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Contingencies and Commitments (Narrative) (Details) - USD ($) $ in Millions | 6 Months Ended |
--- | --- | ---
Jun. 30, 2016 | Dec. 31, 2015
Contingencies and Commitments (Textual) [Abstract] |  |
Total environmental accrual | $ 486 | $ 485
Expected years to incur a substantial amount of expenditures | 30 years |
Performance Guarantee [Member] |  |
Contingencies and Commitments (Textual) [Abstract] |  |
Letters of credit and bank guarantees | $ 481 |
Performance Guarantee [Member] | Revolving Credit Facility [Member] |  |
Contingencies and Commitments (Textual) [Abstract] |  |
Letters of credit and bank guarantees | $ 51 |

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- Definition Contingencies and commitments. + References No definition available. + Details
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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 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14326-108349 Reference 2: 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 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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