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Employee Benefit Plans Amounts in Accumulated Other Comprehensive Income Expected to be Recognized as Components of Net Periodic Benefit Cost (Detail) $ in Millions	Dec. 31, 2017 USD ($)
Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Net loss to be recognized in other comprehensive income	$ 1
Postemployment Retirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Net loss to be recognized in other comprehensive income	$ 4

X

- 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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X

- Definition

Amount of cost (credit) included in accumulated other comprehensive (income) loss expected to be recognized in net periodic benefit cost (credit) for fiscal year following most recent annual statement of financial position.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (s)
-URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920

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- Details

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- Details

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