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Revenue Local Power Company Contracts (Details) | 3 Months Ended
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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

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