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Commitments and Contingencies - Additional Information (Details) - USD ($) $ in Thousands |  |  |  |  | 12 Months Ended
--- | --- | --- | --- | --- | ---
Nov. 02, 2021 | Feb. 22, 2021 | Jul. 03, 2018 | Jul. 06, 2016 | Dec. 31, 2021
Financial Assurances |  |  |  |  |
Equity contribution guarantees |  |  |  |  | $ 2,000
Production tax credit guarantees |  |  |  |  | 37,000
2017 Settlement Agreement and its Customer Education and Outreach Plan | Arizona Public Service Company |  |  |  |  |
Arizona Attorney General [Abstract] |  |  |  |  |
Settlement amount |  | $ 24,750 |  |  |
Settlement amount returned to customers |  | $ 24,000 |  |  |
Letter of Credit | Arizona Public Service Company |  |  |  |  |
Financial Assurances |  |  |  |  |
Outstanding letters of credit |  |  |  |  | 5,000
Four Corners Units 4 and 5 | Arizona Public Service Company | SCE |  |  |  |  |
Four Corners SCR Cost Recovery [Abstract] |  |  |  |  |
Recommended rate adjustment, annualized customer impact, disallowance of investments | $ 194,000 |  |  |  |
Recommended rate adjustment, annualized customer impact, cost deferrals | $ 215,500 |  |  |  |
Potential charges |  |  |  |  | 154,400
Four Corners | NTEC |  |  |  |  |
Environmental Matters |  |  |  |  |
Option to purchase, ownership interest (as a percent) |  |  | 7.00% | 7.00% |
Payment received for coal supply agreement |  |  | $ 70,000 |  |
Four Corners | 4CA |  |  |  |  |
Environmental Matters |  |  |  |  |
Percentage share cost of control |  |  |  | 7.00% |
Remaining balance of notes |  |  |  |  | $ 9,200
Regional Haze Rules | Four Corners Units 4 and 5 | Arizona Public Service Company |  |  |  |  |
Environmental Matters |  |  |  |  |
Percentage share cost of control |  |  |  |  | 63.00%
Expected environmental cost |  |  |  |  | $ 400,000
Regional Haze Rules | Four Corners Units 4 and 5 | Four Corners | Arizona Public Service Company |  |  |  |  |
Environmental Matters |  |  |  |  |
Additional expected environment cost |  |  |  |  | $ 45,000
Regional Haze Rules | Four Corners Units 4 and 5 | Natural Gas Tolling Letter of Credit | Arizona Public Service Company |  |  |  |  |
Environmental Matters |  |  |  |  |
Additional percentage share of cost of control |  |  |  |  | 7.00%
Coal Combustion Waste | Four Corners | Arizona Public Service Company |  |  |  |  |
Environmental Matters |  |  |  |  |
Additional expected environment cost |  |  |  |  | $ 30,000
Coal Combustion Waste | Navajo Generating Station | Arizona Public Service Company |  |  |  |  |
Environmental Matters |  |  |  |  |
Additional expected environment cost |  |  |  |  | 1,000
Coal Combustion Waste | Minimum | Cholla | Arizona Public Service Company |  |  |  |  |
Environmental Matters |  |  |  |  |
Additional expected environment cost |  |  |  |  | 16,000
Coal Combustion Waste | Minimum | Cholla and Four Corners | Arizona Public Service Company |  |  |  |  |
Environmental Matters |  |  |  |  |
Additional expected environment cost |  |  |  |  | 10,000
Coal Combustion Waste | Maximum | Cholla and Four Corners | Arizona Public Service Company |  |  |  |  |
Environmental Matters |  |  |  |  |
Additional expected environment cost |  |  |  |  | 15,000
Surety Bonds Expiring in 2020 | Arizona Public Service Company |  |  |  |  |
Financial Assurances |  |  |  |  |
Surety bonds expiring, amount |  |  |  |  | $ 14,000

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