Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 275
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Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 450
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Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 450
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 720
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-Topic 460
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-Section 55
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482395/460-10-55-27

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Topic 450
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-Topic 450
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-Topic 460
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-Topic 450
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Tabular disclosure of each guarantee obligation, or each group of similar guarantee obligations, including (a) the nature of the guarantee, including its term, how it arose, and the events or circumstances that would require the guarantor to perform under the guarantee; (b) the maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee; (c) the current carrying amount of the liability, if any, for the guarantor's obligations under the guarantee; and (d) the nature of any recourse provisions under the guarantee, and any assets held either as collateral or by third parties, and any relevant related party disclosure. Excludes disclosures about product warranties.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 460
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482425/460-10-50-4

Tabular disclosure of information concerning the terms and significance of long term contracts to purchase power (generally referred to as purchase power agreements (PPAs) or power sale agreements (PSAs)) including date of contract expiration, share of plant output being purchased, estimated annual cost, annual minimum debt service payment required and amount of related long-term debt or lease obligations outstanding.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 980
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-Subparagraph (SAB Topic 10.D)
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-URI https://asc.fasb.org/1943274/2147480114/980-10-S99-1