CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY (Unaudited) (USD $) In Millions	Total	Common Stock Issued	Common Stock In Treasury	Retained Earnings	Accumulated Other Comprehensive Loss	Noncontrolling Interests
Beginning Balance at Dec. 31, 2009	$ 19,229	$ 4,777	$ (5,002)	$ 22,019	$ (2,674)	$ 109
Comprehensive income
Net income	3,222			3,224		(2)
Currency translation adjustments					(29)
Changes in fair value of derivatives					(44)
Deferred employee benefits liabilities					120
Total comprehensive income	3,269
Shares sold to optionees, less shares exchanged	113	(3)	116
Shares granted to Directors	2	1	1
Vesting of restricted stock		(9)	9
Shares issued under employee stock purchase plan	178	49	129
Stock repurchase program	(1,268)		(1,268)
Stock-based compensation cost	145	145
Shares issued on conversion of debentures	320	17	303
Acquisition of Smith International Inc.	9,942	6,880	2,948			114
Acquisition of noncontrolling interests	(5)	3				(8)
Dividends declared (2011 - $0.75; 2010 - $0.63)	(789)			(789)
Tax benefits on stock options	14	14
Other	(34)		39			5
Ending Balance at Sep. 30, 2010	31,116	11,874	(2,803)	24,454	(2,627)	218
Beginning Balance at Dec. 31, 2010	31,444	11,920	(3,136)	25,210	(2,768)	218
Beginning Balance, in shares at Dec. 31, 2010	1,361	1,434	(73)
Comprehensive income
Net income	3,594			3,584		10
Currency translation adjustments					(51)
Changes in fair value of derivatives					(119)
Deferred employee benefits liabilities					140
Total comprehensive income	3,564
Shares sold to optionees, less shares exchanged	218	(22)	240
Shares granted to Directors	2	1	1
Vesting of restricted stock		(14)	14
Shares issued under employee stock purchase plan	208	53	155
Stock repurchase program	(2,362)		(2,362)
Stock-based compensation cost	203	203
Acquisition of noncontrolling interests	(628)	(547)				(81)
Dividends declared (2011 - $0.75; 2010 - $0.63)	(1,014)			(1,014)
Tax benefits on stock options	12	12
Other	(24)					(24)
Shares sold to optionees, less shares exchanged, in shares	6		6
Shares issued under employee stock purchase plan, in shares	3		3
Stock repurchase program, in shares	(28)		(28)
Ending Balance at Sep. 30, 2011	$ 31,623	$ 11,606	$ (5,088)	$ 27,780	$ (2,798)	$ 123
Ending Balance, in shares at Sep. 30, 2011	1,342	1,434	(92)