Jointly Owned Facilities (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013
Jointly Owned Facilities [Line Items]
Percentage of interest by Northwestern in Colstrip Unit 4	30.00%	30.00%
Proportionate share by each party of operating and construction costs regarding Colstrip Unit 3 or 4	15.00%	15.00%
Susquehanna Nuclear Generation Plant [Member]
Jointly Owned Facilities [Line Items]
Ownership interest	90.00%	90.00%
Electric plant	4,746	4,686
Accumulated depreciation	3,591	3,545
Construction work in progress	117	76
Conemaugh Generation Plant [Member]
Jointly Owned Facilities [Line Items]
Ownership interest	16.25%	16.25%
Electric plant	330	247
Accumulated depreciation	141	131
Construction work in progress	2	63
Keystone Generation Plant [Member]
Jointly Owned Facilities [Line Items]
Ownership interest	12.34%	12.34%
Electric plant	213	207
Accumulated depreciation	102	91
Construction work in progress	2	2
Trimble County Units 1 and 2 Generation Plant [Member]
Jointly Owned Facilities [Line Items]
Ownership interest	75.00%	75.00%
Electric plant	1,311	1,288
Accumulated depreciation	173	144
Construction work in progress	91	54
Merrill Creek Reservoir [Member]
Jointly Owned Facilities [Line Items]
Ownership interest	8.37%	8.37%
Other property	22	22
Accumulated depreciation	15	16
Colstrip Units 1 and 2 [Member]
Jointly Owned Facilities [Line Items]
Ownership interest	50.00%	50.00%
Colstrip Unit 3 [Member]
Jointly Owned Facilities [Line Items]
Ownership interest	30.00%	30.00%
PPL Energy Supply LLC [Member]
Jointly Owned Facilities [Line Items]
Percentage of interest by Northwestern in Colstrip Unit 4	30.00%	30.00%
Proportionate share by each party of operating and construction costs regarding Colstrip Unit 3 or 4	15.00%	15.00%
PPL Energy Supply LLC [Member] \| Susquehanna Nuclear Generation Plant [Member]
Jointly Owned Facilities [Line Items]
Ownership interest	90.00%	90.00%
Electric plant	4,746	4,686
Accumulated depreciation	3,591	3,545
Construction work in progress	117	76
PPL Energy Supply LLC [Member] \| Conemaugh Generation Plant [Member]
Jointly Owned Facilities [Line Items]
Ownership interest	16.25%	16.25%
Electric plant	330	247
Accumulated depreciation	141	131
Construction work in progress	2	63
PPL Energy Supply LLC [Member] \| Keystone Generation Plant [Member]
Jointly Owned Facilities [Line Items]
Ownership interest	12.34%	12.34%
Electric plant	213	207
Accumulated depreciation	102	91
Construction work in progress	2	2
PPL Energy Supply LLC [Member] \| Merrill Creek Reservoir [Member]
Jointly Owned Facilities [Line Items]
Ownership interest	8.37%	8.37%
Other property	22	22
Accumulated depreciation	15	16
PPL Energy Supply LLC [Member] \| Colstrip Units 1 and 2 [Member]
Jointly Owned Facilities [Line Items]
Ownership interest	50.00%	50.00%
PPL Energy Supply LLC [Member] \| Colstrip Unit 3 [Member]
Jointly Owned Facilities [Line Items]
Ownership interest	30.00%	30.00%
LG And E And KU Energy LLC [Member] \| Trimble County Unit 1 [Member]
Jointly Owned Facilities [Line Items]
Ownership interest	75.00%	75.00%
Electric plant	309	308
Accumulated depreciation	51	42
Construction work in progress	59	18
LG And E And KU Energy LLC [Member] \| Trimble County Unit 2 [Member]
Jointly Owned Facilities [Line Items]
Ownership interest	75.00%	75.00%
Electric plant	1,002	980
Accumulated depreciation	122	102
Construction work in progress	32	36
Louisville Gas And Electric Co [Member] \| E W Brown Units 6 And 7 [Member]
Jointly Owned Facilities [Line Items]
Ownership interest	38.00%	38.00%
Electric plant	40	40
Accumulated depreciation	10	7
Construction work in progress		1
Louisville Gas And Electric Co [Member] \| Paddys Run Unit 13 And E W Brown Unit 5 [Member]
Jointly Owned Facilities [Line Items]
Ownership interest	53.00%	53.00%
Electric plant	47	46
Accumulated depreciation	7	5
Construction work in progress		1
Louisville Gas And Electric Co [Member] \| Trimble County Unit 1 [Member]
