Commercial Paper, Capacity

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Debt Instrument, Basis Spread on Variable Rate, Effect of One Notch Change in Rating

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Line of Credit Facility, Commitment fee Percentage, Effect of One Notch Change in Rating

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- Definition

Maximum Days Of Maturity Of Notes

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Maximum Percent of Debt to Total Capitalization Ratio

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- Definition

Senior Note Maturity Year

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No definition available.

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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.

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Carrying value as of the balance sheet date of short-term borrowings using unsecured obligations issued by banks, corporations and other borrowers to investors. The maturities of these money market securities generally do not exceed 270 days.

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- Definition

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

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

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

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Description of the maturity date of the debt instrument including whether the debt matures serially and, if so, a brief description of the serial maturities.

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

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Fair value amount of debt instrument that was repurchased.

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

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

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

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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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Amount of interest capitalized during the period.

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-Glossary Allowance for Funds Used during Construction
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Amount of the cost of borrowed funds accounted for as interest expense.

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The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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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.

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No definition available.

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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.

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Fair value of the amount outstanding under the credit facility.

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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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- Definition

The fair value of notes issued in noncash investing and financing activities.

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Weighted average interest rate of short-term debt outstanding.

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

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Debt (Narrative) (Details) - USD ($)	2 Months Ended	3 Months Ended		9 Months Ended	10 Months Ended	12 Months Ended
Debt (Narrative) (Details) - USD ($)	Mar. 08, 2015	Sep. 30, 2014	Dec. 31, 2011	Sep. 30, 2015	Dec. 31, 2015	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Jul. 31, 2015	Apr. 30, 2015	Mar. 31, 2015	Mar. 17, 2011
Debt Instrument [Line Items]
Commercial paper					$ 0	$ 0	$ 0
Gains (Losses) on Extinguishment of Debt						(33,500,000)	0	$ 0
Net unamortized premiums					195,100,000	195,100,000
Interest Expense						216,300,000	161,400,000	158,800,000
Capitalized interest						$ 87,400,000	$ 78,200,000	$ 67,700,000
Senior Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Redemption Price, Percentage						0.00%
Commercial Paper Program [Member]
Debt Instrument [Line Items]
Commercial paper, capacity					$ 2,250,000,000	$ 2,250,000,000
Maximum days of maturity of notes						364
Weighted-average interest rate					0.41%	0.41%	0.26%
Debentures Due 2027 [Member]
Debt Instrument [Line Items]
Debt Instrument, Redemption Price, Percentage						0.00%
Five Point Two Percent Senior Notes [Member]
Debt Instrument [Line Items]
Debt instrument interest rate stated percentage					5.20%	5.20%
Debt instrument maturity period						2025
Four Point Five Percent Senior Notes Member [Member]
Debt Instrument [Line Items]
Debt instrument interest rate stated percentage					4.50%	4.50%
Debt instrument maturity period						2024
Five Point Seven Five Percent Senior Notes [Member]
Debt Instrument [Line Items]
Debt instrument interest rate stated percentage					5.75%	5.75%
Debt instrument maturity period						2044
6.875% Senior notes due 2020 [Member]
Debt Instrument [Line Items]
Senior Note Maturity Year						2020
Debt instrument interest rate stated percentage					6.875%	6.875%
Debt instrument maturity period						2020
8.50% Senior notes due 2019 [Member]
Debt Instrument [Line Items]
Debt instrument interest rate stated percentage					8.50%	8.50%
Debt instrument maturity period						2019
7.875% Senior notes due 2040 [Member]
Debt Instrument [Line Items]
Debt instrument interest rate stated percentage					7.875%	7.875%
