Derivative Accounting - Narrative (Details) - USD ($) |
3 Months Ended | 6 Months Ended | ||
---|---|---|---|---|
Jun. 30, 2019 |
Jun. 30, 2018 |
Jun. 30, 2019 |
Jun. 30, 2018 |
|
Commodity Contracts | ||||
Derivative Accounting | ||||
Additional collateral to counterparties for energy related non-derivative instrument contracts | $ 95,000,000 | $ 95,000,000 | ||
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 | 0 | $ 0 |
Estimated loss before income taxes to be reclassified from accumulated other comprehensive income | $ 1,000,000 | |||
APS | ||||
Derivative Accounting | ||||
Percentage of unrealized gains and losses on certain derivatives deferred for future rate treatment | 100.00% | 100.00% |