Jointly Owned Facilities [Line Items]
Ownership interest	75.00%	75.00%
Electric plant	309	308
Accumulated depreciation	51	42
Construction work in progress	59	18
Louisville Gas And Electric Co [Member] \| Trimble County Unit 2 [Member]
Jointly Owned Facilities [Line Items]
Ownership interest	14.25%	14.25%
Electric plant	205	200
Accumulated depreciation	23	19
Construction work in progress	15	14
Louisville Gas And Electric Co [Member] \| Trimble County Units 5 And 6 [Member]
Jointly Owned Facilities [Line Items]
Ownership interest	29.00%	29.00%
Electric plant	29	29
Accumulated depreciation	5	3
Louisville Gas And Electric Co [Member] \| Trimble County Units 7 Through 10 [Member]
Jointly Owned Facilities [Line Items]
Ownership interest	37.00%	37.00%
Electric plant	70	69
Accumulated depreciation	11	7
Construction work in progress		1
Louisville Gas And Electric Co [Member] \| Cane Run Unit 7 Combined Cycle Gas Turbine [Member]
Jointly Owned Facilities [Line Items]
Ownership interest	22.00%	22.00%
Construction work in progress	113	91
Kentucky Utilities Co [Member] \| E W Brown Units 6 And 7 [Member]
Jointly Owned Facilities [Line Items]
Ownership interest	62.00%	62.00%
Electric plant	65	64
Accumulated depreciation	15	11
Construction work in progress	1	2
Kentucky Utilities Co [Member] \| Paddys Run Unit 13 And E W Brown Unit 5 [Member]
Jointly Owned Facilities [Line Items]
Ownership interest	47.00%	47.00%
Electric plant	42	42
Accumulated depreciation	6	4
Construction work in progress		1
Kentucky Utilities Co [Member] \| Trimble County Unit 2 [Member]
Jointly Owned Facilities [Line Items]
Ownership interest	60.75%	60.75%
Electric plant	797	780
Accumulated depreciation	98	83
Construction work in progress	17	22
Kentucky Utilities Co [Member] \| Trimble County Units 5 And 6 [Member]
Jointly Owned Facilities [Line Items]
Ownership interest	71.00%	71.00%
Electric plant	70	70
Accumulated depreciation	11	8
Kentucky Utilities Co [Member] \| Trimble County Units 7 Through 10 [Member]
Jointly Owned Facilities [Line Items]
Ownership interest	63.00%	63.00%
Electric plant	120	118
Accumulated depreciation	18	12
Construction work in progress	1	2
Kentucky Utilities Co [Member] \| Cane Run Unit 7 Combined Cycle Gas Turbine [Member]
Jointly Owned Facilities [Line Items]
Ownership interest	78.00%	78.00%
Construction work in progress	403	317

A seperate entity's proportionate share of interest in a utility plant which the company shares no ownership.

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- Definition

The proportionate share of operating and construction costs each party is responsible for in a jointly owned electricity generation plant.

+ References

No definition available.

+ Details

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- Definition

The period end amount owned by the reporting utility of a jointly owned utility plant in service.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 980

-SubTopic 360

-Section S99

-Paragraph 1

-Subparagraph (SAB TOPIC 10.C)

-URI http://asc.fasb.org/extlink&oid=6500719&loc=d3e659983-123033

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 10

-Section C

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- Definition

The period end amount of construction work in progress at a jointly owned electricity generation plant.

+ References

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- Definition

The period end ownership amount of other assets in a jointly owned utility plant.

+ References

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- Definition

The period end amount of accumulated depreciation in a jointly owned electricity generation plant.

+ References

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- Definition

The proportionate share of interest (percent) in a jointly owned utility plant.

+ References

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