Consolidated Statement of Changes in Equity (USD $) In Millions, unless otherwise specified	Total	Common Stock and Additional Paid-in Capital	Retained Earnings	Treasury Stock	Accumulated Other Comprehensive Income (Loss)	Unearned Compensation	Noncontrolling Interest
Balance at Dec. 31, 2008	$ 10,304	$ 3,015	$ 22,227	$ (11,676)	$ (3,646)	$ (40)	$ 424
Increase (decrease) in equity
Net income	3,244		3,193				51
Other comprehensive income (loss), net of tax
Cumulative translation adjustment	273				286		(13)
Defined benefit pension and postretirement plans adjustment	(314)				(309)		(5)
Debt and equity securities - unrealized gain (loss)	10				10
Cash flow hedging instruments - unrealized gain (loss)	(80)				(80)
Total other comprehensive income (loss), net of tax	(111)
Dividends paid ($2.04, $2.10 and $2.20 per share 2009, 2010 and 2011)	(1,431)		(1,431)
Transfer to noncontrolling interest		(66)			(15)		81
Amortization of unearned compensation	40					40
Stock-based compensation, net of tax impacts	213	213
Reacquired stock	(17)			(17)
Issuances pursuant to stock option and benefit plans	1,060		(236)	1,296
Balance at Dec. 31, 2009	13,302	3,162	23,753	(10,397)	(3,754)		538
Increase (decrease) in equity
Net income	4,163		4,085				78
Other comprehensive income (loss), net of tax
Cumulative translation adjustment	244				205		39
Defined benefit pension and postretirement plans adjustment	(42)				(40)		(2)
Debt and equity securities - unrealized gain (loss)	3				3
Cash flow hedging instruments - unrealized gain (loss)	4				4
Total other comprehensive income (loss), net of tax	209
Dividends paid ($2.04, $2.10 and $2.20 per share 2009, 2010 and 2011)	(1,500)		(1,500)
Purchase of subsidiary shares and transfers from noncontrolling interest	(256)	4			39		(299)
Stock-based compensation, net of tax impacts	311	311
Reacquired stock	(880)			(880)
Issuances pursuant to stock option and benefit plans	668		(343)	1,011
Balance at Dec. 31, 2010	16,017	3,477	25,995	(10,266)	(3,543)		354
Increase (decrease) in equity
Net income	4,357		4,283				74
Other comprehensive income (loss), net of tax
Cumulative translation adjustment	(250)				(260)		10
Defined benefit pension and postretirement plans adjustment	(1,280)				(1,276)		(4)
Cash flow hedging instruments - unrealized gain (loss)	54				54
Total other comprehensive income (loss), net of tax	(1,476)
Dividends paid ($2.04, $2.10 and $2.20 per share 2009, 2010 and 2011)	(1,555)		(1,555)
Business combination allocation to noncontrolling interest	56						56
Purchase and sale of subsidiary shares - net	(49)	(1)					(48)
Stock-based compensation, net of tax impacts	300	300
Reacquired stock	(2,694)			(2,694)
Issuances pursuant to stock option and benefit plans	906		(375)	1,281
Balance at Dec. 31, 2011	$ 15,862	$ 3,776	$ 28,348	$ (11,679)	$ (5,025)		$ 442