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Income and Other Taxes (Income Tax Expense and Reconciliation of Income Tax Expense) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Income Tax Expense (Benefit)      
Current - Federal $ (14) $ (26) $ 18
Current - State 21 25 26
Current - Foreign 80 89 152
Total Current Expense (Benefit) 87 88 196
Deferred - Federal 385 699 299
Deferred - State 89 68 120
Deferred - Foreign 86 41 96
Total Deferred Expense (Benefit), excluding operating loss carry forwards 560 808 515
Investment tax credit, net - Federal (3) (4) (5)
Tax expense (benefit) of operating loss carryforwards [Abstract]      
Deferred - Federal [1] 25 (396) 8
Deferred - State (21) (31) (22)
Total Tax Expense (Benefit) of Operating Loss Carryforwards 4 (427) (14)
Total income tax from continuing operations 648 465 692
Income tax expense (benefit) from continuing operations [Abstract]      
Total income tax expense - Federal 393 273 320
Total income tax expense - State 89 62 124
Total income tax expense - Foreign 166 130 248
Total income tax from continuing operations 648 465 692
Discontinued operations 0 (30) 198
Stock-based compensation recorded to Additional Paid-in Capital 0 0 (4)
Stock-based compensation recorded to Earnings Reinvested (7) 0 0
Other comprehensive income (6) (2) (190)
Valuation allowance on state deferred taxes recorded to other comprehensive income 1 (4) 0
Total income tax expense (benefits) excluded from incomes taxes from continuing operations (12) (36) 4
Reconciliation of Income Tax Expense      
Federal income tax on Income (Loss) from Continuing Operations Before Income Taxes at statutory tax rate - 35% $ 893 $ 724 $ 745
Federal statutory rate 35.00% 35.00% 35.00%
Increase (decrease) due to:      
State income taxes, net of federal income tax benefit $ 46 $ 31 $ 28
Valuation allowance adjustments [2] 16 24 55
Income Tax Reconciliation Stock Based Compensation (10) [3] 0 0
Impact of lower U.K. income tax rates [4] (177) (176) (180)
U.S. income tax on foreign earnings - net of foreign tax credit [5] (42) 8 63
Federal and state tax reserve adjustments 0 [6] (22) (1) [6]
Impact of the United Kingdom Finance Acts on deferred tax balances [4] (49) (91) (1)
Depreciation not normalized (10) (5) (7)
Interest benefit on United Kingdom financing entities (17) (20) (5)
Other (2) (8) (5)
Total increase (decrease) (245) (259) (53)
Total income tax from continuing operations $ 648 $ 465 $ 692
Effective income tax rate 25.40% 22.50% 32.50%
Expense related to increased Pennsylvania net operating loss carryforwards expected to be unutilized   $ 12  
Expense related to federal tax credit carryforwards that are expected to expire as a result of future taxable earnings   12  
Adjustment to valuation allowance on deferred tax assets due to spinoff announcement     $ 50
Future UK Statutory Income Tax Rate Revised In Current Year 18.00%    
United Kingdom statutory income tax rate in effect during period prior to a change 20.00%    
U.K. statutory income tax rate reduction in year one 19.00%    
Foreign Tax Rate Reduction Approved Current Year For Future Year Five 18.00%    
U.K. statutory income tax rate reduction in year four 17.00%    
Expense from increased taxable dividends     47
Benefit recorded in continuing operations related to the settlement of the IRS audit for tax years 1998-2011   12  
Taxes, other than income      
State gross receipts $ 100 89 [7] 102
Foreign property 135 148 157
Domestic property and other 66 62 58
Total 301 299 317
Previously recorded reserves   17  
PPL Electric Utilities Corp [Member]      
Income Tax Expense (Benefit)      
Current - Federal (29) (80) 60
Current - State 19 23 15
Total Current Expense (Benefit) (10) (57) 75
Deferred - Federal 193 287 70
Deferred - State 29 12 16
Total Deferred Expense (Benefit), excluding operating loss carry forwards 222 299 86
Investment tax credit, net - Federal 0 0 (1)
Tax expense (benefit) of operating loss carryforwards [Abstract]      
Deferred - Federal 0 (75) 0
Deferred - State 0 (3) 0
Total Tax Expense (Benefit) of Operating Loss Carryforwards 0 (78) 0
Total income tax from continuing operations 212 164 160
Income tax expense (benefit) from continuing operations [Abstract]      
Total income tax expense - Federal 164 132 129
Total income tax expense - State 48 32 31
