Consolidated Statements of Equity (USD $) In Millions, unless otherwise specified	Total	Preferred Stock [Member]	Common Stock [Member]	Additional Paid-in Capital [Member]	Reinvested Earnings [Member]	Accumulated Other Comprehensive Income [Member]	Treasury Stock [Member]	Noncontrolling Interest [Member]	Comprehensive Income [Member]	Pension Plans, Defined Benefit [Member]	Pension Plans, Defined Benefit [Member] Accumulated Other Comprehensive Income [Member]	Pension Plans, Defined Benefit [Member] Noncontrolling Interest [Member]	Pension Plans, Defined Benefit [Member] Comprehensive Income [Member]	Other Long-Term Employee Benefit Plans Defined Benefit [Member]	Other Long-Term Employee Benefit Plans Defined Benefit [Member] Accumulated Other Comprehensive Income [Member]	Other Long-Term Employee Benefit Plans Defined Benefit [Member] Comprehensive Income [Member]
Balance at Dec. 31, 2008	$ 7,552	$ 237	$ 297	$ 8,380	$ 10,456	$ (5,518)	$ (6,727)	$ 427
Acquisition of a majority interest in a consolidated subsidiary	1							1
Purchase of subsidiary shares from noncontrolling interest	(1)							(1)
Net income	1,769				1,755			14	1,769
Cumulative translation adjustment	89					89			89
Net revaluation and clearance of cash flow hedges to earnings	95					93		2	95
Pension and other benefit plans										(337)	(333)	(4)	(337)	(106)	(106)	(106)
Net unrealized gain on securities	4					4			4
Total comprehensive income (loss)									1,514
Common dividends	(1,494)				(1,491)			(3)
Preferred dividends	(10)				(10)
Common Stock
Issued - compensation plans	89			89
Balance at Dec. 31, 2009	7,651	237	297	8,469	10,710	(5,771)	(6,727)	436
Acquisition of a majority interest in a consolidated subsidiary	9							9
Net income	3,052				3,031			21	3,052
Cumulative translation adjustment	(6)					(6)			(6)
Net revaluation and clearance of cash flow hedges to earnings	37					34		3	37
Pension and other benefit plans										(66)	(65)	(1)	(66)	17	17	17
Net unrealized gain on securities	1					1			1
Total comprehensive income (loss)									3,035
Common dividends	(1,503)				(1,500)			(3)
Preferred dividends	(10)				(10)
Common Stock
Issued - compensation plans	811		6	805
Repurchased	(250)						(250)
Retired			(2)	(47)	(201)		250
Balance at Dec. 31, 2010	9,743	237	301	9,227	12,030	(5,790)	(6,727)	465
Sale of a majority interest in a consolidated subsidiary	(3)							(3)
Net income	3,510				3,474			36	3,510
Cumulative translation adjustment	(457)					(457)			(457)
Net revaluation and clearance of cash flow hedges to earnings	65					72		(7)	65
Pension and other benefit plans										(2,255)	(2,244)	(11)	(2,255)	(332)	(332)	(332)
Net unrealized gain on securities	1					1			1
Total comprehensive income (loss)									532
Common dividends	(1,542)				(1,531)			(11)
Preferred dividends	(10)				(10)
Common Stock
Issued - compensation plans	1,014		7	1,007
Repurchased	(672)						(672)
Retired			(4)	(127)	(541)		672
Balance at Dec. 31, 2011	$ 9,062	$ 237	$ 304	$ 10,107	$ 13,422	$ (8,750)	$ (6,727)	$ 469