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Stockholders' Equity - Reclassifications out of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Reclassifications out of Accumulated Other Comprehensive Income [Line Items]
Interest and sundry (income) expense	$ (63)	$ 90	$ (193)	$ 82
Reclassification out of Accumulated Other Comprehensive Income
Reclassifications out of Accumulated Other Comprehensive Income [Line Items]
Interest and sundry (income) expense			$ 22
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	$ 11

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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=116634182&loc=SL114868664-224227

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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.

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