Consolidated Statements of Capitalization (Parenthetical) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Total long-term debt (annual interest requirement — $)	$ 1,600
Annual dividend requirement	$ 39
Common stock, par value per share (in dollars per share)	$ 5	$ 5
Common stock, shares authorized	1,500,000,000	1,500,000,000
Common stock, shares issued	991,000,000	915,000,000
Treasury shares	800,000	3,400,000
Redeemable Preferred Stock, $1 par value [Member]
Preferred Stock, Par or Stated Value Per Share (in dollars per share)	$ 1	$ 1
Redeemable Cumulative preferred stock, shares authorized	28,000,000	28,000,000
Redeemable Cumulative preferred stock, shares outstanding	2,000,000	2,000,000
Redeemable Preferred Stock, $1 par value [Member] | Cumulative Preferred Stock [Member]
Dividend Rate, Minimum	5.83%	5.83%
Redeemable Preferred Stock, $100 par or stated value [Member]
Preferred Stock, Par or Stated Value Per Share (in dollars per share)	$ 100	$ 100
Redeemable Cumulative preferred stock, shares authorized	20,000,000	20,000,000
Redeemable Cumulative preferred stock, shares outstanding	1,000,000	1,000,000
Redeemable Preferred Stock, $100 par or stated value [Member] | Cumulative Preferred Stock [Member]
Dividend Rate, Minimum	4.20%	4.20%
Dividend Rate, Maximum	5.44%	5.44%
Redeemable Preferred Stock, $25 stated value
Preferred Stock, Par or Stated Value Per Share (in dollars per share)	$ 25	$ 25
Preference Stock , $100 par or stated value [Member]
Dividend Rate, Minimum	5.60%	5.60%
Dividend Rate, Maximum	6.50%	6.50%
Preferred Stock, Par or Stated Value Per Share (in dollars per share)	$ 100	$ 100
Preference stock, shares outstanding	4,000,000	4,000,000
Preference Stock, $1 par value [Member]
Dividend Rate, Minimum	6.45%	6.45%
Dividend Rate, Maximum	6.50%	6.50%
Preferred Stock, Par or Stated Value Per Share (in dollars per share)	$ 1	$ 1
Preference stock, shares authorized	65,000,000	65,000,000
Preference stock, shares outstanding	8,000,000	8,000,000
Redeemable Preferred Stock [Member]
Annual dividend requirement	$ 6	$ 6
Noncumulative Preferred Stock [Member]
Dividend Rate, Minimum	6.00%	6.00%
Dividend Rate, Maximum	6.13%	6.13%
Preferred Stock, Par or Stated Value Per Share (in dollars per share)	$ 25	$ 25
Preference stock, shares authorized	60,000,000	60,000,000
Preference stock, shares outstanding	2,000,000	2,000,000
Maturity of Pollution Control Revenue Bonds 2019 [Member]
Fixed stated interest rate of debt obligation	4.55%	4.55%
Pollution Control Revenue Bonds Due 2016 [Member]
Fixed stated interest rate of debt obligation		0.22%
Pollution Control Revenue Bonds Due 2021 [Member]
Fixed stated interest rate of debt obligation	7.13%	7.13%
Maturity Of First Mortgage Bonds Due 2019 [Member]
Fixed stated interest rate of debt obligation	4.70%
Maturity Of Gas Facility Revenue Bonds Due 2022 to 2033 [Member]
Fixed stated interest rate of debt obligation	1.28%
Affiliate trusts, variable rate, due 2042 [Member]
Fixed stated interest rate of debt obligation	3.95%	3.95%
Adjustable Rate Loans [Member] | Maturity of Long Term Senior Notes and Debt After Year Five [Member]
Fixed stated interest rate of debt obligation	3.75%	3.75%
Alabama Power [Member]
Total long-term debt (annual interest requirement — $)	$ 290
Annual dividend requirement	$ 13
Common stock, par value per share (in dollars per share)	$ 40	$ 40
Common stock, shares authorized	40,000,000	40,000,000
