XML 113 R85.htm IDEA: XBRL DOCUMENT v3.21.2
Revenue Local Power Company Contracts (Details)
$ in Millions
 3 Months Ended 9 Months Ended
Jun. 30, 2021
USD ($)
Units
Jun. 30, 2020
USD ($)
Jun. 30, 2021
USD ($)
Units
Jun. 30, 2020
USD ($)
Long-term Contract for Purchase of Electric Power [Line Items]        
Long-Duration Contracts Revenue Recognition, Policy [Policy Text Block] $ 2,527 $ 2,251 $ 7,403 $ 7,350
Total long-duration contracts revenue recognition 2,283   6,711  
Total percentage of operating revenues 90.30%   90.70%  
Number of LPCs signed LTA | Units 142   142  
Total Number of LPCs | Units 153   153  
Percent of op revenues of LPCs who filed complaint with FERC     400.00%  
5-year Termination Notice [Member]        
Long-term Contract for Purchase of Electric Power [Line Items]        
Long-Duration Contracts Revenue Recognition, Policy [Policy Text Block] $ 432   $ 1,206  
Percentage of total operating revenues 17.10%   16.30%  
Number of LPCs signed LTA | Units 11   11  
20-year Termination Notice [Member]        
Long-term Contract for Purchase of Electric Power [Line Items]        
Long-Duration Contracts Revenue Recognition, Policy [Policy Text Block] $ 1,851   $ 5,505  
Percentage of total operating revenues 73.20%   74.40%