Total income tax from continuing operations 212 164 160
Reconciliation of Income Tax Expense      
Federal income tax on Income (Loss) from Continuing Operations Before Income Taxes at statutory tax rate - 35% $ 193 $ 146 $ 148
Federal statutory rate 35.00% 35.00% 35.00%
Increase (decrease) due to:      
State income taxes, net of federal income tax benefit $ 36 $ 25 $ 22
Income Tax Reconciliation Stock Based Compensation (6) [8] 0 0
Depreciation not normalized (8) (4) (6)
Other (3) (3) (4)
Total increase (decrease) 19 18 12
Total income tax from continuing operations $ 212 $ 164 $ 160
Effective income tax rate 38.40% 39.40% 37.80%
Taxes, other than income      
State gross receipts $ 100 $ 89 $ 102
Domestic property and other 5 5 5
Total 105 94 107
Previously recorded reserves   17  
LG And E And KU Energy LLC [Member]      
Income Tax Expense (Benefit)      
Current - Federal (36) 2 (247)
Current - State 1 1 8
Total Current Expense (Benefit) (35) 3 (239)
Deferred - Federal 248 405 437
Deferred - State 38 32 23
Total Deferred Expense (Benefit), excluding operating loss carry forwards 286 437 460
Investment tax credit, net - Federal (3) (3) (4)
Tax expense (benefit) of operating loss carryforwards [Abstract]      
Deferred - Federal 10 (198) (8)
Deferred - State (1) 0 0
Total Tax Expense (Benefit) of Operating Loss Carryforwards 9 (198) (8)
Total income tax from continuing operations 257 239 209
Income tax expense (benefit) from continuing operations [Abstract]      
Total income tax expense - Federal 219 206 178
Total income tax expense - State 38 33 31
Total income tax from continuing operations 257 239 209
Discontinued operations 1 1 1
Other comprehensive income (16) (1) (36)
Reconciliation of Income Tax Expense      
Federal income tax on Income (Loss) from Continuing Operations Before Income Taxes at statutory tax rate - 35% $ 240 $ 211 $ 194
Federal statutory rate 35.00% 35.00% 35.00%
Increase (decrease) due to:      
State income taxes, net of federal income tax benefit $ 25 $ 22 $ 20
Valuation allowance adjustments 0 12 [9] 0
Income Tax Reconciliation Stock Based Compensation (3) [10] 0 0
Amortization of investment tax credit (3) (3) (4)
Other (2) (3) (1)
Total increase (decrease) 17 28 15
Total income tax from continuing operations $ 257 $ 239 $ 209
Effective income tax rate 37.50% 39.60% 37.80%
Taxes, other than income      
Domestic property and other $ 62 $ 57 $ 52
Total 62 57 52
Louisville Gas And Electric Co [Member]      
Income Tax Expense (Benefit)      
Current - Federal (22) (15) (25)
Current - State 1 3 10
Total Current Expense (Benefit) (21) (12) (15)
Deferred - Federal 134 190 114
Deferred - State 18 13 6
Total Deferred Expense (Benefit), excluding operating loss carry forwards 152 203 120
Investment tax credit, net - Federal (1) (1) (2)
Tax expense (benefit) of operating loss carryforwards [Abstract]      
Deferred - Federal (4) (76) 0
Total Tax Expense (Benefit) of Operating Loss Carryforwards (4) (76) 0
Total income tax from continuing operations 126 114 103
Income tax expense (benefit) from continuing operations [Abstract]      
Total income tax expense - Federal 107 98 87
Total income tax expense - State 19 16 16
Total income tax from continuing operations 126 114 103
Reconciliation of Income Tax Expense      
Federal income tax on Income (Loss) from Continuing Operations Before Income Taxes at statutory tax rate - 35% $ 115 $ 105 $ 95
Federal statutory rate 35.00% 35.00% 35.00%
Increase (decrease) due to:      
State income taxes, net of federal income tax benefit $ 12 $ 11 $ 10
Amortization of investment tax credit (1) (1) (2)
Other 0 (1) 0
Total increase (decrease) 11 9 8
Total income tax from continuing operations $ 126 $ 114 $ 103
Effective income tax rate 38.30% 38.10% 37.90%
Taxes, other than income      
Domestic property and other $ 32 $ 28 $ 25
Total 32 28 25
Kentucky Utilities Co [Member]      
Income Tax Expense (Benefit)      
Current - Federal 31 (21) (95)
Current - State 5 1 6
Total Current Expense (Benefit) 36 (20) (89)
Deferred - Federal 131 240 212
Deferred - State 19 19 14
Total Deferred Expense (Benefit), excluding operating loss carry forwards 150 259 226
Investment tax credit, net - Federal (2) (2) (2)
Tax expense (benefit) of operating loss carryforwards [Abstract]      
