Casualty, Environmental and Other Reserves (Details) (USD $) In Millions, unless otherwise specified													3 Months Ended
	Sep. 30, 2011	Dec. 31, 2010	Sep. 30, 2011 Casualty claims	Dec. 31, 2010 Casualty	Jun. 01, 2010 Casualty	May 31, 2010 Casualty	Sep. 30, 2011 Personal Injury	Dec. 31, 2010 Personal Injury	Sep. 30, 2011 Occupational	Dec. 31, 2010 Occupational	Sep. 30, 2011 Asbestos	Dec. 31, 2010 Asbestos	Sep. 30, 2011 Separation	Dec. 31, 2010 Separation	Sep. 30, 2011 Environmental	Dec. 31, 2010 Environmental	Sep. 30, 2011 Other	Dec. 31, 2010 Other
All Contingencies Reserves [Line Items]
Casualty, environmental and other reserves, current	$ 200	$ 176	$ 97	$ 97			$ 78	$ 78	$ 10	$ 10	$ 9	$ 9	$ 16	$ 16	$ 55	$ 37	$ 32	$ 26
Casualty, environmental and other reserves, noncurrent	434	502	267	278			175	176	34	30	58	72	36	44	31	70	100	110
Casualty, environmental and other reserves, total	634	678	364	375			253	254	44	40	67	81	52	60	86	107	132	136
Self-insured retention amount					$ 50	$ 25
Number of Claims Expected to Exceed Self Insured Retention Amount			0
Separation liabilities, payment range term - in years													10 to 15 years
Environmental impaired sites															256