Commitments and Contingent Liabilities (Accretion Of Future Funding Obligation) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Dec. 31, 2015
Commitments and Contingencies Disclosure [Line Items]
Total obligation	$ 1,100
Asbestos litigation reserve current	831	$ 796
Asbestos litigation reserve noncurrent	255	$ 252
Total	64
Asbestos Litigation Reserve Noncurrent [Member]
Commitments and Contingencies Disclosure [Line Items]
Future PPG cash payments to the Trust	505
Estimated Litigation Liability	325
Future Cash Payments to the Trust 2016-2023	320
Asbestos Issue [Member]
Commitments and Contingencies Disclosure [Line Items]
Remainder of 2016	11
2015	13
2016-2023	40
Total	$ 64