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Commitments and Contingent Liabilities (Impact of PPG Settlement Arrangement Including Change in Fair Value of Stock to be Transferred) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Change in fair value:
PPG stock	$ 13	$ (28)	$ 44	$ 18
Equity forward instrument	(12)	28	(45)	(18)
Accretion of asbestos liability	2	3	10	9
Asbestos settlement - net expense	$ 3	$ 3	$ 9	$ 9

- Definition

Amount recognized for the passage of time, typically for liabilities, that have been discounted to their net present values. Excludes accretion associated with asset retirement obligations.

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