Contingencies And Commitments (Environmental Matters) (Narrative) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended		1 Months Ended	12 Months Ended			1 Months Ended	12 Months Ended			12 Months Ended						12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Jun. 30, 2003 Massena West, NY [Member]	Dec. 31, 2010 Massena West, NY [Member]	Dec. 31, 2011 U.S. Smelters [Member]	Dec. 31, 2010 U.S. Smelters [Member]	Nov. 30, 2008 Grasse River [Member]	Dec. 31, 2011 Grasse River [Member]	Dec. 31, 2010 Grasse River [Member]	Mar. 24, 2010 Grasse River [Member]	Dec. 31, 2005 East St. Louis, IL [Member]	Dec. 31, 2008 Vancouver Smelter Site [Member]	Dec. 31, 2009 Columbia River [Member]	Dec. 31, 2009 Fusina Site [Member]	Dec. 31, 2009 Portovesme Site [Member]	Dec. 31, 2010 Russia Facility [Member]	Dec. 31, 2011 Other Sites [Member]	Dec. 31, 2010 Other Sites [Member]	Dec. 31, 2011 Aerospace Fasteners Business [Member]	Dec. 31, 2011 Recurring Costs Of Managing Hazardous Substances And Environmental Programs [Member]
Loss Contingencies [Line Items]
Number of cleanup locations	more than 100
Remediation reserve balance	$ 347	$ 333
Remediation reserve balance, classified as a current liability	58	31
Remediation reserve increase				46	31		40	1	2		15	16	2	12	3		13	11
Remediation reserve adjustment				19	18	14				17						9
Charges related to settlement offer made for outstanding claims				11
Period of time between potential phenomenon occurrences, years			10
Payments related to remediation expenses applied against the reserve	19	17
Percentage of cost of goods sold																				2.00%
Recommended capping remedy min	20
Recommended capping remedy max	100
Increase (decrease) in reserves due to effects of foreign currency translation	$ (1)	$ (3)																	$ 3