Financial Instruments (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other Investments Primarily Notes Receivable Fair Value Disclosure	$ 41		$ 35
Special use funds	4,190		3,867
Other investments [Abstract]
Special use funds: equity method investments	229		164
Special use funds: loans	40		39
Available for sale debt securities amortized cost	1,679		1,638
Available-for-sale Equity Securities, Amortized Cost Basis	1,500		1,425
Held to maturity notes receivable maturity date - high	2029
Special Use Funds Storm Fund Assets	73
Special use funds: nuclear decommissioning fund assets	4,117
Special use funds: nuclear decommissioning funds weighted average maturity (in years)	6 years
Special use funds: storm fund weighted average maturity (in years)	3 years
Carrying Amount [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Special use funds	4,190	[1]	3,867	[1]
Other investments [Abstract]
Notes receivable	500		503
Debt securities	111	[2]	89	[2]
Equity securities	61		80
Long-term debt, including current maturities	26,647	[3]	21,614
Interest rate swaps - net unrealized gains (losses)	(311)		(283)
Foreign currency swaps - net unrealized gains (losses)	(66)		18
Estimated Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Special use funds	4,190	[1]	3,867	[1]
Other investments [Abstract]
Notes receivable	665	[4]	535	[4]
Debt securities	111	[5]	89	[5]
Equity securities	79	[6]	159	[6]
Long-term debt, including current maturities	28,874	[7]	23,699	[7]
Interest rate swaps - net unrealized gains (losses)	(311)	[5]	(283)	[5]
Foreign currency swaps - net unrealized gains (losses)	(66)	[5]	18	[5]
Significant Other Observable Inputs (Level 2) [Member] | Estimated Fair Value [Member]
Other investments [Abstract]
Long-term debt, including current maturities	18,962		15,035
FPL [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other Investments Primarily Notes Receivable Fair Value Disclosure	4		4
Special use funds	2,918		2,737
Other investments [Abstract]
Special use funds: equity method investments	138		112
Special use funds: loans	32		24
Available for sale debt securities amortized cost	1,339		1,321
Available-for-sale Equity Securities, Amortized Cost Basis	839		864
Special use funds: nuclear decommissioning fund assets	2,845
Special use funds: nuclear decommissioning funds weighted average maturity (in years)	6 years
FPL [Member] | Carrying Amount [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Special use funds	2,918	[1]	2,737	[1]
Other investments [Abstract]
Long-term debt, including current maturities	8,782		7,533
FPL [Member] | Estimated Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Special use funds	2,918	[1]	2,737	[1]
Other investments [Abstract]
Long-term debt, including current maturities	$ 10,421	[7]	$ 9,078	[7]

[1] At December 31, 2012, includes $229 million of investments accounted for under the equity method and $40 million of loans not measured at fair value on a recurring basis ($138 million and $32 million, respectively, for FPL). At December 31, 2011, includes $164 million of investments accounted for under the equity method and $39 million of loans not measured at fair value on a recurring basis ($112 million and $24 million, respectively, for FPL). For the remaining balance, see Note 4 for classification by major security type and hierarchy level. The amortized cost of debt and equity securities is $1,679 million and $1,500 million, respectively, at December 31, 2012 and $1,638 million and $1,425 million, respectively, at December 31, 2011 ($1,339 million and $839 million, respectively, at December 31, 2012 and $1,321 million and $864 million, respectively, at December 31, 2011 for FPL).

[2] Classified as trading securities.

[3] 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 1 - Assets and Liabilities Associated with Assets Held for Sale.

[4] Classified as held to maturity. 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, 2012, NEE had no notes receivable reported in non-accrual status.

[5] See Note 4.

[6] Primarily modeled internally based on recent market information including, among other things, private offerings of the securities (Level 3).

[7] As of December 31, 2012 and 2011, $18,962 million and $15,035 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).