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Employee Benefit Plans Schedule of Pension Plan Assets at Fair Value (Detail) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Defined Benefit Plan Disclosure [Line Items]
Money market funds	$ 3	$ 2
Equity funds	19	21
Bond/fixed-income funds	27	28
Real-estate indirect investments	4	4
Commodities/Other		1
Insurance contracts	10	11	$ 10
Total Assets at fair value	63	67
Quoted Prices in Active Markets for Identical Assets (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Money market funds	0	0
Equity funds	0	0
Bond/fixed-income funds	0	0
Real-estate indirect investments	0	0
Commodities/Other		0
Insurance contracts	0	0
Total Assets at fair value	0	0
Significant Other Observable Inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Money market funds	3	2
Equity funds	19	21
Bond/fixed-income funds	27	28
Real-estate indirect investments	4	4
Commodities/Other		1
Insurance contracts	0	0
Total Assets at fair value	53	56
Significant Unobservable Inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Money market funds	0	0
Equity funds	0	0
Bond/fixed-income funds	0	0
Real-estate indirect investments	0	0
Commodities/Other		0
Insurance contracts	10	11
Total Assets at fair value	$ 10	$ 11

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Bond fixed income pension plan assets fair value.

+ References

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- Definition

Cash and cash equivalents and money market funds pension plan assets fair value.

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- Definition

Equity funds pension plan assets fair value.

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- Definition

Insurance contracts pension plan assets fair value.

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- Definition

Real estate indirect investment pension plan assets fair value.

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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.

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- Definition

Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 30
-Section 35
-Paragraph 50
-URI http://asc.fasb.org/extlink&oid=49178875&loc=d3e12355-114930

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920

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