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v3.19.1

Revenue (Details) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2019 USD ($) Customers percent | Mar. 31, 2018 USD ($) | Mar. 31, 2019 USD ($) Customers percent | Mar. 31, 2018 USD ($)
State [Line Items] |  |  |  |
Revenue Capitalized During Pre-Commercial Operations | $ 0 | $ (10,000,000) | $ 0 | $ (11,000,000)
Electric revenue | (2,712,000,000) | (2,761,000,000) | (5,392,000,000) | (5,269,000,000)
Sales of Electricity | 2,712,000,000 | 2,753,000,000 | 5,393,000,000 | 5,262,000,000
Off System Sales of Electricity | 0 | 2,000,000 | 1,000,000 | 4,000,000
Other revenue | $ 38,000,000 | 39,000,000 | $ 82,000,000 | 79,000,000
Total number of customers | 154 |  | 154 |
Total long duration contract revenue recognition | 2,514,000,000 |  | 4,981,000,000 |
Total number of customers that represent a percent of sales | percent | 1 |  | 1 |
Revenues | $ 2,750,000,000 | 2,792,000,000 | $ 5,475,000,000 | 5,341,000,000
ALABAMA |  |  |  |
State [Line Items] |  |  |  |
Electric revenue | (387,000,000) | (406,000,000) | (779,000,000) | (767,000,000)
GEORGIA |  |  |  |
State [Line Items] |  |  |  |
Electric revenue | (70,000,000) | (73,000,000) | (137,000,000) | (136,000,000)
KENTUCKY |  |  |  |
State [Line Items] |  |  |  |
Electric revenue | (173,000,000) | (174,000,000) | (341,000,000) | (333,000,000)
MISSISSIPPI |  |  |  |
State [Line Items] |  |  |  |
Electric revenue | (249,000,000) | (252,000,000) | (501,000,000) | (489,000,000)
NORTH CAROLINA |  |  |  |
State [Line Items] |  |  |  |
Electric revenue | (21,000,000) | (20,000,000) | (41,000,000) | (36,000,000)
TENNESSEE |  |  |  |
State [Line Items] |  |  |  |
Electric revenue | (1,799,000,000) | (1,822,000,000) | (3,568,000,000) | (3,482,000,000)
VIRGINIA |  |  |  |
State [Line Items] |  |  |  |
Electric revenue | $ (13,000,000) | $ (14,000,000) | $ (25,000,000) | $ (26,000,000)
20-year Termination Notice [Member] |  |  |  |
State [Line Items] |  |  |  |
Number of customers | Customers | 3 |  | 3 |
Long-Duration Contracts Revenue Recognition, Policy [Policy Text Block] |  |  | 67 |
Number of customers that represent the percent of sales | percent | 0 |  | 0 |
Revenues | $ 34,000,000 |  |  |
15-year Termination Notice [Member] |  |  |  |
State [Line Items] |  |  |  |
Number of customers | Customers | 11 |  | 11 |
Long-Duration Contracts Revenue Recognition, Policy [Policy Text Block] |  |  | 251 |
Number of customers that represent the percent of sales | percent | 0 |  | 0 |
Revenues | $ 127,000,000 |  |  |
12-year Termination Notice [Member] |  |  |  |
State [Line Items] |  |  |  |
Number of customers | Customers | 1 |  | 1 |
Long-Duration Contracts Revenue Recognition, Policy [Policy Text Block] |  |  | 12 |
Number of customers that represent the percent of sales | percent | 0 |  | 0 |
Revenues | $ 6,000,000 |  |  |
10-year Termination Notice [Member] |  |  |  |
State [Line Items] |  |  |  |
Number of customers | Customers | 52 |  | 52 |
Long-Duration Contracts Revenue Recognition, Policy [Policy Text Block] |  |  | 1714 |
Number of customers that represent the percent of sales | percent | 0 |  | 0 |
Revenues | $ 862,000,000 |  |  |
6-year Termination Notice [Member] |  |  |  |
State [Line Items] |  |  |  |
Number of customers | Customers | 1 |  | 1 |
Long-Duration Contracts Revenue Recognition, Policy [Policy Text Block] |  |  | 25 |
Number of customers that represent the percent of sales | percent | 0 |  | 0 |
Revenues | $ 13,000,000 |  |  |
5-year termination notice [Member] |  |  |  |
State [Line Items] |  |  |  |
Number of customers | Customers | 86 |  | 86 |
Long-Duration Contracts Revenue Recognition, Policy [Policy Text Block] |  |  | 2912 |
Number of customers that represent the percent of sales | percent | 1 |  | 1 |
Revenues | $ 1,472,000,000 |  |  |

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