Debt instrument maturity period						2040
7.20% Debentures due 2027 [Member]
Debt Instrument [Line Items]
Senior Note Maturity Year						2027
Unsecured debt instruments issued						$ 150,000,000.0
Debt instrument interest rate stated percentage					7.20%	7.20%
Debt instrument maturity period						2027
4.33% MARAD bonds due 2016 [Member]
Debt Instrument [Line Items]
Debt instrument interest rate stated percentage					4.33%	4.33%
Debt instrument maturity period						2016
3.25% Senior notes due 2016 [Member]
Debt Instrument [Line Items]
Debt instrument interest rate stated percentage					3.25%	3.25%
Debt instrument maturity period						2016
4.70% Senior notes due 2021 [Member]
Debt Instrument [Line Items]
Debt instrument interest rate stated percentage					4.70%	4.70%
Debt instrument maturity period						2021
Five Year Credit Facility Member
Debt Instrument [Line Items]
Total facility fee commitment					$ 0	$ 0	$ 0
Amounts outstanding					0	0	0
Bonds [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						$ 3,100,000
Debt Instrument, Repurchased Face Amount										$ 51,000,000
Debt Instrument, Repurchase Amount									$ 14,300,000
Bonds [Member] \| Four Point Six Five Percent Marine Administration Bonds Including Current Maturities Member
Debt Instrument [Line Items]
Senior Note Maturity Year						2020
Debt instrument interest rate stated percentage										4.65%
Acquired Debt [Member] \| Four Point Three Three Percent Marine Administration Bonds Including Current Maturities Member
Debt Instrument [Line Items]
Senior Note Maturity Year						2016
Debt instrument interest rate stated percentage										4.33%
Senior Notes [Member] \| Five Point Two Percent Senior Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount											$ 700,000,000
Senior Note Maturity Year				2025
Debt instrument interest rate stated percentage											5.20%
Discount to senior notes											$ 2,600,000
Senior Notes [Member] \| Four Point Five Percent Senior Notes Member [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount							$ 625,000,000
Senior Note Maturity Year							2024
Debt instrument interest rate stated percentage							4.50%
Discount to senior notes							$ 900,000
Senior Notes [Member] \| 6.875% Senior notes due 2020 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount					$ 900,000,000	$ 900,000,000
Senior Note Maturity Year						2020
Debt instrument interest rate stated percentage					6.875%	6.875%
Senior Notes [Member] \| 8.50% Senior notes due 2019 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount					$ 500,000,000	$ 500,000,000
Senior Note Maturity Year						2019
Debt instrument interest rate stated percentage					8.50%	8.50%
Senior Notes [Member] \| 7.875% Senior notes due 2040 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount					$ 300,000,000	$ 300,000,000
Senior Note Maturity Year						2040
Debt instrument interest rate stated percentage					7.88%	7.88%
Senior Notes [Member] \| 7.20% Debentures due 2027 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount					$ 150,000,000	$ 150,000,000
Debt instrument interest rate stated percentage					7.20%	7.20%
Senior Notes [Member] \| 4.70% Senior notes due 2021 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount			$ 1,500,000,000
Senior Note Maturity Year			2021
Debt instrument interest rate stated percentage			4.70%
Discount to senior notes			$ 29,600,000
Senior Notes [Member] \| Five Point Seven Five Percent Senior Notes Member [Domain]
Debt Instrument [Line Items]
Debt Instrument, Face Amount		$ 625,000,000									$ 400,000,000
Senior Note Maturity Year		2044
Debt instrument interest rate stated percentage		5.75%									5.75%
Discount to senior notes							$ 2,800,000				$ 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
Senior Note Maturity Year				2016
Debt instrument interest rate stated percentage												3.25%
Gains (Losses) on Extinguishment of Debt						$ 3,800,000
Debt Instrument, Repurchased Face Amount										$ 145,400,000	854,600,000
Debt Instrument, Repurchase Amount											$ 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
Senior Notes [Member] \| TenderOffer [Member] \| Three Point Two Five Percent Senior Notes Member
Debt Instrument [Line Items]
Gains (Losses) on Extinguishment of Debt						(26,600,000)
Revolving Credit Facility [Member] \| Five Year Credit Facility Member
Debt Instrument [Line Items]
Current borrowing capacity					$ 2,250,000,000	$ 2,250,000,000
Line of Credit Facility, Commitment fee Percentage, Effect of One Notch Change in Rating						0.025%
Maximum amount of right to increase the commitment					2,750,000,000	$ 2,750,000,000
Line of Credit Facility, Commitment Fee Percentage						0.15%
Line of Credit Facility, Fair Value of Amount Outstanding					$ 0	$ 0
Revolving Credit Facility [Member] \| Base Rate [Member] \| Five Year Credit Facility Member
Debt Instrument [Line Items]
Basis spread on variable rate						0.25%
Revolving Credit Facility [Member] \| London Interbank Offered Rate (LIBOR) [Member] \| Five Year Credit Facility Member
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate, Effect of One Notch Change in Rating						0.125%
Basis spread on variable rate						1.25%
Revolving Credit Facility [Member] \| Maximum [Member] \| Five Year Credit Facility Member
Debt Instrument [Line Items]
Maximum Percent of Debt to Total Capitalization Ratio	50.00%				60.00%