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Derivative Accounting - Narrative (Details) - USD ($) |  | 3 Months Ended
--- | --- | ---
Mar. 31, 2021 | Mar. 31, 2021 | Mar. 31, 2020
Derivative Accounting |  |  |
Amounts reclassified from accumulated other comprehensive income in next twelve months |  | $ 0 |
Commodity Contracts |  |  |
Derivative Accounting |  |  |
Aggregate fair value of derivative instruments in a net liability position | $ 11,520,000 | 11,520,000 |
Additional collateral to counterparties for energy related non-derivative instrument contracts | $ 86,000,000 | 86,000,000 |
Commodity Contracts | Designated as Hedging Instruments |  |  |
Derivative Accounting |  |  |
Amount reclassified from accumulated other comprehensive income to earnings related to discontinued cash flow hedges |  | $ 0 | $ 0
APS |  |  |
Derivative Accounting |  |  |
Percentage of unrealized gains and losses on certain derivatives deferred for future rate treatment | 100.00% | 100.00% |
Risk Management Assets | Credit Concentration Risk |  |  |
Derivative Accounting |  |  |
Concentration risk | 59.00% |  |
Aggregate fair value of derivative instruments in a net liability position | $ 26,000,000 | $ 26,000,000 |

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- Definition The aggregate fair value of additional assets that would be required to be posted as collateral for non-derivative instruments with credit-risk related contingent features if the credit-risk-related contingent features were triggered at the end of the reporting period. + References No definition available. + Details
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- Definition For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 42 -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e9054-108599 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6351-108592 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=121572278&loc=d3e13531-108611 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121572278&loc=d3e13537-108611 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6404-108592 + Details
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