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Financing Activities (Revolving Credit Facilities) (Details) - USD ($) | Mar. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Credit Arrangments and Short-term Debt |  |  |
Capacity |  | $ 2,010,000,000 |
Borrowed |  | 127,000,000 | $ 608,000,000
Letters of Credit Issued |  | 188,000,000 | 194,000,000
Unused Capacity |  | 1,695,000,000 |
Letter of Credit | New MACH Gen Revolving Credit Facility |  |  |
Credit Arrangments and Short-term Debt |  |  |
Capacity |  | 120,000,000 |
Letter of Credit | Talen Energy Supply | Talen Energy Supply Revolving Credit Facility |  |  |
Credit Arrangments and Short-term Debt |  |  |
Capacity |  | 925,000,000 |
Revolving Credit Facility | New MACH Gen Revolving Credit Facility |  |  |
Credit Arrangments and Short-term Debt |  |  |
Capacity | [1] | 160,000,000 |
Borrowed | [1] | 127,000,000 | 108,000,000
Letters of Credit Issued | [1] | 31,000,000 | $ 31,000,000
Unused Capacity | [1] | $ 2,000,000 |
Weighted average interest rate |  | 5.14% | 5.04%
Revolving Credit Facility | Talen Energy Supply | Talen Energy Supply Revolving Credit Facility |  |  |
Credit Arrangments and Short-term Debt |  |  |
Capacity | [2] | $ 1,850,000,000 |
Borrowed | [2] | 0 | $ 500,000,000
Letters of Credit Issued | [2] | 157,000,000 | $ 163,000,000
Unused Capacity | [2] | $ 1,693,000,000 |
Weighted average interest rate |  |  | 2.67%
[1] | The facility provides New MACH Gen the ability to make revolving cash borrowings and to request the lenders to issue up to $120 million of letters of credit, which in combination cannot exceed the capacity of the facility at any given time. The weighted average interest rate on outstanding borrowings was 5.14% and 5.04% at March 31, 2016 and December 31, 2015. The amounts borrowed are recorded on the Balance Sheets as "Long-term debt" at March 31, 2016 and as "Short-term debt" at December 31, 2015. The classification as current at December 31, 2015 was based on Talen Energy's intent and ability to repay outstanding borrowings within the next year.
[2] | The facility is syndicated and provides Talen Energy Supply the ability to make revolving cash borrowings and to request the lenders to issue up to $925 million of letters of credit, which in combination cannot exceed the capacity of the facility at any given time. The weighted average interest rate on outstanding borrowings was 2.67% at December 31, 2015. The amounts borrowed are recorded as "Short-term debt" on the Balance Sheet.

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- Definition Aggregate amount of letters of credit issued under a credit facility as of the balance-sheet date, if applicable and inclusion of amounts issued under separate commercial paper program that reduces this facilities capacity. + References No definition available. + Details
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- Definition Weighted average interest rate of debt outstanding. + References No definition available. + Details
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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