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Derivatives and Risk Management Activities (Details 2) (USD $) In Millions, unless otherwise specified | Mar. 31, 2013
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Interest Rate Risk Hedging |
Net deferred losses from interest rate risk hedging included in AOCI | $ (123)
PNG |
Interest Rate Risk Hedging |
Number of outstanding interest rate swaps (in contracts) | 3
Rate of fixed interest to be received on interest rate swap (as a percent) | 0.95%
Notional amount of interest rate derivatives | 100
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
5 forward starting swaps (30-year) |
Interest Rate Risk Hedging |
Number of outstanding interest rate swaps (in contracts) | 5
Notional amount of interest rate cash flow hedge derivatives | 125
Rate of fixed interest to be received on interest rate swap (as a percent) | 3.39%
10 forward starting swaps (30-year) |
Interest Rate Risk Hedging |
Number of outstanding interest rate swaps (in contracts) | 10
Notional amount of interest rate cash flow hedge derivatives | $ 250
Rate of fixed interest to be received on interest rate swap (as a percent) | 3.60%

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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 Average fixed interest rate related to the group of interest rate derivatives. + References No definition available. + 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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