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Changes in Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 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 | $ 1,509 | $ 1,573 | 1,705 | 2,602
Balance at end of period | 5,277,607 | 4,992,135 | 5,277,607 | 4,992,135
AOCI Including Portion Attributable to Noncontrolling Interest |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Balance at beginning of period | (43,626) | (43,719) | (43,822) | (44,748)
Balance at end of period | (42,117) | (42,146) | (42,117) | (42,146)
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 | 9 | (29) | (754) | (595)
Amounts reclassified from accumulated other comprehensive loss | 710 | 798 | 2,480 | 2,564
Total other comprehensive income | 719 | 769 | 1,726 | 1,969
Accumulated Defined Benefit Plans Adjustment Including Portion Attributable to Noncontrolling Interest |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
OCI (loss) before reclassifications | 0 | 0 | (2,157) | (1,585)
Amounts reclassified from accumulated other comprehensive loss | 790 | 804 | 2,136 | 2,218
Total other comprehensive income | 790 | 804 | (21) | 633
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 | 1,496 | 1,568 | 1,807 | 2,737
Balance at end of period | 5,373,351 | 5,085,440 | 5,373,351 | 5,085,440
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 | (25,112) | (25,928) | (25,423) | (27,097)
Balance at end of period | (23,616) | (24,360) | (23,616) | (24,360)
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 | 9 | (29) | (754) | (595)
Amounts reclassified from accumulated other comprehensive loss | 710 | 798 | 2,480 | 2,564
Total other comprehensive income | 719 | 769 | 1,726 | 1,969
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] |  |  |  |
OCI (loss) before reclassifications | 0 | 0 | (2,121) | (1,521)
Amounts reclassified from accumulated other comprehensive loss | 777 | 799 | 2,202 | 2,289
Total other comprehensive income | $ 777 | $ 799 | $ 81 | $ 768

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