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Employee Benefit Plans (Details 3) - Pension Benefits - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
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U.S. |  |
Pension Plans With Accumulated Benefit Obligation in Excess of Plan Assets |  |
Projected benefit obligations | $ 13,514 | $ 13,208
Accumulated benefit obligations | 12,129 | 11,891
Fair value of plan assets | 9,862 | 9,471
Int’l. |  |
Pension Plans With Accumulated Benefit Obligation in Excess of Plan Assets |  |
Projected benefit obligations | 1,590 | 1,449
Accumulated benefit obligations | 1,326 | 1,258
Fair value of plan assets | $ 413 | $ 287

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- Definition Amount of accumulated benefit obligation for defined benefit pension plan with accumulated benefit obligation in excess of plan assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e2417-114920 + Details
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