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Pensions And Other Postretirement Benefits - Accumulated Benefit Obligations and Projected Benefit Obligations (Details) - Pension Plan - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
U.S. |  |
ABO and PBO [Line Items] |  |
ABO | $ 66,448 | $ 64,669
Plans with ABO in Excess of Plan Assets [Abstract] |  |
ABO | 66,448 | 64,669
Fair Value of Plan Assets | 61,077 | 59,239
Plans with PBO in Excess of Plan Assets [Abstract] |  |
PBO | 66,468 | 64,684
Fair Value of Plan Assets | 61,077 | 59,239
Non-U.S. |  |
ABO and PBO [Line Items] |  |
ABO | 20,721 | 21,319
Plans with ABO in Excess of Plan Assets [Abstract] |  |
ABO | 12,042 | 10,996
Fair Value of Plan Assets | 4,185 | 3,940
Plans with PBO in Excess of Plan Assets [Abstract] |  |
PBO | 12,128 | 11,079
Fair Value of Plan Assets | $ 4,186 | $ 3,940

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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://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + 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=118255775&loc=d3e2417-114920 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921 Reference 3: 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=118255775&loc=d3e2417-114920 + Details
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