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Fair Value Measurements (Fair Value of Instruments Recorded at Other than Fair Value) (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Decommissioning Fund Investments, Fair Value | $ 6,003 | $ 5,434
Available for sale debt securities amortized cost | 1,921 | 1,820
Available-for-sale equity securities, amortized cost | $ 1,521 | 1,543
Special Use Funds Nuclear Decommissioning Funds Weighted Average Maturity | 9 years |
Reported Value Measurement [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Special Use Funds Fair Value Disclosure | $ 743 | 712
Other Investments Primarily Notes Receivable Fair Value Disclosure | 500 | 526
Long Term Debt Including Current Maturities Fair Value Disclosure | 33,134 | 30,418
Estimate of Fair Value Measurement [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Special Use Funds Fair Value Disclosure | 744 | 712
Other Investments Primarily Notes Receivable Fair Value Disclosure | 680 | 668
Long Term Debt Including Current Maturities Fair Value Disclosure | 35,447 | 31,623
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Long Term Debt Including Current Maturities Fair Value Disclosure | 33,743 | 29,804
liabilities associated with assets held-for-sale [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Long-term Debt | 373 | 373
FPL[Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Long-term Debt | 11,702 | 10,072
Special Use Funds Storm Fund Assets | 0 | 0
Decommissioning Fund Investments, Fair Value | 4,090 | 3,665
Available for sale debt securities amortized cost | 1,443 | 1,373
Available-for-sale equity securities, amortized cost | $ 783 | 764
Special Use Funds Nuclear Decommissioning Funds Weighted Average Maturity | 9 years |
FPL[Member] | Reported Value Measurement [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Special Use Funds Fair Value Disclosure | $ 593 | 557
Long Term Debt Including Current Maturities Fair Value Disclosure | 11,702 | 10,072
FPL[Member] | Estimate of Fair Value Measurement [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Special Use Funds Fair Value Disclosure | 593 | 557
Long Term Debt Including Current Maturities Fair Value Disclosure | $ 13,285 | $ 11,211

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- Definition This element represents the portion of the balance sheet assertion valued at fair value by the entity. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. Fair value of long-term debt including current maturities at the balance sheet date. + References No definition available. + Details
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- Definition This element represents the portion of the balance sheet assertion valued at fair value by the entity. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. An amount representing decommission fund to pay for the costs of decontaminating and decommissioning of facilities through collection of revenues derived from utility assessments and government appropriations. + References No definition available. + Details
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- Definition This item represents the weighted-average maturity of debt securities (in years) in nuclear decommissioning funds at the balance sheet date and which are categorized neither as held-to-maturity nor trading securities. + References No definition available. + Details
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- Definition The fair value of investments held in a trust fund to pay for the costs of decontaminating and decommissioning facilities, whether such amount is presented as a separate caption or as a parenthetical disclosure on the balance sheet. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + Details
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