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Supplementary Information - Interest and Other Income (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Segment Reporting [Abstract]
Interest income	$ 60	$ 128	$ 110
Earnings of equity method investments	89	96	90
Interest and other income, net	$ 149	$ 224	$ 200

X

- Definition

Equity in net earnings of affiliated companies.

+ References

No definition available.

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X

- Definition

Includes operating interest income earned as part of a core business activity, equity income representing the undistributed income or loss of investments which are accounted for under the equity method of accounting, and other miscellaneous income or loss earned from core business activities.

+ References

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- Definition

Amount before accretion (amortization) of purchase discount (premium) of interest income on nonoperating securities.

+ 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(b))
-URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 22
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599

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- References

No definition available.

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