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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) (Parenthetical) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
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Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Tax effect of foreign currency translation adjustments arising during the period | $ 0 | $ 0 | $ (1) | $ (2)
Tax effect of qualifying derivatives arising during the period | 5 | 22 | 7 | 7
Tax effect of defined benefit plans - net actuarial gain (loss) arising during period | 7 | (1) | 7 | (1)
Tax effect of qualifying derivatives reclassified from accumulated other comprehensive income (loss) | (7) | (21) | (7) | (2)
Tax effect of equity investees' other comprehensive income (loss) reclassified from accumulated other comprehensive income (loss) | 0 | 0 | 0 | 0
Tax effect of prior service costs reclassified from accumulated other comprehensive income (loss) | 0 | 0 | 0 | 0
Tax effect of net actuarial (gain) loss reclassified from accumulated other comprehensive income (loss) | (9) | (8) | (18) | (17)
LG And E And KU Energy LLC [Member] |  |  |  |
Tax effect of defined benefit plans - net actuarial gain (loss) arising during period | 7 | (1) | 7 | (1)
Tax effect of equity investees' other comprehensive income (loss) reclassified from accumulated other comprehensive income (loss) | 0 | 0 | 0 | 0
Tax effect of prior service costs reclassified from accumulated other comprehensive income (loss) | 0 | 0 | 0 | 0
Tax effect of net actuarial (gain) loss reclassified from accumulated other comprehensive income (loss) | $ (1) | $ (1) | $ (2) | $ (1)

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- Definition Amount of tax expense (benefit) related to (increase) decrease in the value of the projected benefit obligation related to a change in an actuarial assumption and increase (decrease) in the value of the plan assets resulting from experience different from that assumed, that has not been recognized in net periodic benefit (cost) credit. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=66004124&loc=d3e640-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (i-k) -URI http://asc.fasb.org/extlink&oid=66004124&loc=SL7669646-108580 + Details
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- Definition Amount of tax expense (benefit), before reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 45 -Paragraph 20 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=64808268&loc=d3e32211-110900 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=66004124&loc=d3e640-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66004124&loc=SL7669646-108580 + Details
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