Long-Term Debt (Narrative) (Details) - USD ($)	6 Months Ended
Jun. 30, 2015	Dec. 31, 2014
Debt Instrument [Line Items]
Remaining outstanding principal	$ 9,534,000,000	$ 9,781,000,000
Bridge loan facility	10,900,000,000
Deferred financing costs	53,000,000
Accrued financing liabilities	185,000,000
Bridge Loan Reduction	$ 2,750,000,000
Secured Equipment Financing [Member]
Debt Instrument [Line Items]
Interest Rate	0.00%
Secured equipment financing	$ 3,000,000
Secured equipment financing term	4 years
Senior Unsecured Debt [Member]
Debt Instrument [Line Items]
Remaining outstanding principal	$ 9,502,000,000	$ 9,750,000,000
CoBank Term Loan 2011 [Member]
Debt Instrument [Line Items]
Debt instrument, face amount	$ 575,000,000
Debt instrument, maturity date	Oct. 14, 2016
Repayment of the outstanding principal balance, quarterly installments amount	$ 14,000,000
Initial pricing for LIBOR based borrowings (in hundredths)	3.875%
CoBank Term Loan 2014 [Member]
Debt Instrument [Line Items]
Debt instrument, face amount	$ 350,000,000
Repayment of the outstanding principal balance, quarterly installments amount	$ 9,000,000
Initial pricing for LIBOR based borrowings (in hundredths)	3.875%
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Line of credit facility maximum borrowing capacity	$ 750,000,000
Debt instrument, maturity date	May 31, 2018
Line of credit facility, current borrowings	$ 0
Interest Rate (in thousandths)	0.45%
Minimum [Member] \| CoBank Term Loan 2011 [Member] \| Base Rate [Member]
Debt Instrument [Line Items]
Interest Rate Margin	0.875%
Minimum [Member] \| CoBank Term Loan 2011 [Member] \| London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument [Line Items]
Interest Rate Margin	1.875%
Minimum [Member] \| CoBank Term Loan 2014 [Member] \| Base Rate [Member]
Debt Instrument [Line Items]
Interest Rate Margin	0.875%
Minimum [Member] \| CoBank Term Loan 2014 [Member] \| London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument [Line Items]
Interest Rate Margin	1.875%
Minimum [Member] \| Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Initial pricing for LIBOR based borrowings (in hundredths)	1.50%
Minimum [Member] \| Revolving Credit Facility [Member] \| Base Rate [Member]
Debt Instrument [Line Items]
Interest Rate Margin	0.50%
Minimum [Member] \| Revolving Credit Facility [Member] \| London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument [Line Items]
Interest Rate Margin	1.50%
Maximum [Member] \| CoBank Term Loan 2011 [Member] \| Base Rate [Member]
Debt Instrument [Line Items]
Interest Rate Margin	2.875%
Maximum [Member] \| CoBank Term Loan 2011 [Member] \| London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument [Line Items]
Interest Rate Margin	3.875%
Maximum [Member] \| CoBank Term Loan 2014 [Member] \| Base Rate [Member]
Debt Instrument [Line Items]
Interest Rate Margin	2.875%
Maximum [Member] \| CoBank Term Loan 2014 [Member] \| London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument [Line Items]
Interest Rate Margin	3.875%
Maximum [Member] \| Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Initial pricing for LIBOR based borrowings (in hundredths)	2.50%
Maximum [Member] \| Revolving Credit Facility [Member] \| Base Rate [Member]
Debt Instrument [Line Items]
Interest Rate Margin	1.50%
Maximum [Member] \| Revolving Credit Facility [Member] \| London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument [Line Items]
Interest Rate Margin	2.50%

Reduction of short-term financing

No definition available.

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- Definition

The initial pricing for LIBOR borrowings under the Credit Agreement.

+ References

No definition available.

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Carrying value as of the balance sheet date of obligations incurred and payable, pertaining to costs that are statutory in nature, are incurred on contractual obligations, or accumulate over time and for which invoices have not yet been received or will not be rendered. Examples include taxes, interest, rent and utilities. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

+ References

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- Definition

Short-Term financing which is expected to be paid back relatively quickly, such as by a subsequent longer-term loan. Also called swing loan or bridge financing.

+ References

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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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Amount of long-term debt before deduction of unamortized discount or premium. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, with initial maturities beyond one year or the normal operating cycle, if longer.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

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- Definition

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

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

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- Definition

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

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- Definition

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.

+ References

No definition available.

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- Definition

Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

+ References

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- Definition

Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

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- Definition

Net amount of current deferred finance costs capitalized at the end of the reporting period.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

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- Definition

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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-SubTopic 210

-Section S99

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-Subparagraph (SX 210.9-03.16)

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- Definition

The effective interest rate during the reporting period.

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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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- Definition

Amount of the required periodic payment applied to principal.

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- Definition

Secured financing other than securities sold under agreements to repurchase and securities loaned.

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