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Pension and Other Postretirement Benefit Plans (Accumulated 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 Pension Benefits |  |
Defined Benefit Plans and Other Postretirement Benefit Plan [Line Items] |  |
Projected benefit obligation | $ 2,718 | $ 2,622
Accumulated benefit obligation | 2,703 | 2,609
Fair value of plan assets | 2,547 | 2,409
Foreign Pension Benefits |  |
Defined Benefit Plans and Other Postretirement Benefit Plan [Line Items] |  |
Projected benefit obligation | 951 | 800
Accumulated benefit obligation | 921 | 776
Fair value of plan assets | $ 546 | $ 450

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- Definition Amount of plan asset 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 (b) -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 (a) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2417-114920 + Details
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