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Financing Activities | 3 Months Ended
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Mar. 31, 2016
Debt Disclosure [Abstract] |
Financing Activities | Financing Activities Credit Arrangements and Short-term Debt Talen Energy maintains credit arrangements to enhance liquidity and provide credit support. For reporting purposes, on a consolidated basis, the credit arrangements of Talen Energy Supply and its subsidiaries also apply to Talen Energy Corporation. Revolving 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.
Other Facilities Talen Energy Supply is party to a $500 million agreement expiring June 2017 that provides Talen Energy Supply the ability to request up to $500 million of committed unsecured letter of credit capacity at fees to be agreed upon at the time of each request, based on certain market conditions. At March 31, 2016, Talen Energy Supply had not requested any capacity for the issuance of letters of credit under this agreement. Talen Energy Supply is party to a $1.3 billion Amended STF Agreement that allows Talen Energy Supply to receive credit to satisfy collateral posting obligations related to Talen Energy's energy marketing and trading activities with counterparties participating in the facility. The facility became effective in December 2015 and has a five-year term ending December 2020 which automatically extends one-year on each anniversary of the effective date, subject to certain conditions. There were $87 million of secured obligations outstanding under this facility at March 31, 2016. Long-term Debt In December 2015, Talen Energy Supply announced an "exchange offer" for its 6.5% Senior Unsecured Notes due 2025 that were issued in a private offering in May 2015. Pursuant to the terms of the notes, Talen Energy Supply offered to exchange all of the outstanding notes for a like principal amount of its 6.5% Senior Notes due 2025 that were registered under the Securities Act of 1933, as amended. In January 2016, the exchange offer was completed with all of the notes exchanged. In connection with the sale of Talen Ironwood Holdings, LLC, in January 2016, a Talen Ironwood Holdings, LLC subsidiary completed the redemption of $41 million of its 8.857% Senior Secured Notes due 2025 prior to the closing of the sale transaction, which occurred in February 2016. The redemption included the payment of a make whole premium of $14 million, which is recorded in "(Gain) loss on sale" on the Statement of Income and is reflected in "Cash from operating activities" on the Statement of Cash Flows. See Note 7 for additional information on the sale.

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- Definition The entire disclosure for information about short-term and long-term debt arrangements, which includes amounts of borrowings under each line of credit, note payable, commercial paper issue, bonds indenture, debenture issue, own-share lending arrangements and any other contractual agreement to repay funds, and about the underlying arrangements, rationale for a classification as long-term, including repayment terms, interest rates, collateral provided, restrictions on use of assets and activities, whether or not in compliance with debt covenants, and other matters important to users of the financial statements, such as the effects of refinancing and noncompliance with debt covenants. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21475-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19,20,22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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