CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) (Parenthetical) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Tax effect of foreign currency translation adjustments arising during the period	$ 0	$ 0	$ 1	$ 0
Tax effect of qualifying derivatives arising during the period	12	(3)	4	(7)
Other Comprehensive Income (Loss), Defined Benefit Plans, Gain (Loss) Arising During Period, Tax	5	2	6	4
Tax effect of qualifying derivatives reclassified from AOCI	(12)	3	(8)	3
Other Comprehensive (Income) Loss, Defined Benefit Plans, Prior Service Costs (Credit), Reclassification Adjustment from AOCI, Tax	(1)	(1)	(1)	(1)
Other Comprehensive (Income) Loss, Defined Benefit Plans, Net Actuarial Gain(Loss), Reclassification Adjustment from AOCI, Tax	(12)	(5)	(35)	(16)
LG And E And KU Energy LLC [Member]
Other Comprehensive Income (Loss), Defined Benefit Plans, Gain (Loss) Arising During Period, Tax	3	0	3	0
Other Comprehensive (Income) Loss, Defined Benefit Plans, Prior Service Costs (Credit), Reclassification Adjustment from AOCI, Tax	0	0	0	0
Other Comprehensive (Income) Loss, Defined Benefit Plans, Net Actuarial Gain(Loss), Reclassification Adjustment from AOCI, Tax	$ 2	$ 0	$ 3	$ 0

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.

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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.

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Amount of tax (expense) benefit of reclassification adjustment from accumulated other comprehensive (income) loss for prior service cost (credit) of defined benefit plan.

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Amount, before reclassification, of tax expense (benefit) for gain (loss) from derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness.

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Amount of tax expense (benefit) of reclassification adjustment from accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan.

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