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Derivative Accounting (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2019 USD ($)
ARIZONA PUBLIC SERVICE COMPANY |
Derivative [Line Items] |
Percentage of unrealized gains and losses on certain derivatives deferred for future rate treatment before accounting treatment change | 100.00%
Commodity Contracts |
Derivative [Line Items] |
Additional collateral to counterparties for energy related non-derivative instrument contracts | $ 95.0
Commodity Contracts | Designated as Hedging Instruments |
Derivative [Line Items] |
Estimated net loss before income taxes to be reclassified from accumulated other comprehensive income | $ 0.8
Risk Management Assets | Credit Concentration Risk |
Derivative [Line Items] |
Concentration risk, percentage | 10.00%

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