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Revenue Local Power Company Contracts (Details)
 3 Months Ended
Dec. 31, 2018
USD ($)
Customers
percent
Long-term Contract for Purchase of Electric Power [Line Items]  
Total number of customers | $ 154
Total number of customers that represent the percent of sales 1
Total long-duration contracts revenue recognition | $ 2,468,000,000
5-year Termination Notice [Member]  
Long-term Contract for Purchase of Electric Power [Line Items]  
Number of customers | Customers 86
Number of customers that represent the percent of sales 1
Long-Duration Contracts Revenue Recognition, Policy [Policy Text Block] 1441
6-year Termination Notice [Member]  
Long-term Contract for Purchase of Electric Power [Line Items]  
Number of customers | Customers 1
Number of customers that represent the percent of sales 0
Long-Duration Contracts Revenue Recognition, Policy [Policy Text Block] 12
10-year Termination Notice [Member]  
Long-term Contract for Purchase of Electric Power [Line Items]  
Number of customers | Customers 52
Number of customers that represent the percent of sales 0
Long-Duration Contracts Revenue Recognition, Policy [Policy Text Block] 852
12-year Termination Notice [Member]  
Long-term Contract for Purchase of Electric Power [Line Items]  
Number of customers | Customers 1
Number of customers that represent the percent of sales 0
Long-Duration Contracts Revenue Recognition, Policy [Policy Text Block] 6
15-year Termination Notice [Member]  
Long-term Contract for Purchase of Electric Power [Line Items]  
Number of customers | Customers 11
Number of customers that represent the percent of sales 0
Long-Duration Contracts Revenue Recognition, Policy [Policy Text Block] 124
20-year Termination Notice [Member]  
Long-term Contract for Purchase of Electric Power [Line Items]  
Number of customers | Customers 3
Number of customers that represent the percent of sales 0
Long-Duration Contracts Revenue Recognition, Policy [Policy Text Block] 33