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Debt and Equity Securities, Unrealized Loss

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Debt Securities, Available-for-sale, Other, Unrealized Loss

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Decommissioning And Other Special Use Fund Investments, Fair Value

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Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount of unrealized gain on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount of unrealized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Fair value of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in sixth through tenth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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Fair value of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in second through fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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Fair value of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing after tenth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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Fair value of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in next fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount of realized gain on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount of realized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

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Amount of unrealized gain on investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

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Amount of unrealized loss on investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

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Sum of the carrying amounts as of the balance sheet date of all investments.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Investments in Nuclear Decommissioning Trusts and Other Special Use Funds (Details) - APS - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022
Nuclear decommissioning trust fund assets
Fair Value	$ 1,478,494		$ 1,420,641
Total Unrealized Gains	374,520		337,994
Total Unrealized Losses	(54,228)		(69,091)
Amortized cost	981,000		927,000
Realized gains and losses and proceeds from the sale of securities by the nuclear decommissioning trust funds
Realized gains	1,210	$ 1,023
Realized losses	(5,694)	(7,235)
Proceeds from the sale of securities	226,626	361,238
Nuclear Decommissioning Trusts
Nuclear decommissioning trust fund assets
Fair Value	1,125,617		1,073,410
Realized gains and losses and proceeds from the sale of securities by the nuclear decommissioning trust funds
Realized gains	1,210	1,023
Realized losses	(5,694)	(7,235)
Proceeds from the sale of securities	136,185	319,693
Other Special Use Funds
Nuclear decommissioning trust fund assets
Fair Value	352,877		347,231
Realized gains and losses and proceeds from the sale of securities by the nuclear decommissioning trust funds
Realized gains	0	0
Realized losses	0	0
Proceeds from the sale of securities	90,441	$ 41,545
Equity securities
Nuclear decommissioning trust fund assets
Equity securities	545,013		554,214
Total Unrealized Gains	367,791		334,817
Total Unrealized Losses	(39)		(267)
Equity securities \| Nuclear Decommissioning Trusts
Nuclear decommissioning trust fund assets
Equity securities	517,371		487,240
Equity securities \| Other Special Use Funds
Nuclear decommissioning trust fund assets
Equity securities	27,642		66,974
Available for sale-fixed income securities
Nuclear decommissioning trust fund assets
Fair Value	933,575		861,637
Total Unrealized Gains	6,728		3,177
Total Unrealized Losses	(54,178)		(68,795)
Fair value of fixed income securities, summarized by contractual maturities
Less than one year	143,097
1 year – 5 years	321,766
5 years – 10 years	182,543
Greater than 10 years	286,169
Total	933,575
Available for sale-fixed income securities \| Nuclear Decommissioning Trusts
Nuclear decommissioning trust fund assets
Fair Value	609,381		582,343
Fair value of fixed income securities, summarized by contractual maturities
Less than one year	14,591
1 year – 5 years	174,911
5 years – 10 years	137,708
Greater than 10 years	282,171
Total	609,381
Available for sale-fixed income securities \| Other Special Use Funds
Nuclear decommissioning trust fund assets
Fair Value	324,194		279,294
Available for sale-fixed income securities \| Coal Reclamation Escrow Account
Fair value of fixed income securities, summarized by contractual maturities
Less than one year	53,718
1 year – 5 years	36,821
5 years – 10 years	0
Greater than 10 years	3,998
Total	94,537
Available for sale-fixed income securities \| Active Union Employee Medical Account
Fair value of fixed income securities, summarized by contractual maturities
Less than one year	74,788
1 year – 5 years	110,034
5 years – 10 years	44,835
Greater than 10 years	0
Total	229,657
Other
Nuclear decommissioning trust fund assets
Fair Value	(94)		4,790
Total Unrealized Gains	1		0
Total Unrealized Losses	(11)		(29)
Other \| Nuclear Decommissioning Trusts
Nuclear decommissioning trust fund assets
Fair Value	(1,135)		3,827
Other \| Other Special Use Funds
Nuclear decommissioning trust fund assets
Fair Value	$ 1,041		$ 963