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Summary of Significant Accounting Policies - Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Cash and Cash Equivalents [Line Items] |  |  |
Income taxes, net of refunds | $ 229 | $ (3,019) | $ 12,535
Interest, net of amounts capitalized | 227,584 | 216,951 | 218,664
Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract] |  |  |
Accrued capital expenditures | 167,733 | 113,502 | 141,297
Dividends declared but not paid | 95,988 | 93,531 | 87,982
Arizona Public Service Company |  |  |
Cash and Cash Equivalents [Line Items] |  |  |
Income taxes, net of refunds | 19,783 | 41,176 | (15,042)
Interest, net of amounts capitalized | 217,749 | 206,328 | 204,261
Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract] |  |  |
Accrued capital expenditures | 167,657 | 113,502 | 141,297
Dividends declared but not paid | $ 96,000 | $ 93,500 | $ 88,000

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