Financing Activities (Credit Arrangements) (Details)
In Millions, unless otherwise specified |
3 Months Ended | 12 Months Ended | 3 Months Ended | 3 Months Ended | 3 Months Ended | 1 Months Ended | 3 Months Ended | 3 Months Ended | 3 Months Ended | 3 Months Ended | 3 Months Ended | 3 Months Ended | 1 Months Ended | 3 Months Ended | 3 Months Ended | 1 Months Ended | 3 Months Ended | 3 Months Ended | 3 Months Ended | 3 Months Ended | 3 Months Ended | 3 Months Ended | 1 Months Ended | 3 Months Ended | 3 Months Ended | 3 Months Ended | 1 Months Ended | 3 Months Ended | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Mar. 31, 2013
PPL WW [Member]
Syndicated Credit Facility [Member]
GBP (£)
|
Dec. 31, 2012
PPL WW [Member]
Syndicated Credit Facility [Member]
GBP (£)
|
Mar. 31, 2013
PPL WW [Member]
Syndicated Credit Facility [Member]
USD Denominated Borrowing [Member]
USD ($)
|
Dec. 31, 2012
PPL WW [Member]
Syndicated Credit Facility [Member]
USD Denominated Borrowing [Member]
USD ($)
|
Mar. 31, 2013
WPD South West [Member]
Syndicated Credit Facility [Member]
GBP (£)
|
Mar. 31, 2013
WPD East Midlands [Member]
Syndicated Credit Facility [Member]
GBP (£)
|
Mar. 31, 2013
WPD East Midlands [Member]
Syndicated Credit Facility [Member]
USD Denominated Borrowing [Member]
USD ($)
|
Mar. 31, 2013
WPD West Midlands [Member]
Syndicated Credit Facility [Member]
GBP (£)
|
Mar. 31, 2013
WPD [Member]
USD ($)
|
Mar. 31, 2013
WPD [Member]
GBP (£)
|
Dec. 31, 2012
WPD [Member]
GBP (£)
|
Mar. 31, 2013
WPD [Member]
Uncommitted Credit Facilities [Member]
GBP (£)
|
Dec. 31, 2012
WPD [Member]
Uncommitted Credit Facilities [Member]
GBP (£)
|
Mar. 31, 2013
PPL Energy Supply [Member]
USD ($)
|
Dec. 31, 2012
PPL Energy Supply [Member]
USD ($)
|
Mar. 31, 2013
PPL Energy Supply [Member]
Syndicated Credit Facility [Member]
USD ($)
|
Dec. 31, 2012
PPL Energy Supply [Member]
Syndicated Credit Facility [Member]
USD ($)
|
Mar. 31, 2013
PPL Energy Supply [Member]
Uncommitted Credit Facilities [Member]
USD ($)
|
Dec. 31, 2012
PPL Energy Supply [Member]
Uncommitted Credit Facilities [Member]
USD ($)
|
Feb. 28, 2013
PPL Energy Supply [Member]
Letter Of Credit Facility [Member]
|
Mar. 31, 2013
PPL Energy Supply [Member]
Letter Of Credit Facility [Member]
USD ($)
|
Dec. 31, 2012
PPL Energy Supply [Member]
Letter Of Credit Facility [Member]
USD ($)
|
Mar. 31, 2013
PPL Energy Supply [Member]
Facility Agreement [Member]
USD ($)
|
Mar. 31, 2013
PPL Energy Supply [Member]
Secured Trading Facility [Member]
USD ($)
Integer
|
Apr. 30, 2013
PPL Energy Supply [Member]
Subsequent To Period End Activity [Member]
Letter Of Credit Facility [Member]
USD ($)
|
Mar. 31, 2013
PPL Electric [Member]
USD ($)
|
Dec. 31, 2012
PPL Electric [Member]
USD ($)
|
Mar. 31, 2013
PPL Electric [Member]
Syndicated Credit Facility [Member]
USD ($)
|
Dec. 31, 2012
PPL Electric [Member]
Syndicated Credit Facility [Member]
USD ($)
|
Mar. 31, 2013
PPL Electric [Member]
Asset Backed Credit Facility [Member]
USD ($)
|
Dec. 31, 2012
PPL Electric [Member]
Asset Backed Credit Facility [Member]
USD ($)
|
Mar. 31, 2013
LGE [Member]
Syndicated Credit Facility [Member]
USD ($)
|
Dec. 31, 2012
LGE [Member]
Syndicated Credit Facility [Member]
