Schedule of Changes in Level 3 Plan Assets (Detail) (Significant Unobservable Inputs (Level 3), USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at January 1	$ 2,109	$ 1,516
Net Realized and Unrealized Gains/(Losses)	187	30
Net Purchases, Issuances and Settlements	(50)	497
Net Transfers Into/(Out of) Level 3	99	3
Currency Impact	(138)	63
Fair value of plan assets at December 31	2,207	2,109
Pooled Funds - Fixed Income Securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at January 1	15	10
Net Realized and Unrealized Gains/(Losses)	(15)	(1)
Net Purchases, Issuances and Settlements	15	2
Net Transfers Into/(Out of) Level 3	87	4
Currency Impact	(5)
Fair value of plan assets at December 31	97	15
Corporate Bonds And Other Fixed Income Securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at January 1	780	794
Net Realized and Unrealized Gains/(Losses)	80	17
Net Purchases, Issuances and Settlements	(64)	(48)
Net Transfers Into/(Out of) Level 3		(1)
Currency Impact	(47)	18
Fair value of plan assets at December 31	749	780
Real Estate
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at January 1	267	239
Net Realized and Unrealized Gains/(Losses)	37	10
Net Purchases, Issuances and Settlements	(2)	12
Net Transfers Into/(Out of) Level 3	10
Currency Impact	(20)	6
Fair value of plan assets at December 31	292	267
Hedge Funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at January 1	820	263
Net Realized and Unrealized Gains/(Losses)	40	(11)
Net Purchases, Issuances and Settlements	20	535
Currency Impact	(51)	33
Fair value of plan assets at December 31	829	820
Private Equity
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at January 1	227	210
Net Realized and Unrealized Gains/(Losses)	45	15
Net Purchases, Issuances and Settlements	(19)	(4)
Net Transfers Into/(Out of) Level 3	2
Currency Impact	(15)	6
Fair value of plan assets at December 31	$ 240	$ 227

The difference between fair value of plan assets at the end of the period and the fair value at the beginning of the period, adjusted for contributions and payments of benefits during the period, and after adjusting for taxes and other expenses, as applicable.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Actual Return on Plan Assets (Component of Net Periodic Postretirement Benefit Cost)

-URI http://asc.fasb.org/extlink&oid=6504192

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)(1)

-URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Actual Return on Plan Assets (Component of Net Periodic Pension Cost)

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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.

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The amount of increase or decrease in plan assets attributed to foreign currency changes. The effects of foreign currency exchange rate changes that are to be disclosed are those applicable to plans of a foreign operation whose functional currency is not the reporting currency.

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Amount of increase (decrease) in plan assets from purchases, sales and settlement of plan obligations.

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Transfers in and out of Level 3. For example, transfers due to changes in the observability of significant inputs.

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