CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
Statement of Financial Position [Abstract]
Accounts receivable, allowances	$ 343	$ 383
Common stock, par value (in dollars per share)	$ 0.000001	$ 0.000001
Common stock, shares authorized	2,400,000,000	2,400,000,000
Common stock, shares issued	1,163,179,140	1,150,605,926
Treasury stock, shares	428,676,471	428,676,471