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Common and Preferred Stock (Tables)
 12 Months Ended
Dec. 31, 2011
Common and Preferred Stock [Abstract]  
Reconciliation of basic and diluted earnings per share of common stock
Earnings Per Share - The reconciliation of NEE's basic and diluted earnings per share of common stock is as follows:

 
Years Ended December 31,
 
2011
 
2010
 
2009
 
(millions, except per share amounts)
Numerator - net income
$
1,923

 
$
1,957

 
$
1,615

Denominator:
 

 
 

 
 

Weighted-average number of common shares outstanding - basic
416.6

 
410.3

 
404.4

Performance share awards, options, restricted stock, equity units and warrants(a)
2.4

 
2.7

 
2.8

Weighted-average number of common shares outstanding - assuming dilution
419.0

 
413.0

 
407.2

Earnings per share of common stock:
 
 
 

 
 

Basic
$
4.62

 
$
4.77

 
$
3.99

Assuming dilution
$
4.59

 
$
4.74

 
$
3.97

__________________________________
(a)
Performance share awards are included in diluted weighted-average number of common shares outstanding based upon what would be issued if the end of the reporting period was the end of the term of the award.  Options, performance share awards, restricted stock, equity units and warrants are included in diluted weighted-average number of common shares outstanding by applying the treasury stock method.
Restricted stock, performance share awards, and option activity
Option activity for the year ended December 31, 2011 was as follows:

 
Shares
Underlying
Options
 
Weighted-
Average
Exercise
Price
Per Share
 
Weighted-
Average
Remaining
Contractual
Term
(years)
 
Aggregate
Intrinsic
Value
(millions)
Balance, January 1, 2011
5,036,652

 
$
38.69

 
 
 
 
Granted
536,302

 
$
54.59

 
 
 
 
Exercised
(1,065,939
)
 
$
29.14

 
 
 
 
Forfeited
(102,451
)
 
$
50.49

 
 
 
 
Expired
(18,699
)
 
$
47.42

 
 
 
 
Balance, December 31, 2011
4,385,865

 
$
42.64

 
4.7

 
$
81

 
 
 
 
 
 
 
 
Exercisable, December 31, 2011
3,348,329

 
$
40.15

 
3.6

 
$
71

The activity in restricted stock and performance share awards for the year ended December 31, 2011 was as follows:

 
Shares
 
Weighted-
Average
Grant Date
Fair Value
Per Share
Restricted Stock:
 
 
 
Nonvested balance, January 1, 2011
1,154,590

 
$
50.40

Granted
452,488

 
$
54.77

Vested
(521,882
)
 
$
53.22

Forfeited
(52,908
)
 
$
51.34

Nonvested balance, December 31, 2011
1,032,288

 
$
50.84

Performance Share Awards:
 
 
 
Nonvested balance, January 1, 2011
1,318,398

 
$
45.96

Granted
566,386

 
$
50.13

Vested
(448,416
)
 
$
58.42

Forfeited
(85,294
)
 
$
43.34

Nonvested balance, December 31, 2011
1,351,074

 
$
43.72
Assumptions used to estimate fair value of options
The fair value of the options is estimated on the date of the grant using the Black-Scholes option-pricing model and based on the following assumptions:

 
2011
 
2010
 
2009
Expected volatility(a)
21.54%
 
20.74 - 21.64%
 
19.02 - 20.23%
Expected dividends
4.03%
 
3.61 - 4.39%
 
3.35 - 3.71%
Expected term (years)(b)
6
 
6
 
6
Risk-free rate
2.80%
 
1.65 - 2.91%
 
2.68 - 2.97%
__________________________________
(a)
Based on historical experience.
(b)
Based on historical exercise and post-vesting cancellation experience adjusted for outstanding awards.