Common stock, shares outstanding	30,537,500	30,537,500
Alabama Power [Member] | Redeemable Preferred Stock, $1 par value [Member]
Dividend Rate, Minimum	5.83%	5.83%
Preferred Stock, Par or Stated Value Per Share (in dollars per share)	$ 1	$ 1
Redeemable Cumulative preferred stock, shares authorized	27,500,000	27,500,000
Redeemable Cumulative preferred stock, shares outstanding	1,520,000	1,520,000
Alabama Power [Member] | Redeemable Preferred Stock, $100 par or stated value [Member]
Preferred Stock, Par or Stated Value Per Share (in dollars per share)	$ 100	$ 100
Redeemable Cumulative preferred stock, shares authorized	3,850,000	3,850,000
Redeemable Cumulative preferred stock, shares outstanding	475,115	475,115
Alabama Power [Member] | Redeemable Preferred Stock, $100 par or stated value [Member] | Cumulative Preferred Stock [Member]
Dividend Rate, Minimum	4.20%	4.20%
Dividend Rate, Maximum	4.92%	4.92%
Alabama Power [Member] | Redeemable Preferred Stock, $25 stated value
Preferred Stock, Par or Stated Value Per Share (in dollars per share)	$ 25	$ 25
Alabama Power [Member] | Preference Stock, $1 par value [Member]
Dividend Rate, Minimum	6.45%	6.45%
Dividend Rate, Maximum	6.50%	6.50%
Preferred Stock, Par or Stated Value Per Share (in dollars per share)	$ 1	$ 1
Alabama Power [Member] | Redeemable Preferred Stock [Member]
Annual dividend requirement	$ 4
Alabama Power [Member] | Noncumulative Preferred Stock [Member]
Preferred Stock, Par or Stated Value Per Share (in dollars per share)	$ 25	$ 25
Preference stock, shares authorized	40,000,000	40,000,000
Preference stock, shares outstanding	8,000,000	8,000,000
Alabama Power [Member] | Affiliate trusts, variable rate, due 2042 [Member]
Fixed stated interest rate of debt obligation	3.95%	3.95%
Alabama Power [Member] | Maturity of Long Term Senior Notes and Debt In Last Twelve Months [Member]
Fixed stated interest rate of debt obligation		5.20%
Alabama Power [Member] | Maturity of Long Term Senior Notes and Debt in Year Three [Member]
Fixed stated interest rate of debt obligation	5.125%	5.125%
Alabama Power [Member] | Maturity of Long Term Senior Notes and Debt in Year Four [Member]
Fixed stated interest rate of debt obligation	3.375%	3.375%
Georgia Power [Member]
Total long-term debt (annual interest requirement — $)	$ 402
Annual dividend requirement	$ 17
Common stock, shares authorized	20,000,000	20,000,000
Common stock, shares outstanding	9,261,500	9,261,500
Georgia Power [Member] | Noncumulative Preferred Stock, $25 par value [Member]
Preferred Stock, Par or Stated Value Per Share (in dollars per share)	$ 25	$ 25
Dividend Rate	6.125%	6.125%
Preference stock, shares authorized	50,000,000	50,000,000
Preference stock, shares outstanding	1,800,000	1,800,000
Georgia Power [Member] | Noncumulative Preferred Stock, $100 par value [Member]
Preferred Stock, Par or Stated Value Per Share (in dollars per share)	$ 100	$ 100
Dividend Rate	6.50%	6.50%
Preference stock, shares authorized	15,000,000	15,000,000
Preference stock, shares outstanding	2,250,000	2,250,000
Georgia Power [Member] | Pollution control revenue bonds variable rate, Due 2016 [Member]
Fixed stated interest rate of debt obligation		0.22%
Georgia Power [Member] | Maturity of Long Term Senior Notes and Debt In Last Twelve Months [Member]
Fixed stated interest rate of debt obligation		3.00%
Georgia Power [Member] | Maturity of Long Term Senior Notes and Debt In Next Twelve Months [Member]
