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Other Income and Expense (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2012 | Sep. 30, 2011 | Sep. 30, 2012 | Sep. 30, 2011
Component Of Other Income [Line Items] |  |  |  |
Total other income | $ 7 | $ 57 | $ 40 | $ 107
Component Of Operating Other Cost And Expense [Line Items] |  |  |  |
Total other expense | 15 | 76 | 59 | 126
Loss On Sale And Disposal Of Assets [Member] |  |  |  |
Component Of Operating Other Cost And Expense [Line Items] |  |  |  |
Total other expense | 13 | 31 | 48 | 57
Loss On Extinguishment Of Debt [Member] |  |  |  |
Component Of Operating Other Cost And Expense [Line Items] |  |  |  |
Total other expense | 0 | 37 | 0 | 52
Other Member |  |  |  |
Component Of Operating Other Cost And Expense [Line Items] |  |  |  |
Total other expense | 2 | 8 | 11 | 17
Tax Credit Settlement [Member] |  |  |  |
Component Of Other Income [Line Items] |  |  |  |
Total other income | 0 | 31 | 0 | 31
Tax Dispute Settlement [Member] |  |  |  |
Component Of Other Income [Line Items] |  |  |  |
Total other income | 0 | 14 | 0 | 14
Gain on sale of assets |  |  |  |
Component Of Other Income [Line Items] |  |  |  |
Total other income | 2 | 9 | 5 | 25
Insurance Proceeds [Member] |  |  |  |
Component Of Other Income [Line Items] |  |  |  |
Total other income | 0 | 0 | 10 | 0
Other Income Other [Member] |  |  |  |
Component Of Other Income [Line Items] |  |  |  |
Total other income | $ 5 | $ 3 | $ 25 | $ 37

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- Definition This element represents a sum total of expenses not separately reflected on the income statement for the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.4,6) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 + Details
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- Definition Reflects the sum of all other revenue and income recognized by the entity in the period not otherwise specified in the income statement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.4) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 4 -Article 7 + Details
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