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v3.20.2

Related Parties Related Parties (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2018
Related Parties |  |  |  |  |  |  |  |  |  |  |
Remaining appropriation investment | $ 258 |  |  |  |  |  |  |  | $ 258 |  |
Current borrowing capacity | 150 |  |  |  |  |  |  |  | 150 |  |
Revenue from sales of electricity | 2,899 | $ 2,251 | $ 2,521 | $ 2,578 | $ 3,239 | $ 2,604 | $ 2,750 | $ 2,725 | 10,249 | $ 11,318 | $ 11,233
Other income |  |  |  |  |  |  |  |  |  | 21 | 0
Long-term Investments | 3,198 |  |  |  | 2,968 |  |  |  | 3,198 | 2,968 |
Return on power program appropriation investment |  |  |  |  |  |  |  |  | (6) | (6) | (5)
Related Party Transactions |  |  |  |  |  |  |  |  |  |  |
Related Parties |  |  |  |  |  |  |  |  |  |  |
Revenue from sales of electricity |  |  |  |  |  |  |  |  | 105 | 118 | 122
Other income |  |  |  |  |  |  |  |  | 260 | 258 | 240
Operating expenses |  |  |  |  |  |  |  |  | 224 | 222 | 220
Additions to property, plant, and equipment |  |  |  |  |  |  |  |  | 9 | 10 | 8
Cash and cash equivalents | 31 |  |  |  | 45 |  |  |  | 31 | 45 | 46
Receivables from Customers | 94 |  |  |  | 76 |  |  |  | 94 | 76 | 60
Long-term Investments | 485 |  |  |  | 279 |  |  |  | 485 | 279 | 199
Receivables, Long-term Contracts or Programs | 27 |  |  |  | 53 |  |  |  | 27 | 53 | 46
Accounts payable and accrued liabilities | 39 |  |  |  | 69 |  |  |  | 39 | 69 | 69
Long-term power bonds, net | $ 1 |  |  |  | $ 0 |  |  |  | 1 | 0 | 0
Return on power program appropriation investment |  |  |  |  |  |  |  |  | $ (6) | $ (6) | $ (5)

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