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

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

Represents the number of wholly owned subsidiaries of the entity that have entered into interest rate swaps.

+ References

No definition available.

+ Details

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- Definition

Interest rate stated in the contractual debt agreement.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22(a)(1))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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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

Average variable 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.

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- Definition

Contractual rate at which a foreign currency can be purchased or sold.

+ References

No definition available.

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- Definition

The cash inflow from 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 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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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.

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Derivatives and Hedging (Details)					9 Months Ended							1 Months Ended				3 Months Ended
Derivatives and Hedging (Details)	Sep. 30, 2012 4.95% Senior Notes due November 2015	Sep. 30, 2012 5.25% Senior Notes due March 2013	Sep. 30, 2012 5% Notes due February 2013	Sep. 30, 2012 11% Callable Bonds	Sep. 30, 2012 Derivatives designated as hedging instruments Interest rate swaps subsidiary	Sep. 30, 2012 Derivatives designated as hedging instruments Interest rate swaps Fair value hedges Pay USD ($)	Sep. 30, 2012 Derivatives designated as hedging instruments Interest rate swaps Fair value hedges Receive USD ($)	Sep. 30, 2012 Derivatives designated as hedging instruments Interest rate swaps Cash flow hedges Pay USD ($)	Sep. 30, 2012 Derivatives designated as hedging instruments Interest rate swaps Cash flow hedges Receive USD ($)	Sep. 30, 2012 Derivatives designated as hedging instruments Cross-currency swaps Cash flow hedges Pay USD ($)	Sep. 30, 2012 Derivatives designated as hedging instruments Cross-currency swaps Cash flow hedges Receive NOK	Jun. 29, 2012 Derivative not designated as hedging instruments Interest rate swaps USD ($)	Sep. 30, 2012 Derivative not designated as hedging instruments Forward exchange contract Cash flow hedges NOK	Sep. 30, 2012 Derivative not designated as hedging instruments Forward exchange contract Cash flow hedges Pay USD ($)	Sep. 30, 2012 Derivative not designated as hedging instruments Forward exchange contract Cash flow hedges Receive NOK	Jun. 30, 2012 Derivatives de-designated as hedging instruments Interest rate swaps Fair value hedges USD ($)
Derivatives and Hedging
Number of wholly owned subsidiaries in interest rate swap agreements					2
Interest rate on notes hedged to reduce exposure to changes in fair value (as a percent)	4.95%	5.25%	5.00%	11.00%
Cash proceeds from termination of derivatives												$ 14,000,000				$ 23,000,000
Interest rate description to determine the variable interest on debt hedged					three-month London Interbank Offered Rate
Exchange rate of forward contract													5.40
Aggregate notional amount						$ 750,000,000	$ 750,000,000	$ 403,000,000	$ 403,000,000	$ 102,000,000	560,000,000			$ 1,100,000,000	6,100,000,000
Weighted average fixed rate (as a percent)							5.20%	2.40%		8.90%	11.00%
Weighted average variable rate (as a percent)						3.60%			0.40%