CONSOLIDATED BALANCE SHEET (Parenthetical) - USD ($) $ in Millions	Sep. 30, 2015	Dec. 31, 2014
Statement of Financial Position [Abstract]
Allowance for doubtful accounts	$ 163	$ 153
Accounts receivable classified in Other assets	30	80
Inventories classified in Other assets	1,534	1,664
Accumulated depreciation	$ 16,043	$ 18,004
Common stock, par value (in dollars per share)	$ 0.50	$ 0.50
Common stock, shares authorized	6,500,000,000	6,500,000,000
Common stock, shares issued	3,577,103,522	3,577,103,522
Treasury stock, shares	774,869,058	738,963,326