Supplemental Equity and Comprehensive Income Information (Details) (USD $) In Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Increase (decrease) in equity
Balance at the beginning of the period	$ 17,742	$ 14,263	$ 16,017	$ 13,302
Net income	1,103	1,125	3,383	3,220
Cumulative translation adjustment	(490)	669	(14)	216
Defined benefit pension and postretirement plans adjustment	77	48	207	147
Debt and equity securities - unrealized gain (loss)	(2)	3	(5)	5
Cash flow hedging instruments - unrealized gain (loss)	54	(52)	37	11
Total comprehensive income	742	1,793	3,608	3,599
Dividends paid	(388)	(375)	(1,171)	(1,124)
Business combination allocation to noncontrolling interest			56
Purchase and sale of subsidiary shares - net			(42)
Purchase of subsidiary shares and transfers from noncontrolling interest				(256)
Stock-based compensation, net of tax impacts	42	45	258	221
Reacquired stock	(837)	(11)	(2,181)	(415)
Issuances pursuant to stock option and benefit plans	111	118	867	506
Balance at the end of the period	17,412	15,833	17,412	15,833
Common Stock and Additional Paid-in Capital
Increase (decrease) in equity
Balance at the beginning of the period	3,692	3,345	3,477	3,162
Purchase and sale of subsidiary shares - net			(1)
Purchase of subsidiary shares and transfers from noncontrolling interest				7
Stock-based compensation, net of tax impacts	42	45	258	221
Balance at the end of the period	3,734	3,390	3,734	3,390
Retained Earnings
Increase (decrease) in equity
Balance at the beginning of the period	27,110	24,788	25,995	23,753
Net income	1,088	1,106	3,329	3,157
Dividends paid	(388)	(375)	(1,171)	(1,124)
Issuances pursuant to stock option and benefit plans	(26)	(26)	(369)	(293)
Balance at the end of the period	27,784	25,493	27,784	25,493
Treasury Stock
Increase (decrease) in equity
Balance at the beginning of the period	(10,511)	(10,146)	(10,266)	(10,397)
Reacquired stock	(837)	(11)	(2,181)	(415)
Issuances pursuant to stock option and benefit plans	137	144	1,236	799
Balance at the end of the period	(11,211)	(10,013)	(11,211)	(10,013)
Accumulated Other Comprehensive Income (Loss)
Increase (decrease) in equity
Balance at the beginning of the period	(2,961)	(4,016)	(3,543)	(3,754)
Cumulative translation adjustment	(507)	651	(34)	187
Defined benefit pension and postretirement plans adjustment	77	48	206	146
Debt and equity securities - unrealized gain (loss)	(2)	3	(5)	5
Cash flow hedging instruments - unrealized gain (loss)	54	(52)	37	11
Purchase of subsidiary shares and transfers from noncontrolling interest				39
Balance at the end of the period	(3,339)	(3,366)	(3,339)	(3,366)
Noncontrolling Interest
Increase (decrease) in equity
Balance at the beginning of the period	412	292	354	538
Net income	15	19	54	63
Cumulative translation adjustment	17	18	20	29
Defined benefit pension and postretirement plans adjustment			1	1
Business combination allocation to noncontrolling interest			56
Purchase and sale of subsidiary shares - net			(41)
Purchase of subsidiary shares and transfers from noncontrolling interest				(302)
Balance at the end of the period	$ 444	$ 329	$ 444	$ 329