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Debt and Other Obligations Debt Securities Activity (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended
--- | --- | ---
Dec. 31, 2015 | Nov. 30, 2015 | Dec. 31, 2015 | Dec. 31, 2014
Debt Instrument |  |  |  |
Redemptions/maturities of power bonds |  |  | $ 4 | $ 4
Total redemptions/maturities of debt |  |  | 4 |
electronotes |  |  |  |
Debt Instrument |  |  |  |
Redemptions/maturities of power bonds |  |  | $ 1 |
Interest rate | 2.65% |  | 2.65% |
2009 Series A |  |  |  |
Debt Instrument |  |  |  |
Redemptions/maturities of power bonds |  | $ 2 |  |
Interest rate |  | 2.25% |  |
2009 Series B |  |  |  |
Debt Instrument |  |  |  |
Redemptions/maturities of power bonds | $ 1 |  |  |
Interest rate | 3.77% |  | 3.77% |
Total |  |  |  |
Debt Instrument |  |  |  |
Percent of par value | 100.00% |  | 100.00% |

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- Definition Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium. + 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 210.5-02.22(a)(1)) -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 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 + Details
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