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Accounting Policies (Details) (USD $) | 12 Months Ended |  | 12 Months Ended | 3 Months Ended
--- | --- | --- | --- | ---
Dec. 31, 2012 units | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009 | Dec. 31, 2012 Minimum [Member] Software and Software Development Costs [Member] | Dec. 31, 2012 Minimum [Member] Building Improvements [Member] | Dec. 31, 2012 Minimum [Member] Equipment [Member] | Dec. 31, 2012 Maximum [Member] Software and Software Development Costs [Member] | Dec. 31, 2012 Maximum [Member] Building Improvements [Member] | Dec. 31, 2012 Maximum [Member] Equipment [Member] | Dec. 31, 2012 Other Income [Member]
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Pretax Gain Loss Recognized |  |  |  |  |  |  |  |  |  |  | $ 52,000,000
Fair Value of Total Borrowings | 900,000,000 |  |  |  |  |  |  |  |  |  |
Market value of investments | 760,000,000 | 835,000,000 | 1,416,000,000 | 1,118,000,000 |  |  |  |  |  |  |
Deferred technology costs, gross | 115,000,000 | 90,000,000 |  |  |  |  |  |  |  |  |
Accumulated amortization of deferred technology costs | 58,000,000 | 37,000,000 |  |  |  |  |  |  |  |  |
Number of operating segments | 4 |  |  |  |  |  |  |  |  |  |
Property, plant and equipment useful life |  |  |  |  | 3 years | 15 years | 2 years | 7 years | 40 years | 10 years |
Cost of advertisement | $ 34,000,000 | $ 32,000,000 | $ 30,000,000 |  |  |  |  |  |  |  |

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- Definition Amount charged to advertising expense for the period, which are expenses incurred with the objective of increasing revenue for a specified brand, product or product line. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 720 -SubTopic 35 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6420018&loc=d3e36677-107848 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Statement of Position (SOP) -Number 93-7 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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