling Ownership Interests.
(b)The increase at FPL discussed in (c) was offset primarily by the effect of revised cost estimates and useful lives of NEER's solar facilities.
(c)Primarily reflects the effect of pending license extension requests of St. Lucie Units Nos. 1 and 2 for an additional 20 years.
(d)Includes the current portion of AROs as of December 31, 2022 and 2021 of approximately $83 million ($68 million for FPL) and $97 million ($58 million for FPL), respectively, which are included in other current liabilities on NEE's and FPL's consolidated balance sheets.

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, 2022$7,495 $5,220 
Balances, December 31, 2021$8,846 $6,082 

NEE and FPL have identified but not recognized ARO liabilities related to the majority of their electric transmission and distribution assets and pipelines resulting from easements over property not owned by NEE or FPL. These easements are generally perpetual and only require retirement action upon abandonment or cessation of use of the property or facility for its specified purpose. The related ARO liability is not estimable for such easements as NEE and FPL intend to use these properties
indefinitely. In the event NEE or FPL decide to abandon or cease the use of a particular easement, an ARO liability would be recorded at that time.