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Employee Benefit Plans - Plan's Assets Carried at Fair Value (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Defined Benefit Plan Disclosure [Line Items]
Total Fair Value Measurements	$ 706	$ 517
Equity securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Total Fair Value Measurements	296	204
Bonds [Member]
Defined Benefit Plan Disclosure [Line Items]
Total Fair Value Measurements	172	139
Other Contract [Member]
Defined Benefit Plan Disclosure [Line Items]
Total Fair Value Measurements	238	174
Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total Fair Value Measurements
Fair Value, Inputs, Level 1 [Member] | Equity securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Total Fair Value Measurements
Fair Value, Inputs, Level 1 [Member] | Bonds [Member]
Defined Benefit Plan Disclosure [Line Items]
Total Fair Value Measurements
Fair Value, Inputs, Level 1 [Member] | Other Contract [Member]
Defined Benefit Plan Disclosure [Line Items]
Total Fair Value Measurements
Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total Fair Value Measurements	599	417
Fair Value, Inputs, Level 2 [Member] | Equity securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Total Fair Value Measurements	296	204
Fair Value, Inputs, Level 2 [Member] | Bonds [Member]
Defined Benefit Plan Disclosure [Line Items]
Total Fair Value Measurements	172	139
Fair Value, Inputs, Level 2 [Member] | Other Contract [Member]
Defined Benefit Plan Disclosure [Line Items]
Total Fair Value Measurements	131	74
Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total Fair Value Measurements	107	100	77
Fair Value, Inputs, Level 3 [Member] | Equity securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Total Fair Value Measurements
Fair Value, Inputs, Level 3 [Member] | Bonds [Member]
Defined Benefit Plan Disclosure [Line Items]
Total Fair Value Measurements
Fair Value, Inputs, Level 3 [Member] | Other Contract [Member]
Defined Benefit Plan Disclosure [Line Items]
Total Fair Value Measurements	$ 107	$ 100

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- Details

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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 20

-Section 50

-Paragraph 1

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920



Reference 2: 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=29635418&loc=d3e12355-114930

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