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Pensions And Other Postretirement Benefits Accumulated Benefit Oblligations and Projected Benefit Obligations (Details) - Pension Plan [Member] - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
U.S. [Member] |  |
ABO and PBO [Line Items] |  |
ABO | $ 61,177 | $ 68,437
Plans with ABO in Excess of Plan Assets [Abstract] |  |
ABO | 61,177 | 68,437
Fair Value of Plan Assets | 56,102 | 62,639
Plans with PBO in Excess of Plan Assets [Abstract] |  |
PBO | 61,190 | 68,450
Fair Value of Plan Assets | 56,102 | 62,639
Non-U.S. [Member] |  |
ABO and PBO [Line Items] |  |
ABO | 19,822 | 22,650
Plans with ABO in Excess of Plan Assets [Abstract] |  |
ABO | 10,289 | 21,679
Fair Value of Plan Assets | 3,485 | 13,408
Plans with PBO in Excess of Plan Assets [Abstract] |  |
PBO | 10,356 | 21,822
Fair Value of Plan Assets | $ 3,485 | $ 13,411

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- Definition Amount of actuarial present value of benefits attributed to employee service rendered, excluding assumptions about future compensation level. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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- Definition Amount of plan asset for defined benefit pension plan with projected benefit obligation in excess of plan assets. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e2417-114920 + Details
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- Definition Amount of accumulated benefit obligation for defined benefit plan with accumulated benefit obligation in excess of plan assets. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e2417-114920 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e2417-114920 + Details
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