Fixed stated interest rate of debt obligation	5.70%	5.70%
Georgia Power [Member] | Maturity of Long Term Senior Notes and Debt in Year Three [Member]
Fixed stated interest rate of debt obligation	4.25%	4.25%
Georgia Power [Member] | Maturity of Long Term Senior Notes and Debt in Year Five [Member]
Fixed stated interest rate of debt obligation	2.40%	2.40%
Gulf Power [Member]
Total long-term debt (annual interest requirement — $)	$ 42
Annual dividend requirement	$ 9
Common stock, shares authorized	20,000,000	20,000,000
Preference stock, shares authorized	20,000,000	20,000,000
Common stock, shares outstanding	5,642,717	5,642,717
Gulf Power [Member] | Preference Stock , $100 par or stated value [Member]
Preferred Stock, Par or Stated Value Per Share (in dollars per share)	$ 100	$ 100
Preference stock, shares outstanding	550,000	550,000
Gulf Power [Member] | Preference Stock Type Three [Member]
Preference stock, shares outstanding	450,000	450,000
Gulf Power [Member] | Preference Stock Type Four [Member]
Preference stock, shares outstanding	500,000	500,000
Gulf Power [Member] | Preference Stock, $1 par value [Member]
Preference stock, shares authorized	10,000,000	10,000,000
Gulf Power [Member] | Maturity of Long Term Senior Notes and Debt In Last Twelve Months [Member]
Fixed stated interest rate of debt obligation		5.30%
Gulf Power [Member] | Maturity of Long Term Senior Notes and Debt in Year Four [Member]
Fixed stated interest rate of debt obligation	4.75%	4.75%
Gulf Power [Member] | 6.0% preference stock [Member] | Preference Stock , $100 par or stated value [Member]
Fixed stated interest rate of debt obligation	6.00%	6.00%
Gulf Power [Member] | 6.45% preference stock [Member] | Preference Stock , $100 par or stated value [Member]
Fixed stated interest rate of debt obligation	6.45%	6.45%
Gulf Power [Member] | Five Point Six Percent Preference Stock [Member] | Preference Stock , $100 par or stated value [Member]
Fixed stated interest rate of debt obligation	5.60%	5.60%
Mississippi Power [Member]
Total long-term debt (annual interest requirement — $)	$ 102
Dividend Rate, Minimum	4.40%	4.40%
Dividend Rate, Maximum	5.25%	5.25%
Preferred Stock, Par or Stated Value Per Share (in dollars per share)	$ 100	$ 100
Redeemable Cumulative preferred stock, shares authorized	1,244,139	1,244,139
Redeemable Cumulative preferred stock, shares outstanding	334,210	334,210
Annual dividend requirement	$ 2
Common stock, shares authorized	1,130,000	1,130,000
Common stock, shares outstanding	1,121,000	1,121,000
Mississippi Power [Member] | 2028 [Member]
Fixed stated interest rate of debt obligation	5.15%	5.15%
Mississippi Power [Member] | Plant Daniel revenue bonds due 2021 [Member]
Fixed stated interest rate of debt obligation	7.13%	7.13%
Mississippi Power [Member] | Maturity of Long Term Senior Notes and Debt In Last Twelve Months [Member]
Fixed stated interest rate of debt obligation		2.35%
Mississippi Power [Member] | Maturity of Long Term Senior Notes and Debt In Next Twelve Months [Member]
Fixed stated interest rate of debt obligation	5.60%	5.60%
Mississippi Power [Member] | Maturity of Long Term Senior Notes and Debt in Year Three [Member]
Fixed stated interest rate of debt obligation	5.55%	5.55%
Mississippi Power [Member] | Maturity of Long-Term Debt Payable to Parent Company [Member]
Fixed stated interest rate of debt obligation	2.27%	2.27%
