XML 52 R27.htm IDEA: XBRL DOCUMENT
v3.10.0.1

Long-Term Debt and Liquidity Matters (Tables) | 6 Months Ended
--- | ---
Jun. 30, 2018
Debt Disclosure [Abstract] |
Schedule of estimated fair value of long-term debt, including current maturities | The following table presents the estimated fair value of our long-term debt, including current maturities (dollars in thousands):
| As of June 30, 2018 |  | As of December 31, 2017
| Carrying Amount |  | Fair Value |  | Carrying Amount |  | Fair Value
Pinnacle West | $ | 298,483 |  |  | $ | 292,767 |  |  | $ | 298,421 |  |  | $ | 298,608 |
APS | 4,493,042 |  |  | 4,660,281 |  |  | 4,573,292 |  |  | 5,006,348 |
Total | $ | 4,791,525 |  |  | $ | 4,953,048 |  |  | $ | 4,871,713 |  |  | $ | 5,304,956 |

X
- References No definition available. + Details
Name: | us-gaap_DebtDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the fair value of financial instruments, including financial assets and financial liabilities, and the measurements of those instruments, assets, and liabilities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=109250915&loc=d3e13467-108611 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
Name: | us-gaap_FairValueByBalanceSheetGroupingTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration