Retirement and Postemployment Benefits (Weighted-Average Assumptions, Cost Trend Rates and Funded Status) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Pension Plan [Member] | U.S. [Member]
Weighted Average Assumptions Used in the Valuation of the Benefit Obligations (Details) [Abstract]
Benefit obligations valuation discount rate	3.15%	2.92%
Benefit obligations valuation rate of compensation increase	3.76%	3.76%
Weighted Average Assumptions Used to Determine the Net Periodic Benefit Costs (Details) [Abstract]
Net periodic benefit costs discount rate	2.92%	3.64%	4.35%
Net periodic benefit costs rate of compensation increase	3.76%	3.79%	3.79%
Net periodic benefit costs expected return on plan assets	7.25%	7.25%	7.25%
Assumed Health Care Cost Trend Rates (Details) [Abstract]
Health care cost trend rate assumed for next year, obligations	6.25%	6.50%	6.60%
Health care cost trend rate assumed for next year, cost	6.50%	6.60%	6.60%
Rate to which the cost trend rate is assumed to decline (the ultimate trend rate), obligations	5.00%	5.00%	5.00%
Rate to which the cost trend rate is assumed to decline (the ultimate trend rate), cost	5.00%	5.00%	5.00%
Year that the rate reaches the ultimate trend rate, obligations	2027	2027	2024
Year that the rate reaches the ultimate trend rate, cost	2027	2024	2023
Change in Benefit Obligation [Roll Forward]
Benefit Obligation, beginning of period	$ 4,251	$ 4,146
Service cost	56	56	$ 50
Interest cost	121	146	164
Participant contributions	0	0
Plan Amendments	2	2
Actuarial (gain) loss	(88)	256
Settlements	(106)	(114)
Gross benefits paid	(247)	(241)
Benefit Obligation, end of period	3,989	4,251	4,146
Change in Plan Assets [Roll Forward]
Balance at beginning of period	4,068	3,585
Actual return on plan assets	125	723
Employer contributions	47	115
Participant contributions	0	0
Settlements	(106)	(114)
Gross benefits paid	(247)	(241)
Balance at end of period	3,887	4,068	$ 3,585
Funded Status, end of period	(102)	(183)
Amounts recognized in the Balance Sheets consist of: [Abstract]
Noncurrent asset	91	24
Current liability	(10)	(18)
Noncurrent liability	(183)	(189)
Net amount recognized, end of period	(102)	(183)
Amounts recognized in AOCI and regulatory assets/liabilities (pre-tax): [Abstract]
Prior service cost (credit)	22	27
Net actuarial (gain) loss	626	695
Total	648	722
Total accumulated benefit obligation for defined benefit pension plans	3,786	4,024
Changes in Plan Assets and Benefit Obligations Recognized in AOCI and Regulatory Assets/Liabilities by Type (Details) [Abstract]
AOCI	239	270
Regulatory assets/liabilities	409	452
Total	648	722
Pension Plans Where the Projected or Accumulated Benefit Obligation Exceed the Fair Value of Plan Assets (Details) [Abstract]
Projected benefit obligations	193	1,875
Fair value of plan assets where the projected benefit obligations exceed the value of plan assets	0	1,668
Accumulated benefit obligation	177	184
Fair value of plan assets where the accumulated benefit obligations exceed the value of plan assets	$ 0	$ 0
Other Postretirement Benefits Plan [Member]
Weighted Average Assumptions Used in the Valuation of the Benefit Obligations (Details) [Abstract]
Benefit obligations valuation discount rate	3.13%	2.84%
Benefit obligations valuation rate of compensation increase	3.77%	3.75%
Weighted Average Assumptions Used to Determine the Net Periodic Benefit Costs (Details) [Abstract]
Net periodic benefit costs discount rate	2.84%	3.60%	4.31%
Net periodic benefit costs rate of compensation increase	3.75%	3.76%	3.76%
Net periodic benefit costs expected return on plan assets	6.48%	6.44%	6.46%
Change in Benefit Obligation [Roll Forward]
Benefit Obligation, beginning of period	$ 573	$ 557
Service cost	6	6	$ 6
Interest cost	16	19	22
Participant contributions	14	15
Plan Amendments	0	5
Actuarial (gain) loss	(50)	29
Settlements	0	0
Gross benefits paid	(55)	(58)
Benefit Obligation, end of period	504	573	557
Change in Plan Assets [Roll Forward]
Balance at beginning of period	367	340
Actual return on plan assets	25	56
Employer contributions	18	18
Participant contributions	11	11
Settlements	0	0
Gross benefits paid	(54)	(58)
Balance at end of period	367	367	$ 340
Funded Status, end of period	(137)	(206)
Amounts recognized in the Balance Sheets consist of: [Abstract]
Noncurrent asset	0	0
Current liability	(15)	(22)
Noncurrent liability	(122)	(184)
Net amount recognized, end of period	(137)	(206)
Amounts recognized in AOCI and regulatory assets/liabilities (pre-tax): [Abstract]
Prior service cost (credit)	12	14
Net actuarial (gain) loss	(51)	0
Total	(39)	14
Changes in Plan Assets and Benefit Obligations Recognized in AOCI and Regulatory Assets/Liabilities by Type (Details) [Abstract]
AOCI	(2)	10
Regulatory assets/liabilities	(37)	4
Total	(39)	14
PPL Electric Utilities Corp [Member]
Amounts recognized in the Balance Sheets consist of: [Abstract]
Noncurrent asset	50	12
PPL Electric Utilities Corp [Member] | Pension Plan [Member] | U.S. [Member] | PPL Services Funded Status Allocation [Member]
Change in Plan Assets [Roll Forward]
Funded Status, end of period	42	4
PPL Electric Utilities Corp [Member] | Other Postretirement Benefits Plan [Member] | PPL Services Funded Status Allocation [Member]
Change in Plan Assets [Roll Forward]
Funded Status, end of period	$ (78)	$ (99)
Louisville Gas And Electric Co [Member] | Pension Plan [Member] | U.S. [Member]
Weighted Average Assumptions Used to Determine the Net Periodic Benefit Costs (Details) [Abstract]
Net periodic benefit costs discount rate	0.00%	0.00%	4.33%
Net periodic benefit costs expected return on plan assets	0.00%	0.00%	7.25%
Change in Benefit Obligation [Roll Forward]
Service cost			$ 1
Interest cost			$ 11
Louisville Gas And Electric Co [Member] | Pension Plan [Member] | U.S. [Member] | LKE Funded Status Allocation [Member]
Change in Plan Assets [Roll Forward]
Funded Status, end of period	$ 85	$ 78
Louisville Gas And Electric Co [Member] | Other Postretirement Benefits Plan [Member] | LKE Funded Status Allocation [Member]
Change in Plan Assets [Roll Forward]
Funded Status, end of period	(51)	(68)
Kentucky Utilities Co [Member] | Pension Plan [Member] | U.S. [Member] | LKE Funded Status Allocation [Member]
Change in Plan Assets [Roll Forward]
Funded Status, end of period	75	62
Kentucky Utilities Co [Member] | Other Postretirement Benefits Plan [Member] | LKE Funded Status Allocation [Member]
Change in Plan Assets [Roll Forward]
Funded Status, end of period	$ (6)	$ (16)