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Derivative Financial Instruments (Details 2) MMBTU in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2021 USD ($) MMBTU | Sep. 30, 2020 USD ($) | Sep. 30, 2021 USD ($) MMBTU | Sep. 30, 2020 USD ($) | Dec. 31, 2020 USD ($) MMBTU
Derivative Instruments and Hedging Activities Disclosure [Abstract] |  |  |  |  |
Notional Nonmonetary Amount of Price Risk Derivative Instruments Not Designated as Hedging Instruments | MMBTU | 20.7 |  | 20.7 |  | 34.1
Percentage of Consumption Hedged by Derivatives |  |  | 9.00% |  |
Fair values of derivatives on consolidated balance sheets |  |  |  |  |
Cash collateral on deposit with derivative counterparties | $ 0 |  | $ 0 |  | $ 0
Aggregate fair value of the derivative instruments with credit risk related contingent features in a net liability position | 0 |  | 0 |  | 6,000,000
Cash collateral on deposit with derivative counterparties | 0 |  | 0 |  | 0
Winter Storm Uri |  |  |  |  |
Fair values of derivatives on consolidated balance sheets |  |  |  |  |
Gain (Loss) on Sale of Derivatives | 0 | $ 0 | 112,000,000 | $ 0 |
Not Designated as Hedging Instrument |  |  |  |  |
Fair values of derivatives on consolidated balance sheets |  |  |  |  |
Derivative Asset | 15,000,000 |  | 15,000,000 |  | 1,000,000
Derivative Liability | 3,000,000 |  | 3,000,000 |  | 7,000,000
Cash collateral on deposit with derivative counterparties | 0 |  | 0 |  | 0
Cash collateral on deposit with derivative counterparties | 0 |  | 0 |  | 0
Not Designated as Hedging Instrument | Energy Related Derivative |  |  |  |  |
Fair values of derivatives on consolidated balance sheets |  |  |  |  |
Derivative Asset | 15,000,000 |  | 15,000,000 |  | 1,000,000
Derivative Liability | 3,000,000 |  | 3,000,000 |  | $ 7,000,000
Designated as Hedging Instrument |  |  |  |  |
Fair values of derivatives on consolidated balance sheets |  |  |  |  |
Derivative Asset | $ 0 |  | $ 0 |  |

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- Definition Aggregate notional amount of price risk derivatives not designated as a hedging instrument with notional amounts expressed in nonmonetary units. + References No definition available. + Details
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- Definition Percentage of an entity's commodity consumptions that is covered by a derivative. + References No definition available. + Details
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- Definition Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226008-175313 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 22 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226052-175313 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=123594938&loc=d3e13433-108611 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 + Details
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- Definition Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226008-175313 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=123594938&loc=d3e13433-108611 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 22 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226052-175313 + Details
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