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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Tax effect of foreign currency translation adjustments arising during the period | $ (1) | $ (4) | $ 1
Tax effect of available-for-sale securities arising during the period | 0 | 0 | (9)
Tax effect of qualifying derivatives arising during the period | 19 | (18) | 0
Tax effect of defined benefit plans - prior service costs arising during period | 0 | 2 | 6
Tax effect of defined benefit plans - net actuarial gain (loss) arising during period | 72 | 40 | 67
Tax effect of available-for-sale securities reclassified to net income | 0 | 0 | 2
Tax effect of qualifying derivatives reclassified to net income | (18) | 21 | (15)
Tax effect of equity investees' other comprehensive (income) loss reclassified to net income | 0 | 0 | 0
Tax effect of defined benefit plans - prior service costs reclassified to net income | (1) | (1) | 0
Tax effect of defined benefit plans - net actuarial (gain) loss reclassified to net income | (37) | (35) | (46)
LG And E And KU Energy LLC [Member] |  |  |
Tax effect of defined benefit plans - prior service costs arising during period | (1) | 0 | (2)
Tax effect of defined benefit plans - net actuarial gain (loss) arising during period | 13 | 18 | 2
Tax effect of equity investees' other comprehensive (income) loss reclassified to net income | 0 | 0 | 0
Tax effect of defined benefit plans - prior service costs reclassified to net income | 1 | 1 | 1
Tax effect of defined benefit plans - net actuarial (gain) loss reclassified to net income | $ 2 | $ 1 | $ 3

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- Definition Amount of tax expense (benefit) for (increase) decrease in value of benefit obligation for change in actuarial assumptions and increase (decrease) in value of plan assets from experience different from that assumed of defined benefit plan, 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=84228862&loc=d3e640-108580 + 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=84228862&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=84228862&loc=SL7669646-108580 + Details
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- Definition Amount of tax (expense) benefit of reclassification adjustment from accumulated other comprehensive (income) loss for prior service cost (credit) of defined benefit plan. + 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=84228862&loc=d3e640-108580 + Details
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- Definition Amount of tax expense (benefit) of reclassification adjustment from accumulated other comprehensive income of accumulated gain (loss) realized from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's deferred hedging gain (loss). + 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=84228862&loc=d3e640-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph c -URI http://asc.fasb.org/extlink&oid=84234895&loc=d3e41638-113959 + Details
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