Supplemental Equity and Comprehensive Income Information (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Increase (decrease) in equity
Balance at the beginning of the period	$ 16,619	$ 16,887	$ 15,862	$ 16,017
Net income	1,186	1,177	2,327	2,280
Other comprehensive income (loss), net of tax:
Cumulative translation adjustment	(335)	234	(201)	476
Defined benefit pension and postretirement plans adjustment	98	54	195	130
Debt and equity securities - unrealized gain (loss)	(2)	(2)	1	(3)
Cash flow hedging instruments - unrealized gain (loss)	23	0	8	(17)
Total other comprehensive income (loss), net of tax	(216)	286	3	586
Dividends paid	(410)	(391)	(820)	(783)
Stock-based compensation, net of tax impacts	60	85	187	216
Reacquired stock	(633)	(669)	(1,167)	(1,344)
Issuances pursuant to stock option and benefit plans	267	376	481	756
Business combination allocation to noncontrolling interest				56
Purchase and sale of subsidiary shares - net		(9)		(42)
Balance at the end of the period	16,873	17,742	16,873	17,742
Common Stock and Additional Paid-in Capital
Increase (decrease) in equity
Balance at the beginning of the period	3,903	3,608	3,776	3,477
Other comprehensive income (loss), net of tax:
Stock-based compensation, net of tax impacts	60	85	187	216
Purchase and sale of subsidiary shares - net		(1)		(1)
Balance at the end of the period	3,963	3,692	3,963	3,692
Retained Earnings
Increase (decrease) in equity
Balance at the beginning of the period	28,858	26,521	28,348	25,995
Net income	1,167	1,160	2,292	2,241
Other comprehensive income (loss), net of tax:
Dividends paid	(410)	(391)	(820)	(783)
Issuances pursuant to stock option and benefit plans	(150)	(180)	(355)	(343)
Balance at the end of the period	29,465	27,110	29,465	27,110
Treasury Stock
Increase (decrease) in equity
Balance at the beginning of the period	(11,794)	(10,398)	(11,679)	(10,266)
Other comprehensive income (loss), net of tax:
Reacquired stock	(633)	(669)	(1,167)	(1,344)
Issuances pursuant to stock option and benefit plans	417	556	836	1,099
Balance at the end of the period	(12,010)	(10,511)	(12,010)	(10,511)
Accumulated Other Comprehensive Income (Loss)
Increase (decrease) in equity
Balance at the beginning of the period	(4,785)	(3,237)	(5,025)	(3,543)
Other comprehensive income (loss), net of tax:
Cumulative translation adjustment	(346)	225	(191)	473
Defined benefit pension and postretirement plans adjustment	98	53	195	129
Debt and equity securities - unrealized gain (loss)	(2)	(2)	1	(3)
Cash flow hedging instruments - unrealized gain (loss)	23	0	8	(17)
Balance at the end of the period	(5,012)	(2,961)	(5,012)	(2,961)
Noncontrolling Interest
Increase (decrease) in equity
Balance at the beginning of the period	437	393	442	354
Net income	19	17	35	39
Other comprehensive income (loss), net of tax:
Cumulative translation adjustment	11	9	(10)	3
Defined benefit pension and postretirement plans adjustment	0	1	0	1
Debt and equity securities - unrealized gain (loss)	0	0	0	0
Cash flow hedging instruments - unrealized gain (loss)	0	0	0	0
Business combination allocation to noncontrolling interest				56
Purchase and sale of subsidiary shares - net		(8)		(41)
Balance at the end of the period	$ 467	$ 412	$ 467	$ 412