CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
OPERATING REVENUES	$ 3,691,247	$ 3,565,296	$ 3,498,682
OPERATING EXPENSES
Fuel and purchased power	1,076,116	981,301	1,075,510
Operations and maintenance	1,036,744	949,107	931,692
Depreciation and amortization	582,354	534,118	485,829
Taxes other than income taxes	212,849	184,347	166,499
Other expenses	9,497	6,660	3,541
Total	2,917,560	2,655,533	2,663,071
OPERATING INCOME	773,687	909,763	835,611
OTHER INCOME (DEDUCTIONS)
Allowance for equity funds used during construction (Note 1)	52,319	47,011	42,140
Pension and other postretirement non-service credits - net (Note 7)	49,791	24,664	20,373
Other income (Note 17)	24,896	4,006	901
Other expense (Note 17)	(17,966)	(21,539)	(15,337)
Total	109,040	54,142	48,077
INTEREST EXPENSE
Interest charges	243,465	219,796	205,720
Allowance for borrowed funds used during construction (Note 1)	(25,180)	(22,112)	(19,970)
Total	218,285	197,684	185,750
INCOME BEFORE INCOME TAXES	664,442	766,221	697,938
INCOME TAXES (Note 4)	133,902	258,272	236,411
NET INCOME	530,540	507,949	461,527
Less: Net income attributable to noncontrolling interests (Note 18)	19,493	19,493	19,493
NET INCOME ATTRIBUTABLE TO COMMON SHAREHOLDERS	$ 511,047	$ 488,456	$ 442,034
Weighted Average common shares outstanding — basic (in shares)	112,129	111,839	111,409
Weighted Average common shares outstanding — diluted (in shares)	112,550	112,367	112,046
EARNINGS PER WEIGHTED-AVERAGE COMMON SHARE OUTSTANDING
Net income attributable to common shareholders - basic (in dollars per share)	$ 4.56	$ 4.37	$ 3.97
Net income attributable to common shareholders — diluted (in dollars per share)	$ 4.54	$ 4.35	$ 3.95
ARIZONA PUBLIC SERVICE COMPANY
OPERATING REVENUES	$ 3,688,342	$ 3,557,652	$ 3,498,090
OPERATING EXPENSES
Fuel and purchased power	1,094,020	992,744	1,082,625
Operations and maintenance	969,227	917,983	902,467
Depreciation and amortization	580,694	532,423	484,909
Taxes other than income taxes	212,136	183,254	166,064
Other expenses	2,497	6,709	3,540
Total	2,858,574	2,633,113	2,639,605
OPERATING INCOME	829,768	924,539	858,485
OTHER INCOME (DEDUCTIONS)
Allowance for equity funds used during construction (Note 1)	52,319	47,011	42,140
Pension and other postretirement non-service credits - net (Note 7)	51,242	24,371	20,224
Other income (Note 17)	22,746	3,013	271
Other expense (Note 17)	(15,292)	(13,913)	(10,554)
Total	111,015	60,482	52,081
INTEREST EXPENSE
Interest charges	231,391	214,163	202,571
Allowance for borrowed funds used during construction (Note 1)	(25,180)	(22,112)	(19,481)
Total	206,211	192,051	183,090
INCOME BEFORE INCOME TAXES	734,572	792,970	727,476
INCOME TAXES (Note 4)	144,814	269,168	245,842
NET INCOME	589,758	523,802	481,634
Less: Net income attributable to noncontrolling interests (Note 18)	19,493	19,493	19,493
NET INCOME ATTRIBUTABLE TO COMMON SHAREHOLDERS	$ 570,265	$ 504,309	$ 462,141