Derivative Instruments (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2012		Dec. 31, 2011
Net fair values of mark-to-market derivative instrument assets (liabilities) [Abstract]
Current derivative assets	$ 632	[1]	$ 611	[1]
Noncurrent derivative assets	1,158	[2]	973	[2]
Current derivative liabilities	(882)	[3]	(1,090)	[3]
Noncurrent derivative liabilities	(633)	[4]	(541)	[4]
Total mark-to-market derivative instrument assets (liabilities)	275		(47)
Margin cash collateral received from counterparties - netted against current derivative assets	77		106
Margin cash collateral received from counterparties - netted against noncurrent derivative assets	181		109
Margin cash collateral provided to counterparties - netted against current derivative liabilities	82		112
Margin cash collateral provided to counterparties - netted against noncurrent derivative liabilities	29		79
Margin cash collateral received from counterparties that was not offset against derivative assets	24		22
Margin cash collateral provided to counterparties that was not offset against derivative liabilities	35		50
Total gain (loss) to be reclassified during next 12 months	(30)
FPL [Member]
Net fair values of mark-to-market derivative instrument assets (liabilities) [Abstract]
Current derivative assets	11	[1],[5]	10	[1],[5]
Noncurrent derivative assets	14	[2],[6]	2	[2],[6]
Current derivative liabilities	(327)	[3]	(512)	[3]
Noncurrent derivative liabilities	0	[4],[7]	(1)	[4],[7]
Total mark-to-market derivative instrument assets (liabilities)	$ (302)		$ (501)

[1] At June 30, 2012 and December 31, 2011, NEE's balances reflect the netting of approximately $77 million and $106 million (none at FPL), respectively, in margin cash collateral received from counterparties.

[2] At June 30, 2012 and December 31, 2011, NEE's balances reflect the netting of approximately $181 million and $109 million (none at FPL), respectively, in margin cash collateral received from counterparties.

[3] At June 30, 2012 and December 31, 2011, NEE's balances reflect the netting of approximately $82 million and $112 million (none at FPL), respectively, in margin cash collateral provided to counterparties.

[4] At June 30, 2012 and December 31, 2011, NEE's balances reflect the netting of approximately $29 million and $79 million (none at FPL), respectively, 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.