Stockholders' Equity (Schedule of Consolidated Changes in Equity) (Details) (USD $) In Millions	3 Months Ended		9 Months Ended		3 Months Ended				9 Months Ended				3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended								3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended		3 Months Ended	9 Months Ended				3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011 Comprehensive Income [Member]		Sep. 30, 2010 Comprehensive Income [Member]		Sep. 30, 2011 Comprehensive Income [Member]		Sep. 30, 2010 Comprehensive Income [Member]		Sep. 30, 2011 Comprehensive Income [Member] Pension Plans, Defined Benefit [Member]	Sep. 30, 2010 Comprehensive Income [Member] Pension Plans, Defined Benefit [Member]	Sep. 30, 2011 Comprehensive Income [Member] Pension Plans, Defined Benefit [Member]	Sep. 30, 2010 Comprehensive Income [Member] Pension Plans, Defined Benefit [Member]	Sep. 30, 2011 Comprehensive Income [Member] Other Postretirement Benefit Plans, Defined Benefit [Member]	Sep. 30, 2010 Comprehensive Income [Member] Other Postretirement Benefit Plans, Defined Benefit [Member]	Sep. 30, 2011 Comprehensive Income [Member] Other Postretirement Benefit Plans, Defined Benefit [Member]	Sep. 30, 2010 Comprehensive Income [Member] Other Postretirement Benefit Plans, Defined Benefit [Member]	Sep. 30, 2011 Preferred Stock [Member]	Jun. 30, 2011 Preferred Stock [Member]	Dec. 31, 2010 Preferred Stock [Member]	Sep. 30, 2010 Preferred Stock [Member]	Jun. 30, 2010 Preferred Stock [Member]	Dec. 31, 2009 Preferred Stock [Member]	Sep. 30, 2011 Common Stock [Member]	Sep. 30, 2010 Common Stock [Member]	Sep. 30, 2011 Common Stock [Member]	Sep. 30, 2010 Common Stock [Member]	Sep. 30, 2011 Additional Paid-in-Capital [Member]	Sep. 30, 2010 Additional Paid-in-Capital [Member]	Sep. 30, 2011 Additional Paid-in-Capital [Member]	Sep. 30, 2010 Additional Paid-in-Capital [Member]	Sep. 30, 2011 Reinvested Earnings [Member]	Sep. 30, 2010 Reinvested Earnings [Member]	Sep. 30, 2011 Reinvested Earnings [Member]	Sep. 30, 2010 Reinvested Earnings [Member]	Sep. 30, 2011 Accumulated Other Comprehensive Loss [Member]	Sep. 30, 2010 Accumulated Other Comprehensive Loss [Member]	Sep. 30, 2011 Accumulated Other Comprehensive Loss [Member]	Sep. 30, 2010 Accumulated Other Comprehensive Loss [Member]	Sep. 30, 2011 Accumulated Other Comprehensive Loss [Member] Pension Plans, Defined Benefit [Member]	Sep. 30, 2010 Accumulated Other Comprehensive Loss [Member] Pension Plans, Defined Benefit [Member]	Sep. 30, 2011 Accumulated Other Comprehensive Loss [Member] Pension Plans, Defined Benefit [Member]	Sep. 30, 2010 Accumulated Other Comprehensive Loss [Member] Pension Plans, Defined Benefit [Member]	Sep. 30, 2011 Accumulated Other Comprehensive Loss [Member] Other Postretirement Benefit Plans, Defined Benefit [Member]	Sep. 30, 2010 Accumulated Other Comprehensive Loss [Member] Other Postretirement Benefit Plans, Defined Benefit [Member]	Sep. 30, 2011 Accumulated Other Comprehensive Loss [Member] Other Postretirement Benefit Plans, Defined Benefit [Member]	Sep. 30, 2010 Accumulated Other Comprehensive Loss [Member] Other Postretirement Benefit Plans, Defined Benefit [Member]	Sep. 30, 2011 Treasury Stock [Member]	Sep. 30, 2011 Treasury Stock [Member]	Sep. 30, 2010 