Debt and Other Obligations (Details) (Summary of Debt and Other Obligations) (USD $) In Millions, unless otherwise specified	Dec. 27, 2014	Dec. 28, 2013
Debt Instrument [Line Items]
Secured revolving line of credit, outstanding balance	$ 130us-gaap_LinesOfCreditCurrent	$ 55us-gaap_LinesOfCreditCurrent
Capital lease obligations	12us-gaap_CapitalLeaseObligations	16us-gaap_CapitalLeaseObligations
Long-term debt and capital lease obligation including current portion	2,212	2,058
Current portion of long-term debt and capital lease obligations	177	60
Long-term debt and capital lease obligations, less current portion	2,035	1,998
6.00% Convertible Senior Notes Due 2015
Debt Instrument [Line Items]
Long-term debt, net of discount	42	517
8.125% Senior Notes Due 2017
Debt Instrument [Line Items]
Long-term debt, net of discount	0	470
7.75% Senior Notes Due 2020
Debt Instrument [Line Items]
Long-term debt, net of discount	450	500
7.50% Senior Notes due 2022
Debt Instrument [Line Items]
Long-term debt, net of discount	475	500
Secured Revolving Line of Credit
Debt Instrument [Line Items]
Secured revolving line of credit, outstanding balance	$ 130

Long-term debt and capital lease obligation including current portion.

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- Definition

Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal through the balance sheet date.

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- Definition

The carrying value as of the balance sheet date of the current portion 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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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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-Glossary Line-of-Credit Arrangement

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- Definition

Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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

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Amount of long-term debt and capital lease obligation due after one year or beyond the normal operating cycle, if longer.

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-Name Staff Accounting Bulletin (SAB)

-Number Topic 6

-Section H

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Amount of long-term debt and capital leases due within one year or the normal operating cycle, if longer.

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