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Income Taxes - Additional Information (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2020 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2017
Income Taxes |  |  |  |
Reduction in net deferred income tax liabilities |  |  |  | $ 1,140
Income tax benefit |  | $ 31 | $ 31 |
Amortization period |  | 28 years 6 months |  |
Income tax expense attributable to non controlling interests |  | $ 0 |  |
Interest expense to be received on the underpayment of income taxes |  | 1 |  |
Increase (decrease) in deferred income taxes due to regulation adoption |  | 42 |  |
Arizona Public Service Company |  |  |  |
Income Taxes |  |  |  |
Increase (decrease) in deferred income taxes due to regulation adoption |  | 9 |  |
Federal |  |  |  |
Income Taxes |  |  |  |
Income tax benefit | $ 14 |  |  |
General business tax credit carryforwards |  | 51 |  |
State |  |  |  |
Income Taxes |  |  |  |
State credit carryforwards net of federal benefit |  | 42 |  |
Arizona net operating loss carryforwards net of federal benefit |  | 6 |  |
State | Arizona Public Service Company |  |  |  |
Income Taxes |  |  |  |
State credit carryforwards net of federal benefit |  | 24 |  |
Arizona net operating loss carryforwards net of federal benefit |  | $ 4 |  |

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- Definition Represents the amount of interest income to be received on the overpayment of income taxes for certain adjustments that the company has filed, or will file, with the IRS. + References No definition available. + Details
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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to other deductions. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=121826272&loc=d3e32687-109319 + Details
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