Pension and Postretirement Benefit Plans - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended				12 Months Ended		1 Months Ended	12 Months Ended							3 Months Ended		6 Months Ended	12 Months Ended					1 Months Ended
	Dec. 31, 2011	Dec. 31, 2009	Dec. 31, 2011 Steelworkers Pension Trust Minimum Green Zone	Dec. 31, 2011 Steelworkers Pension Trust Minimum Yellow Zone	Dec. 31, 2011 Steelworkers Pension Trust Maximum	Dec. 31, 2011 Steelworkers Pension Trust Maximum Red Zone	Dec. 31, 2011 United States Pension Plans of US Entity, Defined Benefit	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 United States Pension Plans of US Entity, Defined Benefit Minimum	Dec. 31, 2011 United States Pension Plans of US Entity, Defined Benefit Growth Portfolio	Dec. 31, 2011 United States Pension Plans of US Entity, Defined Benefit Immunizing Portfolio	Dec. 31, 2011 United States Pension Plans of US Entity, Defined Benefit Liquidity Portfolio	Dec. 31, 2010 Foreign Pension Plans, Defined Benefit	Mar. 31, 2009 Foreign Pension Plans, Defined Benefit	Jun. 30, 2011 Foreign Pension Plans, 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 Foreign Postretirement Benefit Plans, Defined Benefit	Dec. 31, 2010 Foreign Postretirement Benefit Plans, Defined Benefit	Jan. 31, 2012 Defined Benefit Plan Contributions United States Pension Plans of US Entity, Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Estimated net actuarial loss for the defined benefit pension plan								$ 14
Minimum required contribution								30	50		30							14	18		6	6
Voluntary contribution									50														150
Reduced amount of benefit obligations due to settlements															32	43	77
Reduced amount of fair value of plan assets due to settlements															32	43	77
Pension benefit obligations settlement loss															2	1	5	5	2	1
Termination of pension service cost		2								2
Benefit obligations that are not required to be funded																		189			137
Defined benefit plan description	Investment policy — Target asset allocations of U.S. pension plans are established through an investment policy, which is updated periodically and reviewed by an Investment Committee, comprised of certain company officers and directors. The investment policy allows for a flexible asset allocation mix which is intended to provide appropriate diversification to lessen market volatility while assuming a reasonable level of economic risk. Our policy recognizes that properly managing the relationship between pension assets and pension liabilities serves to mitigate the impact of market volatility on our funding levels. The investment policy permits plan assets to be invested in a number of diverse categories, including a Growth Portfolio, an Immunizing Portfolio and a Liquidity Portfolio. These three sub-portfolios are intended to balance the generation of incremental returns with the management of overall risk.
Asset allocation												47.00%
Asset allocation ranges, Minimum												40.50%
Asset allocation ranges, Maximum												55.50%
Asset allocation													52.00%
Asset allocation ranges, Minimum													44.50%
Asset allocation ranges, Maximum													59.50%
Asset allocation														1.00%
Asset allocation ranges, Maximum														11.50%
Expected rate of return							7.00%
Projected contributions to be made to the defined benefit pension plans							$ 212	$ 212										$ 13
Fund percentage			80.00%	65.00%		65.00%
Percentage of contribution range					5.00%