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Derivatives and Risk Management Activities (Details 2) (USD $) |  | 1 Months Ended
--- | --- | ---
Sep. 30, 2013 | Sep. 30, 2013 PNG contract | Sep. 30, 2013 10 forward starting swaps (30-year) contract | Aug. 31, 2013 5 forward starting swaps (30-year) contract | Aug. 31, 2013 5 forward starting swaps (30-year) Interest expense
Interest Rate Risk Hedging |  |  |  |  |
Net deferred losses from interest rate risk hedging included in AOCI | $ (76,000,000) |  |  |  |
Number of outstanding interest rate swaps (in contracts) |  | 3 | 10 |  |
Notional amount of interest rate cash flow hedge derivatives |  |  | 250,000,000 |  |
Rate of fixed interest to be received on interest rate swap (as a percent) |  | 0.95% | 3.60% |  |
Notional amount of interest rate derivatives |  | 100,000,000 |  |  |
Number of interest rate swaps that terminated (in contracts) |  |  |  | 5 |
Proceeds from termination of interest rate swaps |  |  |  | 11,000,000 |
Gain on derivative instruments deferred in AOCI |  |  |  |  | 3,000,000
Gain on derivative instruments recognized in interest expense attributable to the ineffective portion |  |  |  | $ 8,000,000 |

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- Definition The portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments representing (a) the amount of the hedge ineffectiveness and (b) the amount, if any, excluded from the assessment of hedge effectiveness. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 205G -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 44C -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624171-113959 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 25 -Section 50 -Paragraph 1 -Subparagraph (a)(1),(2) -URI http://asc.fasb.org/extlink&oid=6886632&loc=d3e76258-113986 + Details
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