Treasury Stock [Member]	Jun. 30, 2010 Treasury Stock [Member]	Dec. 31, 2009 Treasury Stock [Member]	Sep. 30, 2011 Noncontrolling Interests [Member]	Sep. 30, 2010 Noncontrolling Interests [Member]	Sep. 30, 2011 Noncontrolling Interests [Member]	Sep. 30, 2010 Noncontrolling Interests [Member]	Sep. 30, 2011 Pension Plans, Defined Benefit [Member]	Sep. 30, 2010 Pension Plans, Defined Benefit [Member]	Sep. 30, 2011 Pension Plans, Defined Benefit [Member]	Sep. 30, 2010 Pension Plans, Defined Benefit [Member]	Sep. 30, 2011 Other Postretirement Benefit Plans, Defined Benefit [Member]	Sep. 30, 2010 Other Postretirement Benefit Plans, Defined Benefit [Member]	Sep. 30, 2011 Other Postretirement Benefit Plans, Defined Benefit [Member]	Sep. 30, 2010 Other Postretirement Benefit Plans, Defined Benefit [Member]
Beginning balance	$ 12,502	$ 9,276	$ 9,743	$ 7,651																	$ 237	$ 237	$ 237	$ 237	$ 237	$ 237	$ 305	$ 298	$ 301	$ 297	$ 9,978	$ 8,569	$ 9,227	$ 8,469	$ 13,683	$ 12,245	$ 12,030	$ 10,710	$ (5,453)	$ (5,796)	$ (5,790)	$ (5,771)									$ (6,727)	$ (6,727)	$ (6,727)	$ (6,727)	$ (6,727)	$ 479	$ 450	$ 465	$ 436
Sale of a majority interest in a consolidated subsidiary	(3)		(3)																																																					(3)		(3)
Net income	460	369	3,133	2,674	460		369		3,133		2,674																								452	367	3,101	2,655																		8	2	32	19
Cumulative translation adjustment	(348)	108	(231)	(43)	(348)		108		(231)		(43)																												(348)	106	(231)	(44)															2		1
Net revaluation and clearance of cash flow hedges to earnings	22	1	56	(11)	22		1		56		(11)																												24	1	61	(11)														(2)		(5)
Pension benefit plans													103	86	305	253	(10)	(8)	(29)	(35)																							103	86	305	253	(10)	(8)	(29)	(35)										103	86	305	253	(10)	(8)	(29)	(35)
Net unrealized gain (loss) on securities		1		(2)			1				(2)																													1		(2)
Other comprehensive income (loss), net of tax	(233)	188	101	162	(233)		188		101		162
Comprehensive income	227	557	3,234	2,836	227	[1]	557	[1]	3,234	[2]	2,836	[2]
Common dividends	(384)	(374)	(1,159)	(1,124)																															(382)	(374)	(1,150)	(1,122)																		(2)		(9)	(2)
Preferred dividends	(3)	(3)	(8)	(8)																															(3)	(3)	(8)	(8)
Common stock issued - compensation plans	85	195	889	296																								1	6	2	85	194	883	294
Common stock repurchased	(400)		(672)																																																(400)	(672)
Common stock retired	0		0																								(2)		(4)		(80)		(127)		(318)		(541)														400	672
Total Equity	12,024	9,651	12,024	9,651																	237	237	237	237	237	237	303	299	303	299	9,983	8,763	9,983	8,763	13,432	12,235	13,432	12,235	(5,684)	(5,610)	(5,684)	(5,610)									(6,727)	(6,727)	(6,727)	(6,727)	(6,727)	480	454	480	454
Comprehensive income attributable to noncontrolling interests					$ 6		$ 4		$ 27		$ 20

[1] Includes comprehensive income attributable to noncontrolling interests of $6 and $4 for the three months ended September 30, 2011 and 2010, respectively.

[2] Includes comprehensive income attributable to noncontrolling interests of $27 and $20 for the nine months ended September 30, 2011 and 2010, respectively.