Minimum [Member] | Maturity of Pollution Control Revenue Bonds 2022 through 2049 [Member]
Fixed stated interest rate of debt obligation	0.65%	0.65%
Minimum [Member] | Pollution Control Revenue Bonds Due 2017 [Member]
Fixed stated interest rate of debt obligation	0.77%	0.77%
Minimum [Member] | Pollution Control Revenue Bonds Due 2022 to 2053 [Member]
Fixed stated interest rate of debt obligation	0.75%	0.75%
Minimum [Member] | Pollution Control Revenue Bonds Due 2021 [Member]
Fixed stated interest rate of debt obligation	0.82%	0.82%
Minimum [Member] | FFB Loans Due 2022 to 2044 [Member]
Fixed stated interest rate of debt obligation	2.57%	2.57%
Minimum [Member] | First Mortgage Bonds Due 2023 to 2033 [Member]
Fixed stated interest rate of debt obligation	2.66%
Minimum [Member] | Junior Subordinated Notes Due 2076 [Member]
Fixed stated interest rate of debt obligation	5.25%	5.25%
Minimum [Member] | Maturity of Long Term Senior Notes and Debt After Year Five [Member]
Fixed stated interest rate of debt obligation	1.00%	1.00%
Minimum [Member] | Maturity of Long Term Senior Notes and Debt In Last Twelve Months [Member]
Fixed stated interest rate of debt obligation		1.95%
Minimum [Member] | Maturity of Long Term Senior Notes and Debt In Next Twelve Months [Member]
Fixed stated interest rate of debt obligation	1.30%	1.30%
Minimum [Member] | Maturity of Long Term Senior Notes and Debt in Year Two [Member]
Fixed stated interest rate of debt obligation	1.50%	1.50%
Minimum [Member] | Maturity of Long Term Senior Notes and Debt in Year Three [Member]
Fixed stated interest rate of debt obligation	1.85%	1.85%
Minimum [Member] | Maturity of Long Term Senior Notes and Debt in Year Four [Member]
Fixed stated interest rate of debt obligation	2.38%	2.38%
Minimum [Member] | Maturity of Long Term Senior Notes and Debt in Year Five [Member]
Fixed stated interest rate of debt obligation	2.35%	2.35%
Minimum [Member] | Maturity Of FFB Loans Due 2020 [Member]
Fixed stated interest rate of debt obligation	2.57%	2.57%
Minimum [Member] | Maturity Of FFB Loans Due 2021 [Member]
Fixed stated interest rate of debt obligation	2.57%	2.57%
Minimum [Member] | Adjustable Rate Loans [Member] | Maturity of Long Term Senior Notes and Debt In Last Twelve Months [Member]
Fixed stated interest rate of debt obligation		0.76%
Minimum [Member] | Adjustable Rate Loans [Member] | Maturity of Long Term Senior Notes and Debt In Next Twelve Months [Member]
Fixed stated interest rate of debt obligation	1.82%	1.82%
Minimum [Member] | Adjustable Rate Loans [Member] | Maturity of Long Term Senior Notes and Debt in Year Two [Member]
Fixed stated interest rate of debt obligation	1.88%
Minimum [Member] | Adjustable Rate Loans [Member] | Maturity of Long Term Senior Notes and Debt in Year Five [Member]
Fixed stated interest rate of debt obligation	1.87%
Minimum [Member] | Alabama Power [Member] | Maturity of Long Term Senior Notes and Debt Two Thousand Twenty Two to Two Thousand Forty Six [Member]
Fixed stated interest rate of debt obligation	2.80%	2.80%
Minimum [Member] | Alabama Power [Member] | Maturity of Long Term Senior Notes And Debt Two Thousand Seventeen [Member]
Fixed stated interest rate of debt obligation	5.50%	5.50%
Minimum [Member] | Alabama Power [Member] | Pollution control revenue bonds due 2034 [Member]
Fixed stated interest rate of debt obligation	0.65%	0.65%
Minimum [Member] | Alabama Power [Member] | Pollution control revenue bonds due 2024-2038 [Member]
