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Goodwill (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended
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Mar. 31, 2014
Changes in goodwill |
Balance at beginning of period | $ 2,503
Foreign currency translation adjustments | (18)
Balance at end of period | 2,485
Transportation |
Changes in goodwill |
Balance at beginning of period | 878
Foreign currency translation adjustments | (11)
Balance at end of period | 867
Facilities |
Changes in goodwill |
Balance at beginning of period | 1,162
Foreign currency translation adjustments | (5)
Balance at end of period | 1,157
Supply and Logistics |
Changes in goodwill |
Balance at beginning of period | 463
Foreign currency translation adjustments | (2)
Balance at end of period | $ 461

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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
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Period Type: | duration

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- Definition Amount of increase (decrease) from foreign currency translation adjustments of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267 + Details
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Namespace Prefix: | us-gaap_
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