XML 114 R81.htm IDEA: XBRL DOCUMENT v3.19.2
Revenue (Details)
 3 Months Ended 9 Months Ended
Jun. 30, 2019
USD ($)
Customers
percent
Jun. 30, 2018
USD ($)
Jun. 30, 2019
USD ($)
Customers
percent
Jun. 30, 2018
USD ($)
State [Line Items]        
Revenue Capitalized During Pre-Commercial Operations $ 0 $ (1,000,000) $ 0 $ (11,000,000)
Electric revenue (2,563,000,000) (2,667,000,000) (7,955,000,000) (7,936,000,000)
Sales of Electricity 2,565,000,000 2,669,000,000 7,958,000,000 7,931,000,000
Off System Sales of Electricity 2,000,000 2,000,000 3,000,000 6,000,000
Other revenue $ 39,000,000 38,000,000 $ 121,000,000 117,000,000
Total number of customers 154   154  
Total long duration contract revenue recognition 2,366,000,000   7,347,000,000  
Total number of customers that represent a percent of sales | percent 1   1  
Revenues $ 2,604,000,000 2,707,000,000 $ 8,079,000,000 8,048,000,000
ALABAMA        
State [Line Items]        
Electric revenue (367,000,000) (383,000,000) (1,146,000,000) (1,152,000,000)
GEORGIA        
State [Line Items]        
Electric revenue (59,000,000) (59,000,000) (196,000,000) (196,000,000)
KENTUCKY        
State [Line Items]        
Electric revenue (157,000,000) (171,000,000) (498,000,000) (504,000,000)
MISSISSIPPI        
State [Line Items]        
Electric revenue (250,000,000) (258,000,000) (751,000,000) (746,000,000)
NORTH CAROLINA        
State [Line Items]        
Electric revenue (15,000,000) (14,000,000) (56,000,000) (49,000,000)
TENNESSEE        
State [Line Items]        
Electric revenue (1,705,000,000) (1,771,000,000) (5,273,000,000) (5,252,000,000)
VIRGINIA        
State [Line Items]        
Electric revenue $ (10,000,000) $ (11,000,000) $ (35,000,000) $ (37,000,000)
20-year Termination Notice [Member]        
State [Line Items]        
Number of customers | Customers 3   3  
Long-Duration Contracts Revenue Recognition, Policy [Policy Text Block]     96  
Number of customers that represent the percent of sales | percent 0   0  
Revenues $ 28,000,000      
15-year Termination Notice [Member]        
State [Line Items]        
Number of customers | Customers 11   11  
Long-Duration Contracts Revenue Recognition, Policy [Policy Text Block]     362  
Number of customers that represent the percent of sales | percent 0   0  
Revenues $ 112,000,000      
12-year Termination Notice [Member]        
State [Line Items]        
Number of customers | Customers 1   1  
Long-Duration Contracts Revenue Recognition, Policy [Policy Text Block]     19  
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]     2536  
Number of customers that represent the percent of sales | percent 0   0  
Revenues $ 822,000,000      
6-year Termination Notice [Member]        
State [Line Items]        
Number of customers | Customers 1   1  
Long-Duration Contracts Revenue Recognition, Policy [Policy Text Block]     36  
Number of customers that represent the percent of sales | percent 0   0  
Revenues $ 11,000,000      
5-year termination notice [Member]        
State [Line Items]        
Number of customers | Customers 86   86  
Long-Duration Contracts Revenue Recognition, Policy [Policy Text Block]     4298  
Number of customers that represent the percent of sales | percent 1   1  
Revenues $ 1,387,000,000