Fixed stated interest rate of debt obligation	0.77%	0.77%
Minimum [Member] | Alabama Power [Member] | Maturity Of Pollution Control Bonds Two Thousand Seventeen [Member]
Fixed stated interest rate of debt obligation	0.77%	0.77%
Minimum [Member] | Alabama Power [Member] | Maturity Of Pollution Control Bonds Two Thousand Twenty One [Member]
Fixed stated interest rate of debt obligation	0.82%	0.82%
Minimum [Member] | Alabama Power [Member] | Maturity of Long Term Senior Notes and Debt in Year Five [Member]
Fixed stated interest rate of debt obligation	3.95%	3.95%
Minimum [Member] | Alabama Power [Member] | Adjustable Rate Loans [Member] | Maturity of Long Term Senior Notes and Debt in Year Five [Member]
Fixed stated interest rate of debt obligation	1.87%	1.87%
Minimum [Member] | Georgia Power [Member] | FFB Loans Due 2022 to 2044 [Member]
Fixed stated interest rate of debt obligation	2.57%	2.57%
Minimum [Member] | Georgia Power [Member] | Maturity of Long Term Senior Notes and Debt Two Thousand Twenty Two to Two Thousand Forty Three [Member]
Fixed stated interest rate of debt obligation	2.85%	2.85%
Minimum [Member] | Georgia Power [Member] | Maturity of Long Term Notes Payable Variable Rate Due Two Thousand Sixteen [Member]
Fixed stated interest rate of debt obligation		0.76%
Minimum [Member] | Georgia Power [Member] | Pollution control revenue bonds due 2022 - 2049 [Member]
Fixed stated interest rate of debt obligation	1.38%	1.38%
Minimum [Member] | Georgia Power [Member] | Maturity of Long Term Senior Notes and Debt in Year Two [Member]
Fixed stated interest rate of debt obligation	1.95%	1.95%
Minimum [Member] | Georgia Power [Member] | Variable rate, Due 2022-2053 [Member]
Fixed stated interest rate of debt obligation	0.77%	0.77%
Minimum [Member] | Georgia Power [Member] | Maturity Of FFB Loans Due 2020 [Member]
Fixed stated interest rate of debt obligation	2.57%	2.57%
Minimum [Member] | Georgia Power [Member] | Maturity Of FFB Loans Due 2021 [Member]
Fixed stated interest rate of debt obligation	2.57%	2.57%
Minimum [Member] | Gulf Power [Member] | 2020-2051 [Member]
Fixed stated interest rate of debt obligation	3.10%	3.10%
Minimum [Member] | Gulf Power [Member] | Pollution control revenue bonds due 2022 - 2049 [Member]
Fixed stated interest rate of debt obligation	1.15%	1.15%
Minimum [Member] | Gulf Power [Member] | Pollution control revenue bonds due 2022-2042 [Member]
Fixed stated interest rate of debt obligation	0.75%	0.75%
Minimum [Member] | Gulf Power [Member] | Maturity of Long Term Senior Notes and Debt In Next Twelve Months [Member]
Fixed stated interest rate of debt obligation	2.93%	2.93%
Minimum [Member] | Mississippi Power [Member] | Maturity of Long Term Senior Notes and Debt Two Thousand Thirty Five Thousand Forty Two [Member]
Fixed stated interest rate of debt obligation	1.63%	1.63%
Minimum [Member] | Mississippi Power [Member] | Maturity of Long Term Notes Payable Variable Rate Due Two Thousand Sixteen [Member]
Fixed stated interest rate of debt obligation		1.84%
Minimum [Member] | Mississippi Power [Member] | Maturity of Long Term Notes Payable Variable Rate Due Two Thousand Eighteen [Member]
Fixed stated interest rate of debt obligation	2.15%	2.15%
Minimum [Member] | Mississippi Power [Member] | Maturity Of Pollution Control Bonds Two Thousand Seventeen [Member]
Fixed stated interest rate of debt obligation	0.83%	0.83%
