Jointly-Owned Facilities (Details) - Arizona Public Service Company $ in Thousands	Dec. 31, 2022 USD ($)
Palo Verde Units 1 and 3
Interests in jointly-owned facilities
Percent Owned	29.10%
Plant in Service	$ 1,947,593
Accumulated Depreciation	1,099,132
Construction Work in Progress	$ 39,933
Palo Verde Unit 2
Interests in jointly-owned facilities
Percent Owned	16.80%
Plant in Service	$ 659,514
Accumulated Depreciation	383,775
Construction Work in Progress	$ 14,784
Palo Verde Common
Interests in jointly-owned facilities
Percent Owned	28.00%
Plant in Service	$ 799,794
Accumulated Depreciation	346,705
Construction Work in Progress	52,631
Palo Verde Sale Leaseback
Interests in jointly-owned facilities
Plant in Service	351,050
Accumulated Depreciation	260,754
Construction Work in Progress	$ 0
Four Corners Generating Station
Interests in jointly-owned facilities
Percent Owned	63.00%
Plant in Service	$ 1,665,042
Accumulated Depreciation	620,918
Construction Work in Progress	$ 46,643
Cholla Common Facilities
Interests in jointly-owned facilities
Percent Owned	50.50%
Plant in Service	$ 207,104
Accumulated Depreciation	140,886
Construction Work in Progress	$ 2,988
ANPP 500kV System
Interests in jointly-owned facilities
Percent Owned	33.40%
Plant in Service	$ 133,887
Accumulated Depreciation	55,704
Construction Work in Progress	$ 2,820
Navajo Southern System
Interests in jointly-owned facilities
Percent Owned	26.80%
Plant in Service	$ 90,345
Accumulated Depreciation	36,929
Construction Work in Progress	$ 1,945
Palo Verde — Yuma 500kV System
Interests in jointly-owned facilities
Percent Owned	25.40%
Plant in Service	$ 24,026
Accumulated Depreciation	7,559
Construction Work in Progress	$ 128
Four Corners Switchyards
Interests in jointly-owned facilities
Percent Owned	61.90%
Plant in Service	$ 73,243
Accumulated Depreciation	20,350
Construction Work in Progress	$ 120
Phoenix — Mead System
Interests in jointly-owned facilities
Percent Owned	17.10%
Plant in Service	$ 39,705
Accumulated Depreciation	20,055
Construction Work in Progress	$ 51
Palo Verde — Rudd 500kV System
Interests in jointly-owned facilities
Percent Owned	50.00%
Plant in Service	$ 95,736
Accumulated Depreciation	31,118
Construction Work in Progress	$ 391
Morgan — Pinnacle Peak System
Interests in jointly-owned facilities
Percent Owned	64.70%
Plant in Service	$ 119,785
Accumulated Depreciation	25,791
Construction Work in Progress	$ 96
Round Valley System
Interests in jointly-owned facilities
Percent Owned	50.00%
Plant in Service	$ 548
Accumulated Depreciation	193
Construction Work in Progress	$ 0
Palo Verde — Morgan System
Interests in jointly-owned facilities
Percent Owned	87.80%
Plant in Service	$ 263,576
Accumulated Depreciation	34,415
Construction Work in Progress	$ 1,414
Hassayampa — North Gila System
Interests in jointly-owned facilities
Percent Owned	80.00%
Plant in Service	$ 148,174
Accumulated Depreciation	22,566
Construction Work in Progress	$ 3,771
Cholla 500kV Switchyard
Interests in jointly-owned facilities
Percent Owned	85.70%
Plant in Service	$ 8,100
Accumulated Depreciation	2,380
Construction Work in Progress	$ 0
Saguaro 500kV Switchyard
Interests in jointly-owned facilities
Percent Owned	60.00%
Plant in Service	$ 21,656
Accumulated Depreciation	13,809
Construction Work in Progress	$ 0
Kyrene — Knox System
Interests in jointly-owned facilities
Percent Owned	50.00%
Plant in Service	$ 578
Accumulated Depreciation	336
Construction Work in Progress	$ 0
Agua Fria Switchyard
Interests in jointly-owned facilities
Percent Owned	10.00%
Plant in Service	$ 0
Accumulated Depreciation	0
Construction Work in Progress	$ 32