USD ($)
|
Mar. 31, 2013
KU [Member]
USD ($)
|
Dec. 31, 2012
KU [Member]
USD ($)
|
Mar. 31, 2013
KU [Member]
Syndicated Credit Facility [Member]
USD ($)
|
Dec. 31, 2012
KU [Member]
Syndicated Credit Facility [Member]
USD ($)
|
May 31, 2013
KU [Member]
Letter Of Credit Facility [Member]
|
Mar. 31, 2013
KU [Member]
Letter Of Credit Facility [Member]
USD ($)
|
Dec. 31, 2012
KU [Member]
Letter Of Credit Facility [Member]
USD ($)
|
Mar. 31, 2013
PPL Energy Supply LLC [Member]
USD ($)
|
Dec. 31, 2012
PPL Energy Supply LLC [Member]
USD ($)
|
Mar. 31, 2013
PPL Energy Supply LLC [Member]
Syndicated Credit Facility [Member]
USD ($)
|
Dec. 31, 2012
PPL Energy Supply LLC [Member]
Syndicated Credit Facility [Member]
USD ($)
|
Mar. 31, 2013
PPL Energy Supply LLC [Member]
Uncommitted Credit Facilities [Member]
USD ($)
|
Dec. 31, 2012
PPL Energy Supply LLC [Member]
Uncommitted Credit Facilities [Member]
USD ($)
|
Feb. 28, 2013
PPL Energy Supply LLC [Member]
Letter Of Credit Facility [Member]
|
Mar. 31, 2013
PPL Energy Supply LLC [Member]
Letter Of Credit Facility [Member]
USD ($)
|
Dec. 31, 2012
PPL Energy Supply LLC [Member]
Letter Of Credit Facility [Member]
USD ($)
|
Mar. 31, 2013
PPL Energy Supply LLC [Member]
Facility Agreement [Member]
USD ($)
|
Mar. 31, 2013
PPL Energy Supply LLC [Member]
Secured Trading Facility [Member]
USD ($)
Integer
|
Apr. 30, 2013
PPL Energy Supply LLC [Member]
Subsequent To Period End Activity [Member]
Letter Of Credit Facility [Member]
USD ($)
|
Mar. 31, 2013
PPL Electric Utilities Corp [Member]
USD ($)
|
Dec. 31, 2012
PPL Electric Utilities Corp [Member]
USD ($)
|
Mar. 31, 2013
PPL Electric Utilities Corp [Member]
Syndicated Credit Facility [Member]
USD ($)
|
Dec. 31, 2012
PPL Electric Utilities Corp [Member]
Syndicated Credit Facility [Member]
USD ($)
|
Mar. 31, 2013
PPL Electric Utilities Corp [Member]
Asset Backed Credit Facility [Member]
USD ($)
|
Dec. 31, 2012
PPL Electric Utilities Corp [Member]
Asset Backed Credit Facility [Member]
USD ($)
|
Mar. 31, 2013
LG And E And KU Energy LLC [Member]
LGE [Member]
Syndicated Credit Facility [Member]
USD ($)
|
Dec. 31, 2012
LG And E And KU Energy LLC [Member]
LGE [Member]
Syndicated Credit Facility [Member]
USD ($)
|
Mar. 31, 2013
LG And E And KU Energy LLC [Member]
KU [Member]
USD ($)
|
Dec. 31, 2012
LG And E And KU Energy LLC [Member]
KU [Member]
USD ($)
|
Mar. 31, 2013
LG And E And KU Energy LLC [Member]
KU [Member]
Syndicated Credit Facility [Member]
USD ($)
|
Dec. 31, 2012
LG And E And KU Energy LLC [Member]
KU [Member]
Syndicated Credit Facility [Member]
USD ($)
|
May 31, 2013
LG And E And KU Energy LLC [Member]
KU [Member]
Letter Of Credit Facility [Member]
|
Mar. 31, 2013
LG And E And KU Energy LLC [Member]
KU [Member]
Letter Of Credit Facility [Member]
USD ($)
|
Dec. 31, 2012
LG And E And KU Energy LLC [Member]
KU [Member]
Letter Of Credit Facility [Member]
USD ($)
|
Mar. 31, 2013
Louisville Gas And Electric Co [Member]
Syndicated Credit Facility [Member]
USD ($)
|
Dec. 31, 2012
Louisville Gas And Electric Co [Member]
Syndicated Credit Facility [Member]
USD ($)
|
Mar. 31, 2013
Kentucky Utilities Co [Member]
USD ($)
|
Dec. 31, 2012
Kentucky Utilities Co [Member]
USD ($)
|
Mar. 31, 2013
