Investments (Related Party Information For Investments In Affiliates) (Details) (USD $) In Millions			3 Months Ended		9 Months Ended
	Sep. 30, 2011	Dec. 31, 2010	Sep. 30, 2011 Affiliated Companies [Member]	Sep. 30, 2010 Affiliated Companies [Member]	Sep. 30, 2011 Affiliated Companies [Member]	Sep. 30, 2010 Affiliated Companies [Member]
Schedule of Investments [Line Items]
Corning sales to affiliated companies			$ 11	$ 5	$ 23	$ 16
Corning purchases from affiliated companies			8	18	64	52
Corning transfers of assets, at cost, to affiliated companies			34	26	95	87
Dividends received from affiliated companies			75	66	464	351
Royalty income from affiliated companies			51	73	178	205
Corning services to affiliates			15	10	36	25
Balances due to affiliated companies	15	7
Balances due from affiliated companies	$ 91	$ 101