Derivative Instruments (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012		Sep. 30, 2012		Dec. 31, 2011
Net fair values of mark-to-market derivative instrument assets (liabilities) [Abstract]
Current derivative assets	$ 482	[1]	$ 482	[1]	$ 611	[1]
Noncurrent derivative assets	944	[2]	944	[2]	973	[2]
Current derivative liabilities	(486)	[3]	(486)	[3]	(1,090)	[3]
Noncurrent derivative liabilities	(530)	[4]	(530)	[4]	(541)	[4]
Total mark-to-market derivative instrument assets (liabilities)	410		410		(47)
Summary of derivative instruments by risk exposure, maximum maturity [Abstract]
Maximum length of time hedged in commodity cash flow hedges			through December 2012
Maximum length of time hedged in interest rate cash flow hedges			through December 2030
Maximum Length of Time Hedged in Foreign Currency Cash Flow Hedge			through September 2030
Margin cash collateral received from counterparties - netted against current derivative assets	40		40		106
Margin cash collateral received from counterparties - netted against noncurrent derivative assets	154		154		109
Margin cash collateral provided to counterparties - netted against current derivative liabilities	74		74		112
Margin cash collateral provided to counterparties - netted against noncurrent derivative liabilities					79
Margin cash collateral received from counterparties that was not offset against derivative assets	44		44		22
Margin cash collateral provided to counterparties that was not offset against derivative liabilities	54		54		50
Total gain (loss) to be reclassified during next 12 months	(39)
FPL [Member]
Net fair values of mark-to-market derivative instrument assets (liabilities) [Abstract]
Current derivative assets	8	[1],[5]	8	[1],[5]	10	[1],[5]
Noncurrent derivative assets	32	[2],[6]	32	[2],[6]	2	[2],[6]
Current derivative liabilities	(67)	[3]	(67)	[3]	(512)	[3]
Noncurrent derivative liabilities	0	[4],[7]	0	[4],[7]	(1)	[4],[7]
Total mark-to-market derivative instrument assets (liabilities)	$ (27)		$ (27)		$ (501)

[1] At September 30, 2012 and December 31, 2011, NEE's balances reflect the netting of approximately $40 million and $106 million (none at FPL), respectively, in margin cash collateral received from counterparties.

[2] At September 30, 2012 and December 31, 2011, NEE's balances reflect the netting of approximately $154 million and $109 million (none at FPL), respectively, in margin cash collateral received from counterparties.

[3] At September 30, 2012 and December 31, 2011, NEE's balances reflect the netting of approximately $74 million and $112 million (none at FPL), respectively, in margin cash collateral provided to counterparties.

[4] At December 31, 2011, NEE's balance reflects the netting of approximately $79 million (none at FPL) in margin cash collateral provided to counterparties.

[5] Included in current other assets on FPL's condensed consolidated balance sheets.

[6] Included in noncurrent other assets on FPL's condensed consolidated balance sheets.

[7] Included in noncurrent other liabilities on FPL's condensed consolidated balance sheets.