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Pension and Other Postretirement Benefit Plans - Accumulated and Projected Benefit Obligation in Excess of Plan Assets (Details) - Pension Benefits - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
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United States |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Pension plans with a projected benefit obligation in excess of plan assets, projected benefit obligation | $ 10,620 | $ 11,904
Pension plans with a projected benefit obligation in excess of plan assets, fair value of plan assets | 9,648 | 10,896
Pension plans with an accumulated benefit obligation in excess of plan assets, accumulated benefit obligation | 9,702 | 676
Pension plans with an accumulated benefit obligation in excess of plan assets, fair value of plan assets | 8,966 | 0
International |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Pension plans with a projected benefit obligation in excess of plan assets, projected benefit obligation | 6,251 | 3,323
Pension plans with a projected benefit obligation in excess of plan assets, fair value of plan assets | 5,089 | 2,352
Pension plans with an accumulated benefit obligation in excess of plan assets, accumulated benefit obligation | 5,936 | 2,120
Pension plans with an accumulated benefit obligation in excess of plan assets, fair value of plan assets | $ 5,071 | $ 1,346

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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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