Maximum [Member] | Maturity of Pollution Control Revenue Bonds 2022 through 2049 [Member]
Fixed stated interest rate of debt obligation	5.15%	5.15%
Maximum [Member] | Pollution Control Revenue Bonds Due 2017 [Member]
Fixed stated interest rate of debt obligation	0.87%	0.87%
Maximum [Member] | Pollution Control Revenue Bonds Due 2022 to 2053 [Member]
Fixed stated interest rate of debt obligation	0.87%	0.87%
Maximum [Member] | Pollution Control Revenue Bonds Due 2021 [Member]
Fixed stated interest rate of debt obligation	0.86%	0.86%
Maximum [Member] | FFB Loans Due 2022 to 2044 [Member]
Fixed stated interest rate of debt obligation	3.86%	3.86%
Maximum [Member] | First Mortgage Bonds Due 2023 to 2033 [Member]
Fixed stated interest rate of debt obligation	6.58%
Maximum [Member] | Junior Subordinated Notes Due 2076 [Member]
Fixed stated interest rate of debt obligation	6.25%	6.25%
Maximum [Member] | Maturity of Long Term Senior Notes and Debt After Year Five [Member]
Fixed stated interest rate of debt obligation	8.70%	8.70%
Maximum [Member] | Maturity of Long Term Senior Notes and Debt In Last Twelve Months [Member]
Fixed stated interest rate of debt obligation		5.30%
Maximum [Member] | Maturity of Long Term Senior Notes and Debt In Next Twelve Months [Member]
Fixed stated interest rate of debt obligation	7.20%	7.20%
Maximum [Member] | Maturity of Long Term Senior Notes and Debt in Year Two [Member]
Fixed stated interest rate of debt obligation	5.40%	5.40%
Maximum [Member] | Maturity of Long Term Senior Notes and Debt in Year Three [Member]
Fixed stated interest rate of debt obligation	5.55%	5.55%
Maximum [Member] | Maturity of Long Term Senior Notes and Debt in Year Four [Member]
Fixed stated interest rate of debt obligation	4.75%	4.75%
Maximum [Member] | Maturity of Long Term Senior Notes and Debt in Year Five [Member]
Fixed stated interest rate of debt obligation	9.10%	9.10%
Maximum [Member] | Maturity Of FFB Loans Due 2020 [Member]
Fixed stated interest rate of debt obligation	3.86%	3.86%
Maximum [Member] | Maturity Of FFB Loans Due 2021 [Member]
Fixed stated interest rate of debt obligation	3.86%	3.86%
Maximum [Member] | Adjustable Rate Loans [Member] | Maturity of Long Term Senior Notes and Debt In Last Twelve Months [Member]
Fixed stated interest rate of debt obligation		3.50%
Maximum [Member] | Adjustable Rate Loans [Member] | Maturity of Long Term Senior Notes and Debt In Next Twelve Months [Member]
Fixed stated interest rate of debt obligation	3.75%	3.75%
Maximum [Member] | Adjustable Rate Loans [Member] | Maturity of Long Term Senior Notes and Debt in Year Two [Member]
Fixed stated interest rate of debt obligation	2.24%
Maximum [Member] | Adjustable Rate Loans [Member] | Maturity of Long Term Senior Notes and Debt in Year Five [Member]
Fixed stated interest rate of debt obligation	2.10%
Maximum [Member] | Alabama Power [Member] | Maturity of Long Term Senior Notes and Debt Two Thousand Twenty Two to Two Thousand Forty Six [Member]
Fixed stated interest rate of debt obligation	6.125%	6.125%
Maximum [Member] | Alabama Power [Member] | Maturity of Long Term Senior Notes And Debt Two Thousand Seventeen [Member]
Fixed stated interest rate of debt obligation	5.55%	5.55%
Maximum [Member] | Alabama Power [Member] | Pollution control revenue bonds due 2034 [Member]
Fixed stated interest rate of debt obligation	1.65%	1.65%
Maximum [Member] | Alabama Power [Member] | Pollution control revenue bonds due 2024-2038 [Member]
