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Fair Value Disclosure (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended |  |  |  |
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Dec. 31, 2013 | Dec. 31, 2013 Minimum | Dec. 31, 2013 Maximum | Dec. 31, 2013 Carrying Amount Input Level 2, Fair Value | Dec. 31, 2012 Carrying Amount Input Level 2, Fair Value | Dec. 31, 2013 Fair Value Input Level 2, Fair Value | Dec. 31, 2012 Fair Value Input Level 2, Fair Value
Liabilities |  |  |  |  |  |  |
Liabilities-Long-term debt excluding capital lease obligations |  |  |  | $ 7,486 | $ 7,513 | $ 7,226 | $ 8,019
Fair value related additional information |  |  |  |  |  |  |
Discount rates used in valuations (as a percent) | 6.00% | 7.50% | 9.50% |  |  |  |

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- Details
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- Definition Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + Details
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- Definition The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. + References No definition available. + Details
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