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Property, Plant and Equipment | 12 Months Ended
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Dec. 31, 2020
Jointly-Owned Electric Plants [Abstract] |
Jointly-Owned Electric Plants | Property, Plant and Equipment Property, plant and equipment consists of the following at December 31:
|  | NEE |  | FPL
|  | 2020 |  | 2019 |  | 2020 |  | 2019
|  | (millions)
Electric plant in service and other property |  | $ | 105,860 |  |  | $ | 96,093 |  |  | $ | 57,749 |  |  | $ | 54,523 |
Nuclear fuel |  | 1,604 |  |  | 1,755 |  |  | 1,143 |  |  | 1,153 |
Construction work in progress |  | 10,639 |  |  | 9,330 |  |  | 4,338 |  |  | 3,351 |
Property, plant and equipment, gross |  | 118,103 |  |  | 107,178 |  |  | 63,230 |  |  | 59,027 |
Accumulated depreciation and amortization |  | (26,300) |  |  | (25,168) |  |  | (14,297) |  |  | (13,953) |
Property, plant and equipment - net |  | $ | 91,803 |  |  | $ | 82,010 |  |  | $ | 48,933 |  |  | $ | 45,074 |
FPL - At December 31, 2020, FPL's gross investment in electric plant in service and other property for the electric generation, transmission, distribution and general facilities of FPL represented approximately 47%, 12%, 35% and 6%, respectively; the respective amounts at December 31, 2019 were 46%, 12%, 35% and 7%. Substantially all of FPL's properties are subject to the lien of FPL's mortgage, which secures most debt securities issued by FPL. The weighted annual composite depreciation and amortization rate for FPL's electric plant in service, including capitalized software, but excluding the effects of decommissioning, dismantlement and the depreciation adjustments discussed in the following sentence, was approximately 3.7%, 3.9% and 3.8% for 2020, 2019 and 2018, respectively. In accordance with the 2016 rate agreement (see Note 1 - Rate Regulation - FPL Base Rates Effective January 2017), FPL recorded the reversal of reserve amortization of approximately $1 million, $357 million and $541 million in 2020, 2019 and 2018, respectively. During 2020, 2019 and 2018, FPL capitalized AFUDC at a rate of 6.22%, 6.22% and 5.97%, respectively, which amounted to approximately $79 million, $80 million and $114 million, respectively. NEER - At December 31, 2020, wind, solar and nuclear plants represented approximately 55%, 13% and 8%, respectively, of NEER's depreciable electric plant in service and other property; the respective amounts at December 31, 2019 were 54%, 12% and 10%. The estimated useful lives of NEER's plants range primarily from 30 to 35 years for wind plants, 25 to 30 years for solar plants and 23 to 47 years for nuclear plants. NEER's oil and gas production assets represented approximately 14% and 15% of NEER's depreciable electric plant in service and other property at December 31, 2020 and 2019, respectively. A number of NEER's generation, regulated transmission and pipeline facilities are encumbered by liens securing various financings. The net book value of NEER's assets serving as collateral was approximately $11.0 billion at December 31, 2020. Interest capitalized on construction projects amounted to approximately $168 million, $135 million and $94 million during 2020, 2019 and 2018, respectively. Jointly-Owned Electric Plants - Certain NEE subsidiaries own undivided interests in the jointly-owned facilities described below, and are entitled to a proportionate share of the output from those facilities. The subsidiaries are responsible for their share of the operating costs, as well as providing their own financing. Accordingly, each subsidiary's proportionate share of the facilities and related revenues and expenses is included in the appropriate balance sheet and statement of income captions. NEE's and FPL's respective shares of direct expenses for these facilities are included in fuel, purchased power and interchange expense, O&M expenses, depreciation and amortization expense and taxes other than income taxes and other - net in NEE's and FPL's consolidated statements of income. NEE's and FPL's proportionate ownership interest in jointly-owned facilities is as follows:
| December 31, 2020
| Ownership Interest |  | Gross Investment(a) |  | Accumulated Depreciation(a) |  | Construction Work in Progress
|  |  | (millions)
FPL: |  |  |  |  |  |  |
St. Lucie Unit No. 2 | 85 | % |  | $ | 2,260 |  |  | $ | 999 |  |  | $ | 47 |
Scherer Unit No. 4(b) | 76 | % |  | $ | 1,300 |  |  | $ | 502 |  |  | $ | 2 |
Gulf Power: |  |  |  |  |  |  |
Daniel Units Nos. 1 and 2 | 50 | % |  | $ | 718 |  |  | $ | 241 |  |  | $ | 39 |
Scherer Unit No. 3 | 25 | % |  | $ | 445 |  |  | $ | 168 |  |  | $ | 2 |
NEER:(c) |  |  |  |  |  |  |
Seabrook | 88.23 | % |  | $ | 1,290 |  |  | $ | 412 |  |  | $ | 53 |
Wyman Station Unit No. 4 | 91.19 | % |  | $ | 30 |  |  | $ | 9 |  |  | $ | 1 |
Stanton | 65 | % |  | $ | 138 |  |  | $ | 13 |  |  | $ | — |
Transmission substation assets located in Seabrook, New Hampshire | 88.23 | % |  | $ | 114 |  |  | $ | 9 |  |  | $ | 11 |
______________________ (a)Excludes nuclear fuel. (b)Together with its joint interest owner, and subject to certain approvals from the FPSC, FPL intends to retire this unit in early 2022. (c)NEER also owns an approximately 70% interest in Duane Arnold, a nuclear facility that ceased operations in August 2020.

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- Definition Jointly-Owned Electric Plants [Abstract] + References No definition available. + Details
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- Definition The entire disclosure for public utilities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -URI http://asc.fasb.org/topic&trid=2156578 + Details
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