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Commitments and Contingent Liabilities Commitments and Contingent Liabilities (Environmental) (Narrative) (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended
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Mar. 31, 2015
Environmental Remediation [Line Items] |
Accrual for environmental remediation activities | 482 us-gaap_AccrualForEnvironmentalLossContingencies
Potential environmental liability in excess of accrued amount | 1,100 dd_Potentialenvironmentalliabilityinexcessofaccruedamount
Minimum [Member] |
Environmental Remediation [Line Items] |
Average time frame of disbursements of environmental site remediation | 15 years
Maximum [Member] |
Environmental Remediation [Line Items] |
Average time frame of disbursements of environmental site remediation | 20 years

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- Definition Total costs accrued as of the balance sheet date for environmental loss contingencies. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13207-110859 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14326-108349 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 25 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6395460&loc=d3e13647-108346 + Details
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