Fixed stated interest rate of debt obligation	0.82%	0.82%
Maximum [Member] | Alabama Power [Member] | Maturity Of Pollution Control Bonds Two Thousand Seventeen [Member]
Fixed stated interest rate of debt obligation	0.79%	0.79%
Maximum [Member] | Alabama Power [Member] | Maturity Of Pollution Control Bonds Two Thousand Twenty One [Member]
Fixed stated interest rate of debt obligation	0.86%	0.86%
Maximum [Member] | Alabama Power [Member] | Maturity of Long Term Senior Notes and Debt in Year Five [Member]
Fixed stated interest rate of debt obligation	2.38%	2.38%
Maximum [Member] | Alabama Power [Member] | Adjustable Rate Loans [Member] | Maturity of Long Term Senior Notes and Debt in Year Five [Member]
Fixed stated interest rate of debt obligation	2.10%	2.10%
Maximum [Member] | Georgia Power [Member] | FFB Loans Due 2022 to 2044 [Member]
Fixed stated interest rate of debt obligation	3.86%	3.86%
Maximum [Member] | Georgia Power [Member] | Maturity of Long Term Senior Notes and Debt Two Thousand Twenty Two to Two Thousand Forty Three [Member]
Fixed stated interest rate of debt obligation	5.95%	5.95%
Maximum [Member] | Georgia Power [Member] | Maturity of Long Term Notes Payable Variable Rate Due Two Thousand Sixteen [Member]
Fixed stated interest rate of debt obligation		0.83%
Maximum [Member] | Georgia Power [Member] | Pollution control revenue bonds due 2022 - 2049 [Member]
Fixed stated interest rate of debt obligation	4.00%	4.00%
Maximum [Member] | Georgia Power [Member] | Maturity of Long Term Senior Notes and Debt in Year Two [Member]
Fixed stated interest rate of debt obligation	5.40%	5.40%
Maximum [Member] | Georgia Power [Member] | Variable rate, Due 2022-2053 [Member]
Fixed stated interest rate of debt obligation	0.87%	0.87%
Maximum [Member] | Georgia Power [Member] | Maturity Of FFB Loans Due 2020 [Member]
Fixed stated interest rate of debt obligation	3.86%	3.86%
Maximum [Member] | Georgia Power [Member] | Maturity Of FFB Loans Due 2021 [Member]
Fixed stated interest rate of debt obligation	3.86%	3.86%
Maximum [Member] | Gulf Power [Member] | 2020-2051 [Member]
Fixed stated interest rate of debt obligation	5.75%	5.75%
Maximum [Member] | Gulf Power [Member] | Pollution control revenue bonds due 2022 - 2049 [Member]
Fixed stated interest rate of debt obligation	4.45%	4.45%
Maximum [Member] | Gulf Power [Member] | Pollution control revenue bonds due 2022-2042 [Member]
Fixed stated interest rate of debt obligation	0.84%	0.84%
Maximum [Member] | Gulf Power [Member] | Maturity of Long Term Senior Notes and Debt In Next Twelve Months [Member]
Fixed stated interest rate of debt obligation	5.90%	5.90%
Maximum [Member] | Mississippi Power [Member] | Maturity of Long Term Senior Notes and Debt Two Thousand Thirty Five Thousand Forty Two [Member]
Fixed stated interest rate of debt obligation	5.40%	5.40%
Maximum [Member] | Mississippi Power [Member] | Maturity of Long Term Notes Payable Variable Rate Due Two Thousand Sixteen [Member]
Fixed stated interest rate of debt obligation		1.90%
Maximum [Member] | Mississippi Power [Member] | Maturity of Long Term Notes Payable Variable Rate Due Two Thousand Eighteen [Member]
Fixed stated interest rate of debt obligation	2.24%	2.24%
Maximum [Member] | Mississippi Power [Member] | Maturity Of Pollution Control Bonds Two Thousand Seventeen [Member]
Fixed stated interest rate of debt obligation	0.87%	0.87%