CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY - USD ($) shares in Millions, $ in Millions	Total	Common Stock Issued	Common Stock In Treasury	Retained Earnings	Accumulated Other Comprehensive Loss	Noncontrolling Interests
Balance at Dec. 31, 2012	$ 34,858	$ 11,912	$ (6,160)	$ 32,887	$ (3,888)	$ 107
Net income	6,774			6,732		42
Currency translation adjustments	(151)				(151)
Changes in fair value of marketable securities	35				35
Changes in fair value of cash flow hedges	(1)				(1)
Pension and other postretirement benefit plans	1,451				1,451
Shares sold to optionees, less shares exchanged	$ 267	(44)	$ 311
Shares sold to optionees, less shares exchanged, shares	5		5
Vesting of restricted stock		(56)	$ 56
Vesting of restricted stock, shares	1		1
Shares issued under employee stock purchase plan	$ 270	18	$ 252
Shares issued under employee stock purchase plan, shares	4		4
Stock repurchase program	$ (2,596)		$ (2,596)
Stock repurchase program, shares	(31)		(31)
Stock-based compensation expense	$ 315	315
Dividends declared	(1,653)			(1,653)
Other	66	47	$ 2			17
Balance at Dec. 31, 2013	$ 39,635	$ 12,192	$ (8,135)	37,966	(2,554)	166
Balance, shares at Dec. 31, 2012	1,328	1,434	(106)
Balance, shares at Dec. 31, 2013	1,307	1,434	(127)
Net income	$ 5,506			5,438		68
Currency translation adjustments	(463)				(463)
Changes in fair value of marketable securities	(166)				(166)
Changes in fair value of cash flow hedges	(125)				(125)
Pension and other postretirement benefit plans	(898)				(898)
Shares sold to optionees, less shares exchanged	$ 530	$ (26)	$ 556
Shares sold to optionees, less shares exchanged, shares	9		9
Vesting of restricted stock		(79)	$ 79
Vesting of restricted stock, shares	1		1
Shares issued under employee stock purchase plan	$ 295	33	$ 262
Shares issued under employee stock purchase plan, shares	4		4
Stock repurchase program	$ (4,678)		$ (4,678)
Stock repurchase program, shares	(48)		(48)
Stock-based compensation expense	$ 329	329
Dividends declared	(2,071)			(2,071)
Shares issued for acquisition	$ 213	72	$ 141
Shares issued for acquisition, shares	2		2
Other	$ (58)	(26)	$ 3			(35)
Balance at Dec. 31, 2014	$ 38,049	$ 12,495	$ (11,772)	41,333	(4,206)	199
Balance, shares at Dec. 31, 2014	1,275	1,434	(159)
Net income	$ 2,135			2,072		63
Currency translation adjustments	(522)				(522)
Changes in fair value of marketable securities	(10)				(10)
Changes in fair value of cash flow hedges	57				57
Pension and other postretirement benefit plans	123				123
Shares sold to optionees, less shares exchanged	$ 152	$ (38)	$ 190
Shares sold to optionees, less shares exchanged, shares	3		3
Vesting of restricted stock		(112)	$ 112
Vesting of restricted stock, shares	1		1
Shares issued under employee stock purchase plan	$ 296	17	$ 279
Shares issued under employee stock purchase plan, shares	4		4
Stock repurchase program	$ (2,182)		$ (2,182)
Stock repurchase program, shares	(27)		(27)
Stock-based compensation expense	$ 326	326
Dividends declared	(2,535)			(2,535)
Other	16	5	$ 1			10
Balance at Dec. 31, 2015	$ 35,905	$ 12,693	$ (13,372)	$ 40,870	$ (4,558)	$ 272
Balance, shares at Dec. 31, 2015	1,256	1,434	(178)