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Revenues from Contracts with Customers - Disaggregation of Revenue by Identified Revenue Stream (Parenthetical) (Detail) $ in Millions | 6 Months Ended
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Jun. 30, 2021 USD ($)
Brokered Natural Gas, Marketing and Other | Other marketing revenue |
Disaggregation of Revenue [Line Items] |
Revenue received as part of capital release agreement | $ 8.8

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- Definition Revenue received as part of capital release agreement. + References No definition available. + Details
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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
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Balance Type: |
Period Type: |