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Risk Management Future Year Net Unrealized Gain/Loss Recorded at Balance Sheet Date Expected to Become Realized (Details) $ in Millions | Jun. 30, 2020 USD ($)
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Electricity [Member] |
Commodity contracts: |
2020 | $ (6)
2021 | (16)
2022 | (8)
2023 | 8
2024 | 8
Thereafter | 111
Total | (145)
Natural Gas [Member] |
Commodity contracts: |
2020 | (1)
2021 | (13)
2022 | (2)
2023 | 0
2024 | 0
Thereafter | 0
Total | (16)
Net Unrealized Loss [Member] |
Commodity contracts: |
2020 | (7)
2021 | (3)
2022 | (6)
2023 | 8
2024 | 8
Thereafter | 111
Total | $ (129)

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