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Retirement Plans and Other Benefits (Tables) | 12 Months Ended
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Dec. 31, 2016
Compensation and Retirement Disclosure [Abstract] |
Schedule of net periodic benefit costs and the portion of these costs charged to expense (including administrative costs and excluding amounts capitalized as overhead construction, billed to electric plant participants or charged or amortized to the regulatory asset) | The following table provides details of the plans’ net periodic benefit costs and the portion of these costs charged to expense (including administrative costs and excluding amounts capitalized as overhead construction, billed to electric plant participants or charged to the regulatory asset or liability) (dollars in thousands):
| Pension |  | Other Benefits
| 2016 |  | 2015 |  | 2014 |  | 2016 |  | 2015 |  | 2014
Service cost-benefits earned during the period | $ | 53,792 |  |  | $ | 59,627 |  |  | $ | 53,080 |  |  | $ | 14,993 |  |  | $ | 16,827 |  |  | $ | 18,139 |
Interest cost on benefit obligation | 131,647 |  |  | 123,983 |  |  | 129,194 |  |  | 29,721 |  |  | 28,102 |  |  | 41,243 |
Expected return on plan assets | (173,906 | ) |  | (179,231 | ) |  | (158,998 | ) |  | (36,495 | ) |  | (36,855 | ) |  | (46,400 | )
Amortization of: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Prior service cost (credit) | 527 |  |  | 594 |  |  | 869 |  |  | (37,883 | ) |  | (37,968 | ) |  | (9,626 | )
Net actuarial loss | 40,717 |  |  | 31,056 |  |  | 10,963 |  |  | 4,589 |  |  | 4,881 |  |  | 1,175 |
Net periodic benefit cost | $ | 52,777 |  |  | $ | 36,029 |  |  | $ | 35,108 |  |  | $ | (25,075 | ) |  | $ | (25,013 | ) |  | $ | 4,531 |
Portion of cost charged to expense | $ | 26,172 |  |  | $ | 20,036 |  |  | $ | 21,985 |  |  | $ | (12,435 | ) |  | $ | (10,391 | ) |  | $ | 6,000 |
Schedule of changes in the benefit obligations and funded status | The following table shows the plans’ changes in the benefit obligations and funded status for the years 2016 and 2015 (dollars in thousands):
| Pension |  | Other Benefits
| 2016 |  | 2015 |  | 2016 |  | 2015
Change in Benefit Obligation |  |  |  |  |  |  |  |  |  |  |
Benefit obligation at January 1 | $ | 3,033,803 |  |  | $ | 3,078,648 |  |  | $ | 647,020 |  |  | $ | 682,335 |
Service cost | 53,792 |  |  | 59,627 |  |  | 14,993 |  |  | 16,827 |
Interest cost | 131,647 |  |  | 123,983 |  |  | 29,721 |  |  | 28,102 |
Benefit payments | (142,247 | ) |  | (137,115 | ) |  | (26,231 | ) |  | (24,988 | )
Actuarial (gain) loss | 127,467 |  |  | (91,340 | ) |  | 50,942 |  |  | (55,256 | )
Benefit obligation at December 31 | 3,204,462 |  |  | 3,033,803 |  |  | 716,445 |  |  | 647,020 |
Change in Plan Assets |  |  |  |  |  |  |  |  |  |  |
Fair value of plan assets at January 1 | 2,542,774 |  |  | 2,615,404 |  |  | 833,017 |  |  | 834,625 |
Actual return on plan assets | 166,408 |  |  | (44,690 | ) |  | 63,463 |  |  | (2,399 | )
Employer contributions | 100,000 |  |  | 100,000 |  |  | 819 |  |  | 791 |
Benefit payments | (133,825 | ) |  | (127,940 | ) |  | (14,648 | ) |  | — |
Fair value of plan assets at December 31 | 2,675,357 |  |  | 2,542,774 |  |  | 882,651 |  |  | 833,017 |
Funded Status at December 31 | $ | (529,105 | ) |  | $ | (491,029 | ) |  | $ | 166,206 |  |  | $ | 185,997 |
Schedule of projected benefit obligation and the accumulated benefit obligation for pension plans with an accumulated obligation in excess of plan assets | The following table shows the projected benefit obligation and the accumulated benefit obligation for pension plans with an accumulated obligation in excess of plan assets as of December 31, 2016 and 2015 (dollars in thousands):
