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Asset Retirement Obligations (Tables) | 12 Months Ended
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Dec. 31, 2020
Asset Retirement Obligations [Abstract] |
Asset retirement obligation, roll forward analysis | A rollforward of NEE's and FPL's AROs is as follows:
| NEE |  | FPL |
| (millions) |
Balances, December 31, 2018 | $ | 3,135 |  |  | $ | 2,147 |  |
Liabilities incurred | 100 |  |  | 1 |  |
Accretion expense | 172 |  |  | 107 |  |
Liabilities settled | (65) |  | (a) | (1) |  |
Revision in estimated cash flows - net | 32 |  | (b) | 14 |  | (b)
Additions from acquisitions | 132 |  | (c) | — |  |
Balances, December 31, 2019 | 3,506 |  | (d) | 2,268 |  | (d)
Liabilities incurred | 138 |  |  | — |  |
Accretion expense | 169 |  |  | 100 |  |
Liabilities settled | (53) |  |  | (6) |  |
Revision in estimated cash flows - net | (594) |  | (e) | (558) |  | (e)
Balances, December 31, 2020 | $ | 3,166 |  | (d) | $ | 1,804 |  | (d)
______________________ (a)Primarily reflects sales of ownership interests to subsidiaries of NEP. See Note 1 - Disposal of Businesses/Assets. (b)Includes an increase of approximately $75 million for additional estimated ash pond closure costs at Scherer, partly offset by a decrease of approximately $71 million due to the approval of Turkey Point Units Nos. 3 and 4 license renewals for an additional 20 years. (c)See Note 6 for 2019 acquisitions. (d)Includes the current portion of AROs as of December 31, 2020 and 2019 of approximately $109 million ($21 million for FPL) and $49 million (none for FPL), respectively, which is included in other current liabilities on NEE's and FPL's consolidated balance sheets. (e)Primarily reflects the effect of revised cost estimates for decommissioning FPL's nuclear units consistent with the updated nuclear decommissioning studies filed with the FPSC in December 2020.
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 - Special Use Funds). 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.
| NEE |  | FPL
| (millions)
Balances, December 31, 2020 | $ | 7,703 |  |  | $ | 5,271 |
Balances, December 31, 2019 | $ | 6,880 |  |  | $ | 4,697 |

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- Definition Disclosure of the restricted funds for the payment of future expenditures to decommission nuclear units included in special use funds on the consolidated balance sheets. + References No definition available. + Details
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- Definition Tabular disclosure of the changes in carrying amount of a liability for asset retirement obligations, for changes such as new obligations, changes in estimates of existing obligations, spending on existing obligations, property dispositions, and foreign currency translation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13201-110859 + Details
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