Fair Value Measurements (Fair Value of Instruments Recorded at Carrying Amount) (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2014		Dec. 31, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Held To Maturity Notes Receivable Maturity Date High	2029
Special Use Funds Storm Fund Assets	$ 75
Special use funds: nuclear decommissioning fund assets	4,955
Available for sale debt securities amortized cost	1,923		1,954
Available For Sale Securities Equity Securities Amortized Cost	1,499		1,384
Special Use Funds Nuclear Decommissioning Funds Weighted Average Maturity	7 years
Special Use Funds Storm Fund Weighted Average Maturity	3 years
Estimated Fair Value [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Special Use Funds Recorded at Carrying Amount Fair Value Disclosure	386	[1]	311	[1]
Other Investments Notes Receivable Fair Value Disclosure	682	[2]	627	[2]
Long Term Debt Including Current Maturities Fair Value Disclosure	30,080	[3]	28,612	[3]
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	19,515		17,921
Carrying Amount [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Special Use Funds Recorded at Carrying Amount Fair Value Disclosure	386	[1]	311	[1]
Other Investments Notes Receivable Fair Value Disclosure	520		531
Long Term Debt Including Current Maturities Fair Value Disclosure	28,231		27,728
FPL [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Special use funds: nuclear decommissioning fund assets	3,359
Available for sale debt securities amortized cost	1,528		1,595
Available For Sale Securities Equity Securities Amortized Cost	787		694
Special Use Funds Nuclear Decommissioning Funds Weighted Average Maturity	7 years
FPL [Member] | Estimated Fair Value [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Special Use Funds Recorded at Carrying Amount Fair Value Disclosure	247	[1]	200	[1]
Long Term Debt Including Current Maturities Fair Value Disclosure	10,763	[3]	9,451	[3]
FPL [Member] | Carrying Amount [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Special Use Funds Recorded at Carrying Amount Fair Value Disclosure	247	[1]	200	[1]
Long Term Debt Including Current Maturities Fair Value Disclosure	$ 9,471		$ 8,829

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

[2] 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 September 30, 2014 and December 31, 2013, NEE had no notes receivable reported in non-accrual status.

[3] As of September 30, 2014 and December 31, 2013, for NEE, $19,515 million and $17,921 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).