Maximum Percent of Debt to Total Capitalization Ratio

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- Definition

Senior Note Maturity Year

+ References

No definition available.

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- Definition

Amount of noncash expense included in interest expense to amortize debt discount and premium associated with the related debt instruments. Excludes amortization of financing costs. Alternate captions include noncash interest expense.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 45

-Paragraph 1A

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-Subparagraph (SX 210.5-03.8)

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- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

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- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

+ Details

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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

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

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- Definition

Percentage price of original principal amount of debt at which debt can be redeemed by the issuer.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

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- Definition

Fair value amount of debt instrument that was repurchased.

+ References

No definition available.

+ Details

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- Definition

Face (par) amount of the original debt instrument that was repurchased.

+ References

No definition available.

+ Details

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- Definition

The amount of debt discount (net of debt premium) that was originally recognized at the issuance of the instrument that has yet to be amortized.

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-Publisher FASB

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- Definition

Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

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-Paragraph 28

-Subparagraph (b)

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- Definition

Reflects the difference between the fair value of payments made to legally extinguish a debt and its carrying value at that time. This item excludes the write-off of amounts previously capitalized as debt issuance costs.

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- Definition

The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used.

+ References

No definition available.

+ Details

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- Definition

Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.

+ References

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-Topic 210

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-Section S99

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-Subparagraph (SX 210.5-02.19(b),22(b))

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- Definition

Fair value of the amount outstanding under the credit facility.

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- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

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-Section S99

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-Subparagraph (SX 210.5-02.19(b),22(b))

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- Definition

Write-off of amounts previously capitalized as debt issuance cost in an extinguishment of debt.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.8)

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Debt (Details) (USD $)	3 Months Ended		1 Months Ended	2 Months Ended	3 Months Ended	1 Months Ended
Debt (Details) (USD $)	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2015	Mar. 08, 2015	Jun. 30, 2015	Apr. 30, 2015	Dec. 31, 2014	Jul. 31, 2015	Sep. 30, 2014	Mar. 17, 2011
Debt Instrument [Line Items]
Gains (Losses) on Extinguishment of Debt	$ 26,600,000	$ 0
Four Point Six Five Percent Marine Administration Bonds Including Current Maturities Member
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	4.65%		4.65%				4.65%
Five Point Two Percent Senior Notes [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	5.20%		5.20%				5.20%
Five Point Seven Five Percent Senior Notes Member [Domain]
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	5.75%		5.75%				5.75%
Three Point Two Five Percent Senior Notes Member
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	3.25%		3.25%				3.25%
Four Point Three Three Percent Marine Administration Bonds Including Current Maturities Member
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	4.33%		4.33%				4.33%
Revolving Credit Facility [Member] \| Five year credit facility [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Current Borrowing Capacity	2,250,000,000		2,250,000,000
Line of Credit Facility, Commitment Fee Percentage	0.125%
Line of Credit Facility, Maximum Borrowing Capacity	2,750,000,000		2,750,000,000
Line of Credit Facility, Fair Value of Amount Outstanding	0		0				0
Revolving Credit Facility [Member] \| Five year credit facility [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Maximum Percent of Debt to Total Capitalization Ratio			60.00%	50.00%
Revolving Credit Facility [Member] \| Five year credit facility [Member] \| Base Rate [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	0.125%
Revolving Credit Facility [Member] \| Five year credit facility [Member] \| London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	1.125%
Bonds [Member] \| Four Point Six Five Percent Marine Administration Bonds Including Current Maturities Member
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	4.65%		4.65%
Bonds [Member] \| Four Point Three Three Percent and Four Point Six Five Percent Maritime Administration Bonds [Member]
Debt Instrument [Line Items]
Debt Instrument, Repurchase Amount	65,300,000		65,300,000
Bonds [Member] \| Scenario, Forecast [Member] \| Four Point Three Three Percent and Four Point Six Five Percent Maritime Administration Bonds [Member]
Debt Instrument [Line Items]
Gains (Losses) on Extinguishment of Debt					(7,000,000)
Debt Instrument, Repurchase Amount						51,000,000		14,300,000
Acquired Debt [Member] \| Four Point Three Three Percent Marine Administration Bonds Including Current Maturities Member
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	4.33%		4.33%
Debt Instrument, Maturity Date	2016
Senior Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Redemption Price, Percentage	100.00%
Senior Notes [Member] \| Five Point Two Percent Senior Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	700,000,000		700,000,000
Debt instrument, interest rate, stated percentage	5.20%		5.20%
Debt Instrument, Maturity Date	2025
Debt Instrument, Unamortized Discount	2,600,000		2,600,000
Senior Notes [Member] \| Five Point Seven Five Percent Senior Notes Member [Domain]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	400,000,000		400,000,000						625,000,000
Debt instrument, interest rate, stated percentage	5.75%		5.75%						5.75%
Debt Instrument, Maturity Date	2044
Debt Instrument, Unamortized Discount	18,700,000		18,700,000
Senior Notes [Member] \| Three Point Two Five Percent Senior Notes Member
Debt Instrument [Line Items]
Debt Instrument, Face Amount										1,000,000,000
Debt Instrument, Repurchased Face Amount	854,600,000		854,600,000
Gains (Losses) on Extinguishment of Debt	(26,600,000)
Debt Instrument, Repurchase Amount	878,000,000		878,000,000
Gains (Losses) on Extinguishment of Debt, before Write off of Deferred Debt Issuance Cost	(23,400,000)
Amortization of Debt Discount (Premium)	1,700,000
Write off of Deferred Debt Issuance Cost	1,500,000
Debt instrument, interest rate, stated percentage										3.25%
Debt Instrument, Maturity Date	2016
Senior Notes [Member] \| Scenario, Forecast [Member] \| Three Point Two Five Percent Senior Notes Member
Debt Instrument [Line Items]
Debt Instrument, Repurchased Face Amount						145,400,000
Gains (Losses) on Extinguishment of Debt						$ (3,800,000)