Condensed Consolidated Balance Sheet (Parenthetical) - USD ($) $ in Millions	Sep. 30, 2015	Dec. 31, 2014
Condensed Consolidated Balance Sheet
Trade receivables, allowances (in dollars)	$ 358	$ 310
Preferred shares, par value (in dollars per share)	$ 1	$ 1
Preferred shares, Authorized shares	1,000,000	1,000,000
Preferred shares, issued shares	0	0
Common shares, Authorized shares	2,400,000,000	2,400,000,000
Common shares, Issued shares	1,700,525,346	1,694,929,949
Common shares held in treasury, shares	208,805,455	186,894,515