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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, 2020 | Dec. 31, 2019
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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 | $ 14,613 | $ 13,003
Pension plans with a projected benefit obligation in excess of plan assets, fair value of plan assets | 12,672 | 11,361
Pension plans with an accumulated benefit obligation in excess of plan assets, accumulated benefit obligation | 13,489 | 12,009
Pension plans with an accumulated benefit obligation in excess of plan assets, fair value of plan assets | 11,685 | 10,484
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 | 8,951 | 7,421
Pension plans with a projected benefit obligation in excess of plan assets, fair value of plan assets | 7,526 | 6,135
Pension plans with an accumulated benefit obligation in excess of plan assets, accumulated benefit obligation | 4,288 | 2,476
Pension plans with an accumulated benefit obligation in excess of plan assets, fair value of plan assets | $ 3,033 | $ 1,501

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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/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 + 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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