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Defined Benefits (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Pension Plan [Member] | U.S.    
Net Periodic Defined Benefit Costs (Credits) (Details) [Abstract]    
Service cost $ 13 $ 16
Interest cost 41 39
Expected return on plan assets (61) (62)
Amortization of: [Abstract]    
Prior service cost 2 2
Actuarial loss 13 22
Net Periodic Defined Benefit Costs (Credits) Prior To Settlements 8 17
Settlements 1 0
Net periodic defined benefit costs (credits) 9 17
Pension Plan [Member] | U.K.    
Net Periodic Defined Benefit Costs (Credits) (Details) [Abstract]    
Service cost 17 21
Interest cost 47 47
Expected return on plan assets (148) (150)
Amortization of: [Abstract]    
Prior service cost 0 0
Actuarial loss 24 39
Net Periodic Defined Benefit Costs (Credits) Prior To Settlements (60) (43)
Settlements 0 0
Net periodic defined benefit costs (credits) (60) (43)
Other Postretirement Benefits Plan [Member]    
Net Periodic Defined Benefit Costs (Credits) (Details) [Abstract]    
Service cost 1 1
Interest cost 6 3
Expected return on plan assets (5) (4)
Amortization of: [Abstract]    
Prior service cost 0 (1)
Net periodic defined benefit costs (credits) 2 (1)
PPL Electric Utilities Corp [Member] | PPL Services [Member]    
Net Periodic Defined Benefit Costs Allocated to Subsidiary by Sponsor (Numeric) [Abstract]    
Costs allocated to subsidiary by plan sponsors 3 4
LG And E And KU Energy LLC [Member] | Pension Plan [Member]    
Net Periodic Defined Benefit Costs (Credits) (Details) [Abstract]    
Service cost 6 7
Interest cost 16 16
Expected return on plan assets (25) (26)
Amortization of: [Abstract]    
Prior service cost 2 2
Actuarial loss $ 4 $ 10
Regulatory Asset Amortization Period 15 years 15 years
Net periodic defined benefit costs (credits) $ 3 $ 9
Deferred recovery of the difference between pension costs calculated with pension accounting policy and pension cost using 15 year amortization period   4
LG And E And KU Energy LLC [Member] | Other Postretirement Benefits Plan [Member]    
Net Periodic Defined Benefit Costs (Credits) (Details) [Abstract]    
Service cost 1 1
Interest cost 2 2
Expected return on plan assets (2) (2)
Amortization of: [Abstract]    
Net periodic defined benefit costs (credits) 1 1
Louisville Gas And Electric Co [Member] | LKE [Member]    
Net Periodic Defined Benefit Costs Allocated to Subsidiary by Sponsor (Numeric) [Abstract]    
Costs allocated to subsidiary by plan sponsors 1 2
Louisville Gas And Electric Co [Member] | Pension Plan [Member]    
Net Periodic Defined Benefit Costs (Credits) (Details) [Abstract]    
Interest cost 3 3
Expected return on plan assets (6) (5)
Amortization of: [Abstract]    
Prior service cost 1 1
Actuarial loss $ 2 $ 2
Regulatory Asset Amortization Period 15 years 15 years
Net periodic defined benefit costs (credits) $ 0 $ 1
Deferred recovery of the difference between pension costs calculated with pension accounting policy and pension cost using 15 year amortization period   1
Kentucky Utilities Co [Member] | LKE [Member]    
Net Periodic Defined Benefit Costs Allocated to Subsidiary by Sponsor (Numeric) [Abstract]    
Costs allocated to subsidiary by plan sponsors $ 0 $ 1