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Financing Activities (Tables) | 3 Months Ended
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Mar. 31, 2016
Debt Disclosure [Abstract] |
Schedule of Line of Credit Facilities | The following secured revolving credit facilities were in place at:
| March 31, 2016 |  | December 31, 2015
| Expiration Date |  | Capacity |  | Borrowed |  | Letters of Credit Issued |  | Unused Capacity |  | Borrowed |  | Letters of Credit Issued
Talen Energy Supply RCF (a) | June 2020 |  | $ | 1,850 |  |  | $ | — |  |  | $ | 157 |  |  | $ | 1,693 |  |  | $ | 500 |  |  | $ | 163 |
New MACH Gen RCF (b) | July 2021 |  | 160 |  |  | 127 |  |  | 31 |  |  | 2 |  |  | 108 |  |  | 31 |
Total Credit Facilities |  |  | $ | 2,010 |  |  | $ | 127 |  |  | $ | 188 |  |  | $ | 1,695 |  |  | $ | 608 |  |  | $ | 194 |
(a) | 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.
(b) | 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.

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- Definition Tabular disclosure of short-term or long-term contractual arrangements with lenders, including letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to 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. + 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(e),(f)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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