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Additional Financial Information Depreciation and Amortization (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012
Property, Plant and Equipment [Line Items] |  |  |  |
Total depreciation and amortization | $ 242 | $ 104 | $ 524 | $ 313
Amortization of intangible assets |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Total depreciation and amortization | 226 | 87 | 477 | 262
Amortization of capitalized software |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Total depreciation and amortization | 11 | 13 | 33 | 39
Depreciation of fixed assets |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Total depreciation and amortization | $ 5 | $ 4 | $ 14 | $ 12

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- Definition The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration