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Common Stock and Stock Compensation (Tables)
 12 Months Ended
Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Assumptions used in the pricing model and the weighted average grant-date fair value of stock options granted
The following table shows the assumptions used in the pricing model and the weighted average grant-date fair value of stock options granted:
 
Year Ended December 31
2013
 
2012
 
2011
Expected volatility
16.6%
 
17.7%
 
17.5%
Expected term (in years)
5.0
 
5.0
 
5.0
Interest rate
0.9%
 
0.9%
 
2.3%
Dividend yield
4.4%
 
4.2%
 
4.8%
Weighted average grant-date fair value
$2.93
 
$3.39
 
$3.23
Summary of stock option activity
Southern Company's activity in the stock option program for 2013 is summarized below:
 
Shares Subject to Option
 
Weighted Average Exercise Price
Outstanding at December 31, 2012
35,916,303

 
$
36.37

Granted
9,152,716

 
44.17

Exercised
(6,078,735
)
 
33.39

Cancelled
(170,918
)
 
43.30

Outstanding at December 31, 2013
38,819,366

 
$
38.64

Exercisable at December 31, 2013
24,150,442

 
$
35.70
Assumptions used in the pricing model and the weighted average grant-date fair value of performance share award units granted
The following table shows the assumptions used in the pricing model and the weighted average grant-date fair value of performance share award units granted:
Year Ended December 31
2013
 
2012
 
2011
Expected volatility
12.0%
 
16.0%
 
19.2%
Expected term (in years)
3.0
 
3.0
 
3.0
Interest rate
0.4%
 
0.4%
 
1.4%
Annualized dividend rate
$1.96
 
$1.89
 
$1.82
Weighted average grant-date fair value
$40.50
 
$41.99
 
$35.97
Earnings per share
Shares used to compute diluted earnings per share were as follows:
 
Average Common Stock Shares
 
2013
 
2012
 
2011
 
(in millions)
As reported shares
877

 
871

 
857

Effect of options and performance share award units
4

 
8

 
7

Diluted shares
881

 
879

 
864
Gulf Power [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Assumptions used in the pricing model and the weighted average grant-date fair value of stock options granted
The following table shows the assumptions used in the pricing model and the weighted average grant-date fair value of stock options granted:
Year Ended December 31
2013
 
2012
 
2011
Expected volatility
16.6%
 
17.7%
 
17.5%
Expected term (in years)
5.0
 
5.0
 
5.0
Interest rate
0.9%
 
0.9%
 
2.3%
Dividend yield
4.4%
 
4.2%
 
4.8%
Weighted average grant-date fair value
$2.93
 
$3.39
 
$3.23
Summary of stock option activity
The Company's activity in the stock option program for 2013 is summarized below:
 
Shares Subject
to Option
 
Weighted Average
Exercise Price
Outstanding at December 31, 2012
1,388,915

 
$
36.08

Granted
285,209

 
44.06

Exercised
(281,377
)
 
33.62

Cancelled
—

 
—

Outstanding at December 31, 2013
1,392,747

 
$
38.21

Exercisable at December 31, 2013
883,985

 
$
35.29
Assumptions used in the pricing model and the weighted average grant-date fair value of performance share award units granted
The following table shows the assumptions used in the pricing model and the weighted average grant-date fair value of performance share award units granted:
Year Ended December 31
2013
 
2012
 
2011
Expected volatility
12.0%
 
16.0%
 
19.2%
Expected term (in years)
3.0
 
3.0
 
3.0
Interest rate
0.4%
 
0.4%
 
1.4%
Annualized dividend rate
$1.96
 
$1.89
 
$1.82
Weighted average grant-date fair value
$40.50
 
$41.99
 
$35.97
Alabama Power [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Assumptions used in the pricing model and the weighted average grant-date fair value of stock options granted
The following table shows the assumptions used in the pricing model and the weighted average grant-date fair value of stock options granted:
Year Ended December 31
2013
 
2012
 
2011
Expected volatility
16.6%
 
17.7%
 
17.5%
Expected term (in years)
5.0
 
5.0
 
5.0
Interest rate
0.9%
 
0.9%
 
2.3%
Dividend yield
4.4%
 
4.2%
 
4.8%
Weighted average grant-date fair value
$2.93
 
$3.39
 
$3.23
Summary of stock option activity
The Company's activity in the stock option program for 2013 is summarized below:
 
