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Changes in Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2017 | Mar. 31, 2016
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |
Balance at beginning of period | $ 4,935,912 | $ 4,719,457
Total other comprehensive income | 959 | 978
Balance at end of period | 4,965,940 | 4,740,413
AOCI Including Portion Attributable to Noncontrolling Interest |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |
Balance at beginning of period | (43,822) | (44,748)
Balance at end of period | (42,863) | (43,770)
Accumulated Net Gain (Loss) from Cash Flow Hedges Including Portion Attributable to Noncontrolling Interest |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |
OCI (loss) before reclassifications | (770) | (693)
Amounts reclassified from accumulated other comprehensive loss | 1,207 | 1,141
Total other comprehensive income | 437 | 448
Accumulated Defined Benefit Plans Adjustment Including Portion Attributable to Noncontrolling Interest |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |
Amounts reclassified from accumulated other comprehensive loss | 522 | 530
Total other comprehensive income | 522 | 530
Arizona Public Service Company |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |
Balance at beginning of period | 5,037,970 | 4,814,794
Total other comprehensive income | 1,048 | 1,059
Balance at end of period | 5,067,052 | 4,827,980
Arizona Public Service Company | AOCI Including Portion Attributable to Noncontrolling Interest |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |
Balance at beginning of period | (25,423) | (27,097)
Balance at end of period | (24,375) | (26,038)
Arizona Public Service Company | Accumulated Net Gain (Loss) from Cash Flow Hedges Including Portion Attributable to Noncontrolling Interest |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |
OCI (loss) before reclassifications | (770) | (693)
Amounts reclassified from accumulated other comprehensive loss | 1,207 | 1,141
Total other comprehensive income | 437 | 448
Arizona Public Service Company | Accumulated Defined Benefit Plans Adjustment Including Portion Attributable to Noncontrolling Interest |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |
Amounts reclassified from accumulated other comprehensive loss | 611 | 611
Total other comprehensive income | $ 611 | $ 611

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