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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (Unaudited) (Parenthetical) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Tax effect of foreign currency translation adjustments arising during the period $ 0 $ 6 $ (2) $ 1
Tax effect of available-for-sale securities arising during the period 0 (3) 0 (9)
Tax effect of qualifying derivatives arising during the period 22 (11) 7 (7)
Tax effect of defined benefit plans - prior service costs arising during period 0 4 0 4
Tax effect of defined benefit plans - net actuarial gain (loss) arising during period (1) (36) (1) (36)
Tax effect of available-for-sale securities reclassified from accumulated other comprehensive income (loss) 0 1 0 2
Tax effect of qualifying derivatives reclassified from accumulated other comprehensive income (loss) (21) (24) (2) (20)
Tax effect of equity investees' other comprehensive income (loss) reclassified from accumulated other comprehensive income (loss) 0 0 0 1
Tax effect of prior service costs reclassified from accumulated other comprehensive income (loss) 0 0 0 0
Tax effect of net actuarial loss reclassified from accumulated other comprehensive income (loss) (8) (12) (17) (25)
LG And E And KU Energy LLC [Member]        
Tax effect of defined benefit plans - net actuarial gain (loss) arising during period (1) 5 (1) 5
Tax effect of equity investees' other comprehensive income (loss) reclassified from accumulated other comprehensive income (loss) 0 0 0 1
Tax effect of prior service costs reclassified from accumulated other comprehensive income (loss) 0 0 0 0
Tax effect of net actuarial loss reclassified from accumulated other comprehensive income (loss) $ (1) $ (1) $ (1) $ (1)