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Reconciliation of Level 3 Assets (Detail) (USD $) In Millions, unless otherwise specified											12 Months Ended						12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2011 United States Pension Plans of US Entity, Defined Benefit	Dec. 31, 2010 United States Pension Plans of US Entity, Defined Benefit	Dec. 31, 2009 United States Pension Plans of US Entity, Defined Benefit	Dec. 31, 2011 Foreign Pension Plans, Defined Benefit	Dec. 31, 2010 Foreign Pension Plans, Defined Benefit	Dec. 31, 2009 Foreign Pension Plans, Defined Benefit	Dec. 31, 2011 Fair Value, Inputs, Level 3 United States Pension Plans of US Entity, Defined Benefit	Dec. 31, 2010 Fair Value, Inputs, Level 3 United States Pension Plans of US Entity, Defined Benefit	Dec. 31, 2011 Fair Value, Inputs, Level 3 United States Pension Plans of US Entity, Defined Benefit Hedge Funds	Dec. 31, 2010 Fair Value, Inputs, Level 3 United States Pension Plans of US Entity, Defined Benefit Hedge Funds	Dec. 31, 2011 Fair Value, Inputs, Level 3 United States Pension Plans of US Entity, Defined Benefit Real Estate and Other Securities	Dec. 31, 2010 Fair Value, Inputs, Level 3 United States Pension Plans of US Entity, Defined Benefit Real Estate and Other Securities	Dec. 31, 2011 Fair Value, Inputs, Level 3 Foreign Pension Plans, Defined Benefit	Dec. 31, 2010 Fair Value, Inputs, Level 3 Foreign Pension Plans, Defined Benefit	Dec. 31, 2011 Fair Value, Inputs, Level 3 Foreign Pension Plans, Defined Benefit Insurance Contracts	Dec. 31, 2010 Fair Value, Inputs, Level 3 Foreign Pension Plans, Defined Benefit Insurance Contracts
Schedule of Pension and Other Postretirment Plan Assets by Fair Value [Line Items]
Fair value at beginning of period	$ 1,540	$ 1,576	$ 1,497	$ 1,456	$ 1,401	$ 43	$ 120	$ 136	$ 116	$ 98	$ 78	$ 109	$ 20	$ 2	$ 10	$ 10	$ 10	$ 9
Unrealized gains (losses) related to assets sold during the period												(36)
Unrealized gains (losses) related to assets still held at the reporting date											(5)	5	4				0	1
Purchases													19	18
Fair value at end of period	$ 1,540	$ 1,576	$ 1,497	$ 1,456	$ 1,401	$ 43	$ 120	$ 136	$ 116	$ 98	$ 73	$ 78	$ 43	$ 20	$ 10	$ 10	$ 10	$ 10

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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