Common Shareholders' Equity (Accumulated Other Comprehensive Income) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2014		Jun. 30, 2013		Jun. 30, 2014		Jun. 30, 2013
Components Of Comprehensive Income And Accumulated Other Comprehensive Income Loss [Line Items]
Beginning balance	$ 21		$ (136)		$ 56		$ (255)
Other comprehensive income (loss) before reclassifications	47		20		27		123
Amounts reclassified from AOCI	(9)		14		(24)		30
Net other comprehensive income (loss)	38		34		3		153
Ending balance	59		(102)		59		(102)
Net Unrealized Gains (Losses) on Available for Sale Securities
Components Of Comprehensive Income And Accumulated Other Comprehensive Income Loss [Line Items]
Beginning balance	185		130		197		96
Other comprehensive income (loss) before reclassifications	40		2		53		42
Amounts reclassified from AOCI	(5)	[1]	(4)	[1]	(30)	[1]	(10)	[1]
Net other comprehensive income (loss)	35		(2)		23		32
Ending balance	220		128		220		128
Net Unrealized Gains (Losses) on Cash Flow Hedges
Components Of Comprehensive Income And Accumulated Other Comprehensive Income Loss [Line Items]
Beginning balance	(124)		(180)		(115)		(266)
Other comprehensive income (loss) before reclassifications	(7)		36		(25)		101
Amounts reclassified from AOCI	(4)	[2]	18	[2]	5	[2]	39	[2]
Net other comprehensive income (loss)	(11)		54		(20)		140
Ending balance	(135)		(126)		(135)		(126)
Defined Benefit Pension and Other Benefits Plans
Components Of Comprehensive Income And Accumulated Other Comprehensive Income Loss [Line Items]
Beginning balance	28		(67)		23		(74)
Other comprehensive income (loss) before reclassifications	0		0		4		6
Amounts reclassified from AOCI	0		0		1		1
Net other comprehensive income (loss)	0		0		5		7
Ending balance	28		(67)		28		(67)
Net Unrealized Gains (Losses) on Foreign Currency Translation
Components Of Comprehensive Income And Accumulated Other Comprehensive Income Loss [Line Items]
Beginning balance	(50)		3		(33)		12
Other comprehensive income (loss) before reclassifications	17		(23)		0		(32)
Amounts reclassified from AOCI	0		0		0		0
Net other comprehensive income (loss)	17		(23)		0		(32)
Ending balance	(33)		(20)		(33)		(20)
Other Comprehensive Income (Loss) Related to Equity Method Investee
Components Of Comprehensive Income And Accumulated Other Comprehensive Income Loss [Line Items]
Beginning balance	(18)		(22)		(16)		(23)
Other comprehensive income (loss) before reclassifications	(3)		5		(5)		6
Amounts reclassified from AOCI	0		0		0		0
Net other comprehensive income (loss)	(3)		5		(5)		6
Ending balance	$ (21)		$ (17)		$ (21)		$ (17)

[1] Reclassified to gains on disposal of assets - net in NEE's condensed consolidated statements of income.

[2] Reclassified to interest expense and other - net in NEE's condensed consolidated statements of income. See Note 3 - Income Statement Impact of Derivative Instruments.