Kentucky Utilities Co [Member]
Syndicated Credit Facility [Member]
USD ($)
|
Dec. 31, 2012
Kentucky Utilities Co [Member]
Syndicated Credit Facility [Member]
USD ($)
|
May 31, 2013
Kentucky Utilities Co [Member]
Letter Of Credit Facility [Member]
|
Mar. 31, 2013
Kentucky Utilities Co [Member]
Letter Of Credit Facility [Member]
USD ($)
|
Dec. 31, 2012
Kentucky Utilities Co [Member]
Letter Of Credit Facility [Member]
USD ($)
|
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Financing Activities [Line Items] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Expiration date | Dec. 21, 2016 | Jan. 24, 2013 | Jan. 12, 2017 | Apr. 16, 2016 | Apr. 16, 2016 | Nov. 06, 2017 | Mar. 31, 2013 | Mar. 31, 2014 | Jun. 30, 2017 | Nov. 03, 2017 | Oct. 18, 2017 | Sep. 23, 2013 | Nov. 06, 2017 | Nov. 06, 2017 | May 01, 2016 | Apr. 29, 2014 | [1] | Nov. 06, 2017 | Mar. 31, 2013 | Mar. 31, 2014 | Jun. 30, 2017 | Nov. 03, 2017 | Oct. 18, 2017 | Sep. 23, 2013 | Nov. 06, 2017 | Nov. 06, 2017 | May 01, 2016 | Apr. 29, 2014 | [1] | Nov. 06, 2017 | Nov. 06, 2017 | May 01, 2016 | Apr. 29, 2014 | [1] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Capacity | £ 210 | [2] | £ 150 | £ 245 | £ 300 | £ 300 | £ 1,139 | £ 84 | $ 3,400 | $ 3,000 | $ 200 | $ 200 | [3] | $ 150 | $ 400 | $ 300 | $ 100 | [4] | $ 500 | $ 598 | $ 400 | $ 198 | $ 3,400 | $ 3,000 | $ 200 | $ 200 | [3] | $ 150 | $ 400 | $ 300 | $ 100 | [4] | $ 500 | $ 598 | $ 400 | $ 198 | $ 500 | $ 598 | $ 400 | $ 198 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Borrowed | 109 | [5],[6] | 106 | [5],[6] | 171 | 171 | 65 | [5],[6] | 99 | 174 | [5] | 106 | [5] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Letters of credit issued and commercial paper backstop | 4 | 4 | 4 | 4 | 852 | 671 | 641 | 499 | 88 | 40 | 123 | 132 | 126 | 1 | 126 | 1 | 70 | 55 | 313 | 268 | 115 | 70 | 198 | 198 | 852 | 671 | 641 | 499 | 88 | 40 | 123 | 132 | 126 | 1 | 126 | 1 | 70 | 55 | 313 | 268 | 115 | 70 | 198 | 198 | 70 | 55 | 313 | 268 | 115 | 70 | 198 | 198 | |||||||||||||||||||||||||||||||||||||||||||||||||||
Unused capacity | 101 | 245 | 235 | 300 | 1,500 | [7] | 961 | 80 | 2,548 | 2,359 | 112 | 77 | 274 | 174 | 100 | 430 | 285 | 285 | 2,548 | 2,359 | 112 | 77 | 274 | 174 | 100 | 430 | 285 | 285 | 430 | 285 | 285 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Interest rate on outstanding borrowing | 1.9034% | 0.8452% | 1.30% | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Accounts receivable pledged under the credit facility | 277 | 238 | 277 | 238 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Unbilled revenue pledged under the credit facility | 98 | 106 | 98 | 106 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Available capacity under the asset-backed credit facility | 100 | 100 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Potential maximum Facility Agreement capacity | 500 | 500 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Secured energy marketing and trading facility capacity | $ 800 | $ 800 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Automatic renewal term (in years) | 1 | 1 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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