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Pensions and Other Postretirement Benefits (Change in Fair Value of Company's Level 3 Pension Assets) (Detail) (Level 3, USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Beginning Balance	$ 519	$ 341
Realized gain	63	21
Unrealized gain/(loss) for positions still held	32	7
Transfers in/(out)	15	151
Defined Benefit Plan, Foreign Currency Exchange Rate Changes, Plan Assets	3
Ending Balance	632	519
Real Estate
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Beginning Balance	176	156
Realized gain	7	8
Unrealized gain/(loss) for positions still held	18	8
Transfers in/(out)	21	4
Ending Balance	222	176
Other Debt Securities
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Beginning Balance	27	28
Transfers in/(out)	(1)	(1)
Ending Balance	27	27
Hedge Funds & Other assets
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Beginning Balance	316	157
Realized gain	55	13
Unrealized gain/(loss) for positions still held	14	(1)
Transfers in/(out)	(5)	148
Defined Benefit Plan, Foreign Currency Exchange Rate Changes, Plan Assets	3
Ending Balance	$ 383	$ 316

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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