Commitments and Contingencies - Additional Information (Details) (USD $) In Millions, unless otherwise specified				3 Months Ended
	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2013 Minimum	Mar. 31, 2013 Asbestos LegalMatter	Dec. 31, 2012 Asbestos LegalMatter	Mar. 31, 2013 Environmental Liability	Dec. 31, 2012 Environmental Liability	Mar. 31, 2010 Structural Products Lease
Commitments and Contingencies Disclosure [Line Items]
Asbestos claims pending				25,000	25,000
Asbestos claims settled and awaiting final documentation and dismissal, with or without payment				1,000
Asbestos claims accrued				$ 80	$ 83
Time horizon used to estimate liability				15 years
Probable recovery receivable				48	50	1	2
Guarantee of lease obligations, number of leases assigned (in leases)								3
Approval Amount For Dividends And Other Distributions			1
Other product liabilities, non-asbestos	1	1
Accrued environmental liabilities						9	11
Guarantee Obligations Other Contracts								$ 6