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Changes in Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 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 (loss) | $ (763) | $ 51 | 196 | 1,029
Balance at end of period | 4,990,077 | 4,719,183 | 4,990,077 | 4,719,183
AOCI Including Portion Attributable to Noncontrolling Interest |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Balance at beginning of period | (42,863) | (43,770) | (43,822) | (44,748)
Balance at end of period | (43,626) | (43,719) | (43,626) | (43,719)
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 | 7 | 128 | (763) | (566)
Amounts reclassified from accumulated other comprehensive loss | 564 | 624 | 1,771 | 1,766
Total other comprehensive income (loss) | 571 | 752 | 1,008 | 1,200
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 | (2,157) | (1,585) | (2,157) | (1,585)
Amounts reclassified from accumulated other comprehensive loss | 823 | 884 | 1,345 | 1,414
Total other comprehensive income (loss) | (1,334) | (701) | (812) | (171)
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 (loss) | (737) | 110 | 311 | 1,169
Balance at end of period | 5,082,726 | 4,809,779 | 5,082,726 | 4,809,779
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 | (24,375) | (26,038) | (25,423) | (27,097)
Balance at end of period | (25,112) | (25,928) | (25,112) | (25,928)
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 | 7 | 128 | (763) | (566)
Amounts reclassified from accumulated other comprehensive loss | 564 | 624 | 1,771 | 1,766
Total other comprehensive income (loss) | 571 | 752 | 1,008 | 1,200
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 | (2,121) | (1,521) | (2,121) | (1,521)
Amounts reclassified from accumulated other comprehensive loss | 813 | 879 | 1,424 | 1,490
Total other comprehensive income (loss) | $ (1,308) | $ (642) | $ (697) | $ (31)

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