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Derivatives and Risk Management Activities (Details 2) (USD $) In Millions, unless otherwise specified					1 Months Ended
	Mar. 31, 2014	Mar. 31, 2014 10 forward starting interest rate swaps (30-year) Cash flow hedge contract	Apr. 30, 2014 Treasury locks entered into in anticipation of issuance of 4.70% senior notes due 2044 Subsequent Event	Mar. 31, 2014 Treasury locks entered into in anticipation of issuance of 4.70% senior notes due 2044 Cash flow hedge contract	Apr. 30, 2014 Treasury locks entered into in anticipation of issuance of 4.70% senior notes due 2044 Cash flow hedge Subsequent Event	Apr. 30, 2014 Treasury locks entered into April 2014 Cash flow hedge Subsequent Event
Interest Rate Risk Hedging
Net deferred gains (losses) from interest rate risk hedging included in AOCI	$ (83)
Number of outstanding interest rate swaps (in contracts)		10		4
Rate of fixed interest to be received on interest rate swap (as a percent)		3.60%		3.64%
Notional amount of derivatives		250	250	200		50
Cash payment for (proceeds from) termination of interest rate swaps					$ 7

X

- Definition

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Article 12

-Section 13

-Sentence Column B

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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.

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- Definition

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

+ References

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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 1B

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



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-Name Accounting Standards Codification

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-Section 50

-Paragraph 1A

-Subparagraph (d)

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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 8

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3095-108585



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-Paragraph 27

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