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Derivatives and Risk Management Activities (Details 2) (USD $) In Millions, unless otherwise specified	Jun. 30, 2013
Interest Rate Risk Hedging
Net deferred losses from interest rate risk hedging included in AOCI	$ (90)
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
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%

X

- Definition

Amount of gain or loss related to open and terminated interest rate derivatives that were designated for hedge accounting.

+ References

No definition available.

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X

- Definition

Average fixed interest rate related to the group of interest rate derivatives.

+ References

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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

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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

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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



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-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

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-Section 50

-Paragraph 1B

-URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5580258-113959

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