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Long-Term Debt (Details) - USD ($) $ in Millions | 3 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Mar. 31, 2017 | Dec. 31, 2016 | Apr. 07, 2016 | Jul. 20, 2015 | Apr. 01, 2015
Debt Instrument [Line Items] |  |  |  |  |
Sale leaseback financing obligation | $ 116 | $ 117 |  |  |
Line of credit | 761 | 1,000 |  |  |
Capital lease obligation and notes payable | 24 | 1 |  |  |
Total debt | 4,344 | 4,561 |  |  |
Less: current maturities | 5 | 5 |  |  |
Less: debt issuance costs | 44 | 47 |  |  |
Long-term debt, net of current maturities | $ 4,295 | 4,509 |  |  |
Fair Value, Measurement Inputs, Disclosure [Text Block] | 4.4 |  |  |  |
Term Loan [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Term Loan |  | 1,243 |  |  |
2014 Revolver [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Line of credit | $ 761 | 1,000 |  |  |
6.375% Senior Notes Due 2023 [Member] | Senior Notes [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Term Loan |  |  |  |  | $ 800
Senior notes | $ 800 | 800 |  |  |
Interest rate, stated percentage | 6.375% |  |  |  | 6.375%
5.500% Senior Notes Due 2020 [Member] | Senior Notes [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Term Loan |  |  |  | $ 600 |
Senior notes | $ 600 | 600 |  |  |
Interest rate, stated percentage | 5.50% |  |  | 5.50% |
6.250% Senior Notes Due 2021 [Member] | Senior Notes [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Term Loan |  |  | $ 800 |  |
Senior notes | $ 800 | $ 800 |  |  |
Interest rate, stated percentage | 6.25% |  | 6.25% |  |

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- Definition The carrying value as of the balance sheet date of the noncurrent 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. + References Reference 1: 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) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 45 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=28361426&loc=d3e1314-112600 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=28361426&loc=d3e1336-112600 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Line-of-Credit Arrangement -URI http://asc.fasb.org/extlink&oid=6517033 + Details
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