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Summary of Significant Accounting Policies - Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Cash and Cash Equivalents [Line Items] |  |  |
Income taxes, net of refunds | $ 12,535 | $ 21,173 | $ 2,186
Interest, net of amounts capitalized | 218,664 | 208,479 | 189,288
Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract] |  |  |
Accrued capital expenditures | 141,297 | 132,620 | 130,404
Dividends declared but not paid | 87,982 | 82,675 | 77,667
Right-of-use operating lease assets obtained in exchange for operating lease liabilities | 11,262 | 0 | 0
Sale of 4CA 7% interest in Four Corners | 0 | 68,907 | 0
ARIZONA PUBLIC SERVICE COMPANY |  |  |
Cash and Cash Equivalents [Line Items] |  |  |
Income taxes, net of refunds | (15,042) | 77,942 | (14,098)
Interest, net of amounts capitalized | 204,261 | 196,419 | 184,210
Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract] |  |  |
Accrued capital expenditures | 141,297 | 132,620 | 130,057
Dividends declared but not paid | 88,000 | 82,700 | 77,700
Right-of-use operating lease assets obtained in exchange for operating lease liabilities | $ 11,262 | $ 0 | $ 0

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