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Stockholders' Equity - Reclassifications out of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2021 | Mar. 31, 2020
Reclassifications out of Accumulated Other Comprehensive Income [Line Items] |  |
Interest and sundry (income) expense | $ (26) | $ (1)
Reclassification out of Accumulated Other Comprehensive Income | Pension and postretirement benefits, pre-tax |  |
Reclassifications out of Accumulated Other Comprehensive Income [Line Items] |  |
Interest and sundry (income) expense | $ (10) |

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- Definition The aggregate amount of income or expense from ancillary business-related activities (that is to say, excluding major activities considered part of the normal operations of the business). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.7) -URI http://asc.fasb.org/extlink&oid=120395209&loc=SL114868664-224227 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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