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Revenue Local Power Company Contracts (Details)
 3 Months Ended 9 Months Ended
Jun. 30, 2019
USD ($)
Customers
percent
Jun. 30, 2018
USD ($)
Jun. 30, 2019
USD ($)
Customers
percent
Jun. 30, 2018
USD ($)
Long-term Contract for Purchase of Electric Power [Line Items]        
Total number of customers 154   154  
Long-Duration Contracts Revenue Recognition, Policy [Policy Text Block] $ 2,604,000,000 $ 2,707,000,000 $ 8,079,000,000 $ 8,048,000,000
Total number of customers that represent the percent of sales | percent 1   1  
Total long-duration contracts revenue recognition 2,366,000,000   7,347,000,000  
5-year Termination Notice [Member]        
Long-term Contract for Purchase of Electric Power [Line Items]        
Number of customers | Customers 86   86  
Number of customers that represent the percent of sales | percent 1   1  
Long-Duration Contracts Revenue Recognition, Policy [Policy Text Block] $ 1,387,000,000      
6-year Termination Notice [Member]        
Long-term Contract for Purchase of Electric Power [Line Items]        
Number of customers | Customers 1   1  
Number of customers that represent the percent of sales | percent 0   0  
Long-Duration Contracts Revenue Recognition, Policy [Policy Text Block] $ 11,000,000      
10-year Termination Notice [Member]        
Long-term Contract for Purchase of Electric Power [Line Items]        
Number of customers | Customers 52   52  
Number of customers that represent the percent of sales | percent 0   0  
Long-Duration Contracts Revenue Recognition, Policy [Policy Text Block] $ 822,000,000      
12-year Termination Notice [Member]        
Long-term Contract for Purchase of Electric Power [Line Items]        
Number of customers | Customers 1   1  
Number of customers that represent the percent of sales | percent 0   0  
Long-Duration Contracts Revenue Recognition, Policy [Policy Text Block] $ 6,000,000      
15-year Termination Notice [Member]        
Long-term Contract for Purchase of Electric Power [Line Items]        
Number of customers | Customers 11   11  
Number of customers that represent the percent of sales | percent 0   0  
Long-Duration Contracts Revenue Recognition, Policy [Policy Text Block] $ 112,000,000      
20-year Termination Notice [Member]        
Long-term Contract for Purchase of Electric Power [Line Items]        
Number of customers | Customers 3   3  
Number of customers that represent the percent of sales | percent 0   0  
Long-Duration Contracts Revenue Recognition, Policy [Policy Text Block] $ 28,000,000