Condensed Consolidated Balance Sheet (Parenthetical) - USD ($) $ in Millions	Mar. 31, 2017	Dec. 31, 2016
Condensed Consolidated Balance Sheet
Trade receivables, allowances (in dollars)	$ 263	$ 250
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	1,960,925,194	1,707,475,455
Common shares held in treasury, shares	225,653,140	234,606,250