Retirement Plans and Other Postretirement Benefits - Additional Information (Details) - USD ($)		12 Months Ended
	Jan. 04, 2021	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items]
Initial pre-65 ultimate health care cost trend rate (as a percent)		4.75%	4.75%	4.75%
Initial post-65 healthcare cost trend rate (as a percent)		2.00%	2.00%
Funded percentage (more than)		100.00%
Partnership funding commitments, contribution amount (up to)		$ 50,000,000
Partnership funding commitments, funded amount		38,000,000
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Transfer to active union medical account	$ (106,000,000)	$ 0	$ 0
Expected long-term return on plan assets for next fiscal year (as a percent)		5.00%
Contributions
Employer contributions		$ 100,000,000	100,000,000	$ 150,000,000
Minimum contributions under MAP-21
Minimum contributions under MAP-21		0
Other Benefits
Defined Benefit Plan Disclosure [Line Items]
Transfer to active union medical account	106,000,000	$ 105,852,000	0
Expected long-term return on plan assets for next fiscal year (as a percent)		5.50%
Contributions
Employer contributions		$ 0	0
Minimum contributions under MAP-21
Retiree medical cost reimbursement		24,000,000	26,000,000	30,000,000
Pinnacle West
Minimum contributions under MAP-21
Expenses recorded for the defined contribution savings plan		$ 12,000,000	$ 11,000,000	$ 11,000,000
Arizona Public Service Company
Minimum contributions under MAP-21
APS's employees share of total cost of the plans (as a percent)		99.00%
Arizona Public Service Company | Other Benefits
Defined Benefit Plan Disclosure [Line Items]
Transfer to active union medical account	$ 106,000,000