Derivative Instruments (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013		Dec. 31, 2012
Net fair values of mark-to-market derivative instrument assets (liabilities) [Abstract]
Current derivative assets	$ 486	[1]	$ 517	[1]
Noncurrent derivative assets	902	[2]	920	[2]
Current derivative liabilities	(419)	[3]	(430)	[3]
Noncurrent derivative liabilities	(391)	[4]	(587)	[4]
Total mark-to-market derivative instrument assets (liabilities)	578		420
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	33		43
Margin cash collateral received from counterparties - netted against noncurrent derivative assets	130		159
Margin cash collateral provided to counterparties - netted against current derivative liabilities	43		79
Margin cash collateral received from counterparties that was not offset against derivative assets	22		30
Margin cash collateral provided to counterparties that was not offset against derivative liabilities	39		49
Total gain (loss) to be reclassified during next 12 months	(45)
FPL [Member]
Net fair values of mark-to-market derivative instrument assets (liabilities) [Abstract]
Current derivative assets	136	[1],[5]	4	[1],[5]
Noncurrent derivative assets	9	[2],[6]	1	[2],[6]
Current derivative liabilities	(1)	[3],[4]	(20)	[3],[4]
Noncurrent derivative liabilities	0		0
Total mark-to-market derivative instrument assets (liabilities)	$ 144		$ (15)

[1] At March 31, 2013 and December 31, 2012, NEE's balances reflect the netting of approximately $33 million and $43 million (none at FPL), respectively, in margin cash collateral received from counterparties.

[2] At March 31, 2013 and December 31, 2012, NEE's balances reflect the netting of approximately $130 million and $159 million (none at FPL), respectively, in margin cash collateral received from counterparties.

[3] At March 31, 2013 and December 31, 2012, NEE's balances reflect the netting of approximately $43 million and $79 million (none at FPL), respectively, in margin cash collateral provided to counterparties.

[4] Included in current other liabilities on FPL's condensed consolidated balance sheets.

[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.