| 2016 |  | 2015
Projected benefit obligation | $ | 3,204,462 |  |  | $ | 3,033,803 |
Accumulated benefit obligation | 3,049,406 |  |  | 2,873,467 |
Fair value of plan assets | 2,675,357 |  |  | 2,542,774 |
Schedule of amounts recognized on the Consolidated Balance Sheets | The following table shows the amounts recognized on the Consolidated Balance Sheets as of December 31, 2016 and 2015 (dollars in thousands):
| Pension |  | Other Benefits
| 2016 |  | 2015 |  | 2016 |  | 2015
Noncurrent asset | $ | — |  |  | $ | — |  |  | $ | 166,206 |  |  | $ | 185,997 |
Current liability | (19,795 | ) |  | (10,031 | ) |  | — |  |  | — |
Noncurrent liability | (509,310 | ) |  | (480,998 | ) |  | — |  |  | — |
Net amount recognized | $ | (529,105 | ) |  | $ | (491,029 | ) |  | $ | 166,206 |  |  | $ | 185,997 |
Schedule of accumulated other comprehensive loss | The following table shows the details related to accumulated other comprehensive loss as of December 31, 2016 and 2015 (dollars in thousands):
| Pension |  | Other Benefits
| 2016 |  | 2015 |  | 2016 |  | 2015
Net actuarial loss | $ | 773,750 |  |  | $ | 679,501 |  |  | $ | 146,509 |  |  | $ | 127,124 |
Prior service cost (credit) | 81 |  |  | 609 |  |  | (303,417 | ) |  | (341,301 | )
APS’s portion recorded as a regulatory (asset) liability | (711,059 | ) |  | (619,223 | ) |  | 156,575 |  |  | 213,621 |
Income tax expense (benefit) | (24,202 | ) |  | (23,663 | ) |  | 833 |  |  | 925 |
Accumulated other comprehensive loss | $ | 38,570 |  |  | $ | 37,224 |  |  | $ | 500 |  |  | $ | 369 |
Schedule of estimated amounts that will be amortized from accumulated other comprehensive loss and regulatory assets into net periodic benefit cost | The following table shows the estimated amounts that will be amortized from accumulated other comprehensive loss and regulatory assets and liabilities into net periodic benefit cost in 2017 (dollars in thousands):
| Pension |  | Other Benefits
Net actuarial loss | $ | 46,971 |  |  | $ | 5,181 |
Prior service cost (credit) | 81 |  |  | (37,842 | )
Total amounts estimated to be amortized from accumulated other comprehensive loss (gain) and regulatory assets (liabilities) in 2017 | $ | 47,052 |  |  | $ | (32,661 | )
Schedule of weighted-average assumptions used for both the pension and other benefits to determine benefit obligations and net periodic benefit costs | The following table shows the weighted-average assumptions used for both the pension and other benefits to determine benefit obligations and net periodic benefit costs:
| Benefit Obligations As of December 31, |  | Benefit Costs For the Years Ended December 31,
| 2016 |  | 2015 |  | 2016 |  | 2015 | 2014 |
|  |  |  |  |  |  |  | January - September | October - December |
Discount rate – pension | 4.08 | % |  | 4.37 | % |  | 4.37 | % |  | 4.02 | % | 4.88 | % | 4.88 | % |
Discount rate – other benefits | 4.17 | % |  | 4.52 | % |  | 4.52 | % |  | 4.14 | % | 5.10 | % | 4.41 | % |
Rate of compensation increase | 4.00 | % |  | 4.00 | % |  | 4.00 | % |  | 4.00 | % | 4.00 | % | 4.00 | % |
Expected long-term return on plan assets - pension | N/A |  |  | N/A |  |  | 6.90 | % |  | 6.90 | % | 6.90 | % | 6.90 | % |
Expected long-term return on plan assets - other benefits | N/A |  |  | N/A |  |  | 4.45 | % |  | 4.45 | % | 6.80 | % | 4.25 | % |
Initial healthcare cost trend rate (pre-65 participants) | 7.00 | % |  | 7.00 | % |  | 7.00 | % |  | 7.00 | % | 7.50 | % | 7.50 | % |
