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Debt (Schedule of Debt Instruments) (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Debt Instrument [Line Items] |  |
Less current maturities of long-term debt | $ 4,138 | $ 2,124
Long-term debt, excluding current maturities | 41,944 | 37,543
Repayment prior to maturity | 4,138 |
FPL[Member] |  |
Debt Instrument [Line Items] |  |
Unamortized debt issuance costs and discount | (168) | (156)
Total long-term debt | 15,676 | 14,161
Less current maturities of long-term debt | 54 | 30
Long-term debt, excluding current maturities | 15,622 | 14,131
Repayment prior to maturity | 54 |
FPL[Member] | First mortgage bonds - fixed [Member] |  |
Debt Instrument [Line Items] |  |
Long-term debt, gross | $ 13,090 | $ 12,005
Weighted-average interest rate | 4.32% | 4.46%
FPL[Member] | Pollution control, solid waste disposal and industrial development revenue bonds - primary variable [Member] |  |
Debt Instrument [Line Items] |  |
Long-term debt, gross | $ 948 | $ 1,076
Weighted-average interest rate | 0.12% | 1.67%
Variable rate tax exempt bonds | $ 948 |
FPL[Member] | Senior Unsecured Notes - Variable [Member] |  |
Debt Instrument [Line Items] |  |
Long-term debt, gross | $ 1,806 | $ 1,236
Weighted-average interest rate | 0.44% | 2.18%
Floating rate notes that permit individual noteholders to require repayment prior to maturity | $ 556 |
Gulf Power [Member] |  |
Debt Instrument [Line Items] |  |
Unamortized debt issuance costs and discount | (14) | $ (14)
Total long-term debt | 1,560 | 1,685
Less current maturities of long-term debt | 300 | 175
Long-term debt, excluding current maturities | 1,260 | 1,510
Gulf Power [Member] | Other Long-Term Debt - Primarily Variable [Member] |  |
Debt Instrument [Line Items] |  |
Long-term debt, gross | $ 759 | $ 709
Weighted-average interest rate | 0.70% | 1.93%
Variable rate tax exempt bonds | $ 426 |
Gulf Power [Member] | Senior unsecured notes -fixed [Member] |  |
Debt Instrument [Line Items] |  |
Long-term debt, gross | $ 815 | $ 990
Weighted-average interest rate | 4.05% | 4.17%
NEER [Member] |  |
Debt Instrument [Line Items] |  |
Unamortized debt issuance costs and premium | $ (65) | $ (74)
Total long-term debt | 4,647 | 4,622
Less current maturities of long-term debt | 239 | 215
Long-term debt, excluding current maturities | 4,408 | 4,407
NEER [Member] | Other Long-Term Debt - Primarily Variable [Member] |  |
Debt Instrument [Line Items] |  |
Long-term debt, gross | $ 450 | $ 440
Weighted-average interest rate | 2.72% | 3.78%
NEER [Member] | Other long-term debt - fixed [Member] | NEET [Member] |  |
Debt Instrument [Line Items] |  |
Long-term debt, gross | $ 937 | $ 837
Weighted-average interest rate | 3.09% | 3.50%
NEER [Member] | Senior secured limited-recourse term loans - primarily variable [Member] |  |
Debt Instrument [Line Items] |  |
Long-term debt, gross | $ 3,325 | $ 3,419
Weighted-average interest rate | 2.33% | 3.79%
Capital Holdings [Member] |  |
Debt Instrument [Line Items] |  |
Unamortized debt issuance costs, premium and discount | $ (115) | $ (139)
Total long-term debt | 24,199 | 19,199
Less current maturities of long-term debt | 3,545 | 1,704
Long-term debt, excluding current maturities | 20,654 | 17,495
Capital Holdings [Member] | Other long-term debt - variable [Member] |  |
Debt Instrument [Line Items] |  |
Long-term debt, gross | $ 600 | $ 750
Weighted-average interest rate | 0.70% | 2.60%
Capital Holdings [Member] | Other long-term debt - fixed [Member] |  |
Debt Instrument [Line Items] |  |
Long-term debt, gross | $ 221 | $ 524
Weighted-average interest rate | 0.92% | 2.00%
Capital Holdings [Member] | Debentures - fixed [Member] |  |
Debt Instrument [Line Items] |  |
Long-term debt, gross | $ 11,540 | $ 9,550
Weighted-average interest rate | 2.86% | 3.05%
Capital Holdings [Member] | Debentures variable [Domain] |  |
Debt Instrument [Line Items] |  |
Long-term debt, gross | $ 1,225 | $ 1,375
Weighted-average interest rate | 0.80% | 3.00%
Capital Holdings [Member] | Debentures, related to NEE's equity units - fixed [Member] |  |
Debt Instrument [Line Items] |  |
Long-term debt, gross | $ 6,000 | $ 1,500
Weighted-average interest rate | 1.46% | 2.10%
Capital Holdings [Member] | Junior subordinated debentures - primarily fixed [Member] |  |
Debt Instrument [Line Items] |  |
Long-term debt, gross | $ 3,693 | $ 4,643
Weighted-average interest rate | 4.78% | 5.13%
Capital Holdings [Member] | Japanese yen denominated term loans - variable [Member] |  |
Debt Instrument [Line Items] |  |
Long-term debt, gross | $ 650 | $ 645
Weighted-average interest rate | 1.49% | 3.10%
Capital Holdings [Member] | Australian dollar denominated long-term debt - fixed [Member] |  |
Debt Instrument [Line Items] |  |
Long-term debt, gross | $ 385 | $ 351
Weighted-average interest rate | 2.20% | 2.59%
Other Current Liabilities [Member] |  |
Debt Instrument [Line Items] |  |
Current other liabilities |  | $ 133
Other Current Liabilities [Member] | NEER [Member] | Other Long Term Debt [Member] |  |
Debt Instrument [Line Items] |  |
Current other liabilities | $ 463 |

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