Commitments and Contingent Liabilities (Impact of PPG Settlement Arrangement Including Change in Fair Value of Stock to be Transferred) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Change in fair value:
PPG stock	$ 6	$ 23	$ (2)	$ 28
Equity forward instrument	(6)	(23)	1	(29)
Accretion of asbestos liability	3	3	7	7
Asbestos settlement - net expense	$ 3	$ 3	$ 6	$ 6