XML 90 R65.htm IDEA: XBRL DOCUMENT
v3.10.0.1

Changes in Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Balance at beginning of period |  | $ (42,863) | $ 5,135,730 | $ 4,935,912
OCI (loss) before reclassifications | $ (5,928) | (2,150) | (6,024) | (2,920)
Amounts reclassified from accumulated other comprehensive loss | 1,645 | 1,387 | 2,954 | 3,116
Reclassification of income tax effect related to tax reform |  |  | (8,552) |
Balance at end of period | 5,159,434 | 4,990,077 | 5,159,434 | 4,990,077
Pension and Other Postretirement Benefits |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Balance at beginning of period | (49,494) | (38,548) | (42,440) | (39,070)
OCI (loss) before reclassifications | (5,928) | (2,157) | (5,928) | (2,157)
Amounts reclassified from accumulated other comprehensive loss | 1,189 | 823 | 2,089 | 1,345
Reclassification of income tax effect related to tax reform |  |  | (7,954) |
Balance at end of period | (54,233) | (39,882) | (54,233) | (39,882)
Derivative Instruments |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Balance at beginning of period | (2,847) | (4,315) | (2,562) | (4,752)
OCI (loss) before reclassifications | 0 | 7 | (96) | (763)
Amounts reclassified from accumulated other comprehensive loss | 456 | 564 | 865 | 1,771
Reclassification of income tax effect related to tax reform |  |  | (598) |
Balance at end of period | (2,391) | (3,744) | (2,391) | (3,744)
Accumulated Other Comprehensive Income (Loss) |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Balance at beginning of period | (52,341) |  | (45,002) | (43,822)
Reclassification of income tax effect related to tax reform |  |  | (8,552) |
Balance at end of period | (56,624) | (43,626) | (56,624) | (43,626)
APS |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Balance at beginning of period |  |  | 5,385,869 | 5,037,970
OCI (loss) before reclassifications | (5,790) | (2,114) | (5,886) | (2,884)
Amounts reclassified from accumulated other comprehensive loss | 1,482 | 1,377 | 2,748 | 3,195
Reclassification of income tax effect related to tax reform |  |  | (5,038) |
Balance at end of period | 5,412,930 | 5,082,726 | 5,412,930 | 5,082,726
APS | Pension and Other Postretirement Benefits |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Balance at beginning of period | (28,004) | (20,060) | (24,421) | (20,671)
OCI (loss) before reclassifications | (5,790) | (2,121) | (5,790) | (2,121)
Amounts reclassified from accumulated other comprehensive loss | 1,026 | 813 | 1,883 | 1,424
Reclassification of income tax effect related to tax reform |  |  | (4,440) |
Balance at end of period | (32,768) | (21,368) | (32,768) | (21,368)
APS | Derivative Instruments |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Balance at beginning of period | (2,847) | (4,315) | (2,562) | (4,752)
OCI (loss) before reclassifications | 0 | 7 | (96) | (763)
Amounts reclassified from accumulated other comprehensive loss | 456 | 564 | 865 | 1,771
Reclassification of income tax effect related to tax reform |  |  | (598) |
Balance at end of period | (2,391) | (3,744) | (2,391) | (3,744)
APS | Accumulated Other Comprehensive Income (Loss) |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Balance at beginning of period | (30,851) | (24,375) | (26,983) | (25,423)
Reclassification of income tax effect related to tax reform |  |  | (5,038) |
Balance at end of period | $ (35,159) | $ (25,112) | $ (35,159) | $ (25,112)

X
- Definition Tax Cuts And Jobs Act Of 2017, Reclassification From AOCI To Retained Earnings,Tax Effect + References No definition available. + Details
Name: | pnw_TaxCutsAndJobsActOf2017ReclassificationFromAOCIToRetainedEarningsTaxEffect
Namespace Prefix: | pnw_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount after tax, before reclassification adjustments of other comprehensive income (loss). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669686-108580 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 55 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=109228884&loc=d3e1436-108581 + Details
Name: | us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount after tax of reclassification adjustments of other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 17B -URI http://asc.fasb.org/extlink&oid=114867106&loc=SL34724394-108580 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669686-108580 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 55 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=109228884&loc=d3e1436-108581 + Details
Name: | us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
Name: | us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTaxAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of stockholders' equity (deficit), net of receivables from officers, directors, owners, and affiliates of the entity, attributable to both the parent and noncontrolling interests. Amount excludes temporary equity. Alternate caption for the concept is permanent equity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=108774443&loc=SL4568740-111683 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 55 -Paragraph 4I -URI http://asc.fasb.org/extlink&oid=84234705&loc=SL4590271-111686 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=108774443&loc=SL4568447-111683 + Details
Name: | us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | us-gaap_StatementEquityComponentsAxis=us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementEquityComponentsAxis=us-gaap_AccumulatedGainLossNetCashFlowHedgeParentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementEquityComponentsAxis=us-gaap_AccumulatedOtherComprehensiveIncomeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=pnw_ArizonaPublicServiceCompanyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |