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Derivatives and Risk Management Activities (Details 2) (USD $) In Millions, unless otherwise specified |  | 1 Months Ended | 12 Months Ended |  | 1 Months Ended
--- | --- | --- | --- | --- | ---
Dec. 31, 2012 | Dec. 31, 2012 PNG contract | Jan. 31, 2011 Forward starting interest rate swaps terminated in January 2011 contract | Dec. 31, 2012 6 forward starting swaps (30-year) contract | Dec. 31, 2012 5 forward starting swaps (30-year) contract | Dec. 31, 2012 10 forward starting swaps (30-year) contract | Mar. 31, 2012 4 forward starting swaps (10-year) contract | Sep. 30, 2012 Interest Rate Swaps contract | Sep. 30, 2011 Interest Rate Swaps contract | Jul. 31, 2009 Interest Rate Swaps contract
Interest Rate Risk Hedging |  |  |  |  |  |  |  |  |  |
Net deferred losses from interest rate risk hedging included in AOCI | $ 143 |  |  |  |  |  |  |  |  |
Number of outstanding interest rate swaps (in contracts) |  | 3 |  |  | 5 | 10 |  |  |  | 4
Rate of fixed interest to be received on interest rate swap (as a percent) |  | 0.95% | 3.60% | 4.24% | 3.39% | 3.60% | 3.46% |  |  |
Rate of fixed interest to be received on interest rate swap (as a percent) |  |  |  |  |  |  |  |  |  | 4.25%
Notional amount of interest rate cash flow hedge derivatives |  |  |  |  | 125 | 250 |  |  |  |
Notional amount of interest rate derivatives |  | 100 | 100 | 250 |  |  | 200 |  |  | 300
Cash payment for (proceeds from) termination of interest rate swaps |  |  | $ (12) | $ 89 |  |  | $ 24 |  |  |
Basis for variable interest rate |  |  |  |  |  |  |  |  |  | three-month LIBOR plus a spread on a notional principal amount
Additional average spread over LIBOR (as a percent) |  |  |  |  |  |  |  |  |  | 2.42%
Number of interest rate swaps that terminate in June 2014 (in contracts) |  | 2 |  |  |  |  |  |  |  |
Number of interest rate swaps that terminate in August 2014 (in contracts) |  | 1 |  |  |  |  |  |  |  |
Number of interest rate swaps that terminated (in contracts) |  |  | 3 | 6 |  |  | 4 | 2 | 2 |

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- Definition This element represents the percentage of additional interest rate over LIBOR for computation of interest rate swap. + References No definition available. + Details
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- Definition Amount of gain or loss related to open and terminated interest rate derivatives that were designated for hedge accounting. + References No definition available. + Details
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- Definition The number of interest rate swaps that terminate in August 2014. + References No definition available. + Details
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- Definition The number of interest rate swaps that terminate in June 2014. + References No definition available. + Details
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- Definition The number of terminated interest rate swaps. + References No definition available. + Details
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- Definition Average fixed interest rate related to the group of interest rate derivatives. + References No definition available. + Details
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- Definition The reference rate for the variable rate of the interest rate derivative, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR. + References No definition available. + Details
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- Definition Fixed interest rate related to the interest rate derivative. + References No definition available. + Details
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- Details
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- Definition Aggregate notional amount of all interest rate derivatives designated as hedging instruments in cash flow hedges. Notional amount refers to the monetary amount specified in the interest rate derivative contract. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5579245-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Notional Amount -URI http://asc.fasb.org/extlink&oid=6519104 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5580258-113959 + Details
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- Definition Aggregate notional amount of interest rate derivatives, which relates to the currency amount specified in the interest rate derivative instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5579245-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Notional Amount -URI http://asc.fasb.org/extlink&oid=6519104 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5580258-113959 + Details
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- Definition Number of interest rate derivative instruments held by the entity at the reporting date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5579245-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5580258-113959 + Details
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- Definition The net cash outflow or inflow for a financial contract that meets the hedge criteria as either cash flow hedge, fair value hedge or hedge of net investment in foreign operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 27 -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3581-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3095-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3098-108585 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 14 -Footnote 4 -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. + Details
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