Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
Trade receivables, allowances	$ 54	$ 66
Other receivables, allowances	$ 109	$ 91
Common Stock, no par value
Common stock, shares authorized	5,000,000,000	5,000,000,000
Common Stock, shares issued	1,996,537,778	1,996,537,778
Treasury stock, shares	416,504,624	332,896,779