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Pension and Postretirement Benefit Plans and Defined Contribution Plans - Pension Plans in Excess of Plan Assets (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
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United States [Member] | Pension Plan [Member] |  |
Pension plans with an ABO in excess of plan assets: |  |
Fair value of plan assets | $ 13,051 | $ 14,284
ABO | 15,141 | 16,702
Pension plans with a PBO in excess of plan assets: |  |
Fair value of plan assets | 13,051 | 14,284
PBO | 15,141 | 16,702
United States [Member] | U.S. Supplemental (Non-Qualified) Pension Plans [Member] |  |
Pension plans with an ABO in excess of plan assets: |  |
ABO | 1,280 | 1,495
Pension plans with a PBO in excess of plan assets: |  |
PBO | 1,280 | 1,495
Foreign Plan [Member] | Pension Plan [Member] |  |
Pension plans with an ABO in excess of plan assets: |  |
Fair value of plan assets | 4,514 | 882
ABO | 6,286 | 2,724
Pension plans with a PBO in excess of plan assets: |  |
Fair value of plan assets | 5,432 | 1,626
PBO | $ 7,571 | $ 3,825

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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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