Commitments and Contingencies - Superfund-Related Matters, Southwest Power Outage and Clean Air Act (Details) - APS - Contaminated groundwater wells $ in Millions |
6 Months Ended | |||
---|---|---|---|---|
Apr. 05, 2018
plaintiff
|
Dec. 16, 2016
plaintiff
|
Aug. 06, 2013
Defendant
|
Jun. 30, 2019
USD ($)
|
|
Loss Contingencies [Line Items] | ||||
Costs related to investigation and study under Superfund site | $ | $ 2 | |||
Number of defendants against whom Roosevelt Irrigation District (RID) filed lawsuit | Defendant | 24 | |||
Number of plaintiffs | 2 | |||
Settled Litigation | ||||
Loss Contingencies [Line Items] | ||||
Number of plaintiffs | 2 |