Shares Subject to Option
 
Weighted Average Exercise Price
Outstanding at December 31, 2012
6,060,552

 
$
36.02

Granted
1,319,038

 
44.07

Exercised
(1,035,611
)
 
32.74

Cancelled
(4,271
)
 
42.88

Outstanding at December 31, 2013
6,339,708

 
$
38.23

Exercisable at December 31, 2013
4,021,541

 
$
35.29
Assumptions used in the pricing model and the weighted average grant-date fair value of performance share award units granted
The following table shows the assumptions used in the pricing model and the weighted average grant-date fair value of performance share award units granted:
Year Ended December 31
2013
 
2012
 
2011
Expected volatility
12.0%
 
16%
 
19.2%
Expected term (in years)
3.0
 
3.0
 
3.0
Interest rate
0.4%
 
0.4%
 
1.4%
Annualized dividend rate
$1.96
 
$1.89
 
$1.82
Weighted average grant-date fair value
$40.50
 
$41.99
 
$35.97
Georgia Power [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Assumptions used in the pricing model and the weighted average grant-date fair value of stock options granted
The following table shows the assumptions used in the pricing model and the weighted average grant-date fair value of stock options granted:
Year Ended December 31
2013
 
2012
 
2011
Expected volatility
16.6%
 
17.7%
 
17.5%
Expected term (in years)
5.0
 
5.0
 
5.0
Interest rate
0.9%
 
0.9%
 
2.3%
Dividend yield
4.4%
 
4.2%
 
4.8%
Weighted average grant-date fair value
$2.93
 
$3.39
 
$3.23
Summary of stock option activity
The Company's activity in the stock option program for 2013 is summarized below:
 
Shares Subject to Option
 
Weighted Average Exercise Price
Outstanding at December 31, 2012
6,547,498

 
$
36.18

Granted
1,509,662

 
44.09

Exercised
(1,196,585
)
 
33.38

Cancelled
(11,421
)
 
40.99

Outstanding at December 31, 2013
6,849,154

 
$
38.41

Exercisable at December 31, 2013
4,321,853

 
$
35.51
Assumptions used in the pricing model and the weighted average grant-date fair value of performance share award units granted
The following table shows the assumptions used in the pricing model and the weighted average grant-date fair value of performance share award units granted:
Year Ended December 31
2013
 
2012
 
2011
Expected volatility
12.0%
 
16.0%
 
19.2%
Expected term (in years)
3.0
 
3.0
 
3.0
Interest rate
0.4%
 
0.4%
 
1.4%
Annualized dividend rate
$1.96
 
$1.89
 
$1.82
Weighted average grant-date fair value
$40.50
 
$41.99
 
$35.97
Mississippi Power [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Assumptions used in the pricing model and the weighted average grant-date fair value of stock options granted
The following table shows the assumptions used in the pricing model and the weighted average grant-date fair value of stock options granted:
Year Ended December 31
2013
 
2012
 
2011
Expected volatility
16.6%
 
17.7%
 
17.5%
Expected term (in years)
5.0
 
5.0
 
5.0
Interest rate
0.9%
 
0.9%
 
2.3%
Dividend yield
4.4%
 
4.2%
 
4.8%
Weighted average grant-date fair value
$2.93
 
$3.39
 
$3.23
Summary of stock option activity
The Company's activity in the stock option program for 2013 is summarized below:
 
Shares Subject to Option
 
Weighted Average Exercise Price
Outstanding at December 31, 2012
1,373,566

 
$
36.34

Granted
345,830

 
44.03

Exercised
(379,933
)
 
33.59

Cancelled
(5,870
)
 
44.94

Outstanding at December 31, 2013
1,333,593

 
$
39.08

Exercisable at December 31, 2013
898,518

 
$
37.02
Assumptions used in the pricing model and the weighted average grant-date fair value of performance share award units granted
The following table shows the assumptions used in the pricing model and the weighted average grant-date fair value of performance share award units granted:
Year Ended December 31
2013
 
2012
 
2011
Expected volatility
12.0%
 
16.0%
 
19.2%
Expected term (in years)
3.0
 
3.0
 
3.0
Interest rate
0.4%
 
0.4%
 
1.4%
Annualized dividend rate
$1.96
 
$1.89
 
$1.82
Weighted average grant-date fair value
$40.50
 
$41.99
 
$35.97