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Fair Value Of Pension Plan Assets (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	$ 2,109	$ 1,516	$ 1,411
Pooled Funds - Fixed Income Securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	15	10	7
Corporate Bonds And Other Fixed Income Securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	780	794	758
Real Estate
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	267	239	255
Hedge Funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	820	263	188
Private Equity
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	227	210	197
Other
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets			6
Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	9,159	8,205
Pension Plans | Cash
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	251	210
Pension Plans | U.S. Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	104	186
Pension Plans | Non-U.S. Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	665	932
Pension Plans | Pooled Funds - Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	2,571	1,673
Pension Plans | Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	3,340	2,791
Pension Plans | Government Bonds
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	1,560	1,440
Pension Plans | Pooled Funds - Fixed Income Securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	1,176	963
Pension Plans | Corporate Bonds And Other Fixed Income Securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	1,350	1,969
Pension Plans | Fixed Income Securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	4,086	4,372
Pension Plans | Real Estate
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	381	342
Pension Plans | Hedge Funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	820	263
Pension Plans | Private Equity
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	227	210
Pension Plans | Other
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	54	17
Quoted Prices In Active Markets For Identical Assets (Level 1) | Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	2,656	2,718
Quoted Prices In Active Markets For Identical Assets (Level 1) | Pension Plans | Cash
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	251	210
Quoted Prices In Active Markets For Identical Assets (Level 1) | Pension Plans | U.S. Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	104	185
Quoted Prices In Active Markets For Identical Assets (Level 1) | Pension Plans | Non-U.S. Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	665	932
Quoted Prices In Active Markets For Identical Assets (Level 1) | Pension Plans | Pooled Funds - Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	799	590
Quoted Prices In Active Markets For Identical Assets (Level 1) | Pension Plans | Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	1,568	1,707
Quoted Prices In Active Markets For Identical Assets (Level 1) | Pension Plans | Government Bonds
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	308	209
Quoted Prices In Active Markets For Identical Assets (Level 1) | Pension Plans | Pooled Funds - Fixed Income Securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	311	285
Quoted Prices In Active Markets For Identical Assets (Level 1) | Pension Plans | Corporate Bonds And Other Fixed Income Securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	108	210
Quoted Prices In Active Markets For Identical Assets (Level 1) | Pension Plans | Fixed Income Securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	727	704
Quoted Prices In Active Markets For Identical Assets (Level 1) | Pension Plans | Real Estate
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	110	97
Significant Other Observable Inputs (Level 2) | Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	4,394	3,971
Significant Other Observable Inputs (Level 2) | Pension Plans | U.S. Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets		1
Significant Other Observable Inputs (Level 2) | Pension Plans | Pooled Funds - Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	1,772	1,083
Significant Other Observable Inputs (Level 2) | Pension Plans | Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	1,772	1,084
Significant Other Observable Inputs (Level 2) | Pension Plans | Government Bonds
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	1,252	1,231
Significant Other Observable Inputs (Level 2) | Pension Plans | Pooled Funds - Fixed Income Securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	850	668
Significant Other Observable Inputs (Level 2) | Pension Plans | Corporate Bonds And Other Fixed Income Securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	462	965
Significant Other Observable Inputs (Level 2) | Pension Plans | Fixed Income Securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	2,564	2,864
Significant Other Observable Inputs (Level 2) | Pension Plans | Real Estate
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	4	6
Significant Other Observable Inputs (Level 2) | Pension Plans | Other
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	54	17
Significant Unobservable Inputs (Level 3) | Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	2,109	1,516
Significant Unobservable Inputs (Level 3) | Pension Plans | Pooled Funds - Fixed Income Securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	15	10
Significant Unobservable Inputs (Level 3) | Pension Plans | Corporate Bonds And Other Fixed Income Securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	780	794
Significant Unobservable Inputs (Level 3) | Pension Plans | Fixed Income Securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	795	804
Significant Unobservable Inputs (Level 3) | Pension Plans | Real Estate
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	267	239
Significant Unobservable Inputs (Level 3) | Pension Plans | Hedge Funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	820	263
Significant Unobservable Inputs (Level 3) | Pension Plans | Private Equity
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	$ 227	$ 210

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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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