Supplemental Equity and Comprehensive Income Information (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Increase (decrease) in equity
Balance	$ 15,862	$ 16,017
Net income	1,141	1,103
Other comprehensive income (loss), net of tax:
Cumulative translation adjustment	134	242
Defined benefit pension and postretirement plans adjustment	97	76
Debt and equity securities - unrealized gain (loss)	3	(1)
Cash flow hedging instruments - unrealized gain (loss)	(15)	(17)
Total other comprehensive income (loss), net of tax	219	300
Dividends paid	(410)	(392)
Stock-based compensation, net of tax impacts	127	131
Reacquired stock	(534)	(675)
Issuances pursuant to stock option and benefit plans	214	380
Business combination allocation to noncontrolling interest		56
Purchase and sale of subsidiary shares - net		(33)
Balance	16,619	16,887
Common Stock and Additional Paid-in Capital
Increase (decrease) in equity
Balance	3,776	3,477
Other comprehensive income (loss), net of tax:
Stock-based compensation, net of tax impacts	127	131
Balance	3,903	3,608
Retained Earnings
Increase (decrease) in equity
Balance	28,348	25,995
Net income	1,125	1,081
Other comprehensive income (loss), net of tax:
Dividends paid	(410)	(392)
Issuances pursuant to stock option and benefit plans	(205)	(163)
Balance	28,858	26,521
Treasury Stock
Increase (decrease) in equity
Balance	(11,679)	(10,266)
Other comprehensive income (loss), net of tax:
Reacquired stock	(534)	(675)
Issuances pursuant to stock option and benefit plans	419	543
Balance	(11,794)	(10,398)
Accumulated Other Comprehensive Income (Loss)
Increase (decrease) in equity
Balance	(5,025)	(3,543)
Other comprehensive income (loss), net of tax:
Cumulative translation adjustment	155	248
Defined benefit pension and postretirement plans adjustment	97	76
Debt and equity securities - unrealized gain (loss)	3	(1)
Cash flow hedging instruments - unrealized gain (loss)	(15)	(17)
Balance	(4,785)	(3,237)
Noncontrolling Interest
Increase (decrease) in equity
Balance	442	354
Net income	16	22
Other comprehensive income (loss), net of tax:
Cumulative translation adjustment	(21)	(6)
Business combination allocation to noncontrolling interest		56
Purchase and sale of subsidiary shares - net		(33)
Balance	437	393
Comprehensive Income
Other comprehensive income (loss), net of tax:
Cumulative translation adjustment	134	242
Defined benefit pension and postretirement plans adjustment	97	76
Debt and equity securities - unrealized gain (loss)	3	(1)
Cash flow hedging instruments - unrealized gain (loss)	(15)	(17)
Total other comprehensive income (loss), net of tax	$ 219	$ 300