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Acquisitions (Details) $ in Millions | 1 Months Ended | 3 Months Ended | 6 Months Ended | 9 Months Ended
--- | --- | --- | --- | ---
May 31, 2018 facility agreement | Sep. 30, 2018 USD ($) county | Jun. 30, 2019 USD ($) | Sep. 30, 2018 county customer mi MW
Business Acquisition [Line Items] |  |  |  |
Number of business combination agreements | agreement | 3 |  |  |
Number of natural gas generation facilities | facility | 2 |  |  |
Scenario, Forecast [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Cash purchase price |  |  | $ 5,100 |
Gulf Power Company, Florida City Gas, And Natural Gas Generation Facilities [Member] | Scenario, Forecast [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Business combination, consideration transferred |  |  | 6,475 |
Cash purchase price |  |  | 5,100 |
Assumption of debt |  |  | $ 1,400 |
Oleader Power Project [Member] | Oleader Power Project [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Natural-gas fired, simple-cycle combustion turbine electric generation facility (in megawatts) | MW |  |  |  | 791
Stanton Energy Center [Member] | Scenario, Forecast [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Business acquisition, percentage of voting interests acquired |  |  | 65.00% |
Stanton Energy Center [Member] | Stanton Energy Center [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Combined-cycle electric generation facility (in megawatts) | MW |  |  |  | 660
Gulf Power [Member] | Scenario, Forecast [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Business combination, consideration transferred |  |  | $ 5,750 |
Cash purchase price |  |  | 4,350 |
Business combination, recognized identifiable assets acquired and liabilities assumed, noncurrent liabilities, long-term debt |  |  | 1,400 |
Gulf Power [Member] | Gulf Power [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Number of customers acquired | customer |  |  |  | 460,000
Number of counties in which entity operates | county |  | 8 |  | 8
Number of miles of power lines | mi |  |  |  | 9,500
Electric generating facility capacity (in megawatts) | MW |  |  |  | 2,300
FCG [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Cash purchase price |  | $ 530 |  |
FCG [Member] | FCG [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Number of customers acquired | customer |  |  |  | 110,000
Number of miles of natural gas pipeline | mi |  |  |  | 3,700
Natural Gas Generation Facilities [Member] | Scenario, Forecast [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Cash purchase price |  |  | $ 195 |

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