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Other Income and Expense (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2012 | Mar. 31, 2011
Component Of Other Income [Line Items] |  |
Total other income | $ 18 | $ 16
Component Of Operating Other Cost And Expense [Line Items] |  |
Total other expense | 29 | 15
Loss On Sale And Disposal Of Assets [Member] |  |
Component Of Operating Other Cost And Expense [Line Items] |  |
Total other expense | 24 | 10
Other Member |  |
Component Of Operating Other Cost And Expense [Line Items] |  |
Total other expense | $ 5 | $ 5

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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 SEC -Name Regulation S-X (SX) -Number 210 -Article 7 -Section 04 -Paragraph 4 Reference 2: 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 + Details
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