Deferred - Federal (21) (97) 0
Total Tax Expense (Benefit) of Operating Loss Carryforwards (21) (97) 0
Total income tax from continuing operations 163 140 135
Income tax expense (benefit) from continuing operations [Abstract]      
Total income tax expense - Federal 139 120 115
Total income tax expense - State 24 20 20
Total income tax from continuing operations 163 140 135
Other comprehensive income (1) (1) (1)
Reconciliation of Income Tax Expense      
Federal income tax on Income (Loss) from Continuing Operations Before Income Taxes at statutory tax rate - 35% $ 150 $ 131 $ 124
Federal statutory rate 35.00% 35.00% 35.00%
Increase (decrease) due to:      
State income taxes, net of federal income tax benefit $ 16 $ 13 $ 13
Amortization of investment tax credit (2) (2) (2)
Other (1) (2) 0
Total increase (decrease) 13 9 11
Total income tax from continuing operations $ 163 $ 140 $ 135
Effective income tax rate 38.10% 37.40% 38.00%
Taxes, other than income      
Domestic property and other $ 30 $ 29 $ 27
Total $ 30 $ 29 $ 27
[1] Increase in Federal loss carryforwards for 2015 primarily relates to the extension of bonus depreciation and the impact of bonus depreciation related to provision to return adjustments.
[2] During 2016, PPL recorded deferred tax expense for valuation allowances primarily related to increased Pennsylvania net operating loss carryforwards expected to be unutilized.During 2015, PPL recorded $24 million of deferred income tax expense related to deferred tax valuation allowances. PPL recorded state deferred income tax expense of $12 million primarily related to increased Pennsylvania net operating loss carryforwards expected to be unutilized and $12 million of federal deferred income tax expense primarily related to federal tax credit carryforwards that are expected to expire as a result of lower future taxable earnings due to the extension of bonus depreciation.As a result of the PPL Energy Supply spinoff announcement, PPL recorded $50 million of deferred income tax expense during 2014, to adjust the valuation allowance on deferred tax assets primarily for state net operating loss carryforwards that were previously supported by the future earnings of PPL Energy Supply. See Note 8 for additional information on the spinoff.
[3] During 2016, PPL recorded lower income tax expense related to the application of new stock-based compensation accounting guidance. See Note 1 for additional information.
[4] The U.K. Finance Act 2016, enacted in September 2016, reduces the U.K. statutory income tax rate effective April 1, 2020 from 18% to 17%. As a result, PPL reduced its net deferred tax liabilities and recognized a deferred tax benefit during 2016.The U.K. Finance Act 2015, enacted in November 2015, reduced the U.K. statutory income tax rate from 20% to 19% effective April 1, 2017 and from 19% to 18% effective April 1, 2020. As a result, PPL reduced its net deferred tax liabilities and recognized a deferred tax benefit during 2015, related to both rate decreases.
[5] During 2016, PPL recorded lower income taxes primarily attributable to foreign tax credit carryforwards, arising from a decision to amend prior year tax returns to claim foreign tax credits rather than deduct foreign taxes. This decision was prompted by changes to the Company's most recent business plan.During 2015, PPL recorded lower income taxes primarily attributable to a decrease in taxable dividends.During 2014, PPL recorded $47 million of income tax expense primarily attributable to taxable dividends.
[6] During 2015, PPL recorded a $12 million tax benefit related to the settlement of the IRS audit for the tax years 1998-2011.
[7] The decrease in 2015 was primarily due to the settlement of a 2011 gross receipts tax audit resulting in the reversal of $17 million of previously recognized reserves.
[8] During 2016, PPL recorded lower income tax expense related to the application of new stock-based compensation accounting guidance. See Note 1 for additional information.
[9] Represents a valuation allowance against tax credits expiring through 2020 that are more likely than not to expire before being utilized.
[10] During 2016, LKE recorded lower income tax expense related to the application of new stock-based compensation accounting guidance. See Note 1 for additional information.