Initial healthcare cost trend rate (post-65 participants) | 5.00 | % |  | 5.00 | % |  | 5.00 | % |  | 5.00 | % | 7.50 | % | 5.00 | % |
Ultimate healthcare cost trend rate | 5.00 | % |  | 5.00 | % |  | 5.00 | % |  | 5.00 | % | 5.00 | % | 5.00 | % |
Number of years to ultimate trend rate (pre-65 participants) | 4 |  |  | 4 |  |  | 4 |  |  | 4 |  | 4 |  | 4 |  |
Number of years to ultimate trend rate (post-65 participants) | 0 |  |  | 0 |  |  | 0 |  |  | 0 |  | 4 |  | 0 |  |
Schedule of effects of one percentage point change in the assumed initial and ultimate health care cost trend rates | A one percentage point change in the assumed initial and ultimate healthcare cost trend rates would have the following effects (dollars in thousands):
| 1% Increase |  | 1% Decrease
Effect on other postretirement benefits expense, after consideration of amounts capitalized or billed to electric plant participants | $ | 8,430 |  |  | $ | (5,455 | )
Effect on service and interest cost components of net periodic other postretirement benefit costs | 8,440 |  |  | (6,527 | )
Effect on the accumulated other postretirement benefit obligation | 108,046 |  |  | (86,651 | )
Schedule of fair value of pension plan and other postretirement benefit plan assets, by asset category | The fair value of Pinnacle West’s pension plan and other postretirement benefit plan assets at December 31, 2015, by asset category, are as follows (dollars in thousands):
| Quoted Prices in Active Markets for Identical Assets (Level 1) |  | Significant Other Observable Inputs (Level 2) |  | Other (a) |  | Balance at December 31, 2015
Pension Plan: |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents | $ | 1,893 |  |  | $ | — |  |  | $ | — |  |  | $ | 1,893 |
Fixed Income Securities: |  |  |  |  |  |  |  |  |  |
Corporate | — |  |  | 1,108,736 |  |  | — |  |  | 1,108,736 |
U.S. Treasury | 274,778 |  |  | — |  |  | — |  |  | 274,778 |
Other (b) | — |  |  | 113,008 |  |  | — |  |  | 113,008 |
Common stock equities (c) | 247,701 |  |  | — |  |  | — |  |  | 247,701 |
Mutual funds - International equities | 116,307 |  |  | — |  |  | — |  |  | 116,307 |
Common and collective trusts: |  |  |  |  |  |  |
Equities | — |  |  | — |  |  | 315,989 |  |  | 315,989 |
Real Estate | — |  |  | — |  |  | 150,359 |  |  | 150,359 |
Partnerships | — |  |  | — |  |  | 169,937 |  |  | 169,937 |
Short-term investments and other (d) | — |  |  | — |  |  | 44,066 |  |  | 44,066 |
Total | $ | 640,679 |  |  | $ | 1,221,744 |  |  | $ | 680,351 |  |  | $ | 2,542,774 |
Other Benefits: |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents | $ | 240 |  |  | $ | — |  |  | $ | — |  |  | $ | 240 |
Fixed Income Securities: |  |  |  |  |  |  |  |  |  |
Corporate | — |  |  | 217,026 |  |  | — |  |  | 217,026 |
U.S. Treasury | 131,435 |  |  | — |  |  | — |  |  | 131,435 |
Other (b) | — |  |  | 31,106 |  |  | — |  |  | 31,106 |
Common stock equities (c) | 265,583 |  |  | — |  |  | — |  |  | 265,583 |
Mutual funds - International equities | 52,568 |  |  | — |  |  | — |  |  | 52,568 |
Common and collective trusts: |  |  |  |  |  |  |
Equities | — |  |  | — |  |  | 110,055 |  |  | 110,055 |
Real Estate | — |  |  | — |  |  | 13,512 |  |  | 13,512 |
Short-term investments and other (d) | — |  |  | — |  |  | 11,492 |  |  | 11,492 |
Total | $ | 449,826 |  |  | $ | 248,132 |  |  | $ | 135,059 |  |  | $ | 833,017 |
(a) | These investments primarily represent assets valued using net asset value as a practical expedient, and have not been classified in the fair value hierarchy.
