Fair Value Measurements (Fair Value of Instruments Recorded at Carrying Amount) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale debt securities amortized cost	$ 1,954		$ 1,679
Available-for-sale Equity Securities, Amortized Cost Basis	1,384		1,500
Held To Maturity Notes Receivable Maturity Date High	2029
Special Use Funds Storm Fund Assets	74
Decommissioning Fund Investments, Fair Value	4,706
Special Use Funds Nuclear Decommissioning Funds Weighted Average Maturity	6 years
Special Use Funds Storm Fund Weighted Average Maturity	3 years
FPL [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale debt securities amortized cost	1,595		1,339
Available-for-sale Equity Securities, Amortized Cost Basis	694		839
Decommissioning Fund Investments, Fair Value	3,199
Special Use Funds Nuclear Decommissioning Funds Weighted Average Maturity	6 years
Carrying (Reported) Amount, Fair Value Disclosure [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Special Use Funds Fair Value Disclosure	311	[1]	269	[1]
Other Investments Primarily Notes Receivable Fair Value Disclosure	531		590
Long Term Debt Including Current Maturities Fair Value Disclosure	27,728		26,647	[2]
Carrying (Reported) Amount, Fair Value Disclosure [Member] | FPL [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Special Use Funds Fair Value Disclosure	200	[1]	170	[1]
Long Term Debt Including Current Maturities Fair Value Disclosure	8,829		8,782
Estimated Fair Value [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Special Use Funds Fair Value Disclosure	311	[1]	269	[1]
Other Investments Primarily Notes Receivable Fair Value Disclosure	627	[3]	774	[3]
Long Term Debt Including Current Maturities Fair Value Disclosure	28,612	[4]	28,874	[4]
Estimated Fair Value [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	17,921		18,962
Estimated Fair Value [Member] | FPL [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Special Use Funds Fair Value Disclosure	200	[1]	170	[1]
Long Term Debt Including Current Maturities Fair Value Disclosure	$ 9,451	[4]	$ 10,421	[4]

[1] Primarily represents investments accounted for under the equity method and loans not measured at fair value on a recurring basis.

[2] Also includes long-term debt reflected in liabilities associated with assets held for sale on the consolidated balance sheets, for which the carrying amount approximates fair value. See Note 6.

[3] Primarily classified as held to maturity. Fair values are primarily estimated using a discounted cash flow valuation technique based on certain observable yield curves and indices considering the credit profile of the borrower (Level 3). Notes receivable bear interest primarily at fixed rates and mature by 2029. Notes receivable are considered impaired and placed in non-accrual status when it becomes probable that all amounts due cannot be collected in accordance with the contractual terms of the agreement. The assessment to place notes receivable in non-accrual status considers various credit indicators, such as credit ratings and market-related information. As of December 31, 2013 and 2012, NEE had no notes receivable reported in non-accrual status.

[4] As of December 31, 2013 and 2012, for NEE, $17,921 million and $18,962 million, respectively, is estimated using quoted market prices for the same or similar issues (Level 2); the balance is estimated using a discounted cash flow valuation technique, considering the current credit spread of the debtor (Level 3). For FPL, estimated using quoted market prices for the same or similar issues (Level 2)