(b) | This category consists primarily of debt securities issued by municipalities.
(c) | This category primarily consists of US common stock equities.
(d) | This category includes plan receivables and payables.
The fair value of Pinnacle West’s pension plan and other postretirement benefit plan assets at December 31, 2016, by asset category, are as follows (dollars in thousands):
| Quoted Prices in Active Markets for Identical Assets (Level 1) |  | Significant Other Observable Inputs (Level 2) |  | Other (a) |  | Balance at December 31, 2016
Pension Plan: |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents | $ | 13,995 |  |  | $ | — |  |  | $ | — |  |  | $ | 13,995 |
Fixed income securities: |  |  |  |  |  |  |  |  |  |
Corporate | — |  |  | 1,210,453 |  |  | — |  |  | 1,210,453 |
U.S. Treasury | 112,583 |  |  | — |  |  | — |  |  | 112,583 |
Other (b) | — |  |  | 102,170 |  |  | — |  |  | 102,170 |
Common stock equities (c) | 235,109 |  |  | — |  |  | — |  |  | 235,109 |
Mutual funds (d) | 251,506 |  |  | — |  |  | — |  |  | 251,506 |
Common and collective trusts: |  |  |  |  |  |  |
Equities | — |  |  | — |  |  | 266,840 |  |  | 266,840 |
Real estate | — |  |  | — |  |  | 161,449 |  |  | 161,449 |
Partnerships | — |  |  | — |  |  | 208,915 |  |  | 208,915 |
Short-term investments and other (e) | — |  |  | — |  |  | 112,337 |  |  | 112,337 |
Total | $ | 613,193 |  |  | $ | 1,312,623 |  |  | $ | 749,541 |  |  | $ | 2,675,357 |
Other Benefits: |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents | $ | 304 |  |  | $ | — |  |  | $ | — |  |  | $ | 304 |
Fixed income securities: |  |  |  |  |  |  |  |  |  |
Corporate | — |  |  | 268,193 |  |  | — |  |  | 268,193 |
U.S. Treasury | 145,255 |  |  | — |  |  | — |  |  | 145,255 |
Other (b) | — |  |  | 34,506 |  |  | — |  |  | 34,506 |
Common stock equities (c) | 243,741 |  |  | — |  |  | — |  |  | 243,741 |
Mutual funds (d) | 67,418 |  |  | — |  |  | — |  |  | 67,418 |
Common and collective trusts: |  |  |  |  |  |  |  |  |  |
Equities | — |  |  | — |  |  | 95,814 |  |  | 95,814 |
Real estate | — |  |  | — |  |  | 14,509 |  |  | 14,509 |
Partnerships | — |  |  | — |  |  | 3,060 |  |  | 3,060 |
Short-term investments and other (e) | — |  |  | — |  |  | 9,851 |  |  | 9,851 |
Total | $ | 456,718 |  |  | $ | 302,699 |  |  | $ | 123,234 |  |  | $ | 882,651 |
(a) | These investments primarily represent assets valued using net asset value as a practical expedient, and have not been classified in the fair value hierarchy.
(b) | This category consists primarily of debt securities issued by municipalities.
(c) | This category primarily consists of US common stock equities.
(d) | These funds invest in US and international common stock equities.
(e) | This category includes plan receivables and payables.
Schedule of estimated future benefit payments, which reflect estimated future employee service, for the next five years and the succeeding five years thereafter | Benefit payments, which reflect estimated future employee service, for the next five years and the succeeding five years thereafter, are estimated to be as follows (dollars in thousands):
Year |  | Pension |  | Other Benefits
2017 |  | $ | 172,859 |  |  | $ | 31,126 |
2018 |  | 173,232 |  |  | 33,795 |
2019 |  | 182,944 |  |  | 36,195 |
2020 |  | 191,037 |  |  | 37,998 |
2021 |  | 196,292 |  |  | 39,368 |
Years 2022-2026 |  | 1,049,149 |  |  | 201,944 |

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