Supplemental Equity and Comprehensive Income Information (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Increase (decrease) in equity
Balance at the beginning of the period	$ 17,924	$ 18,528	$ 17,948	$ 18,040
Net income	1,283	1,213	2,508	2,360
Other comprehensive income (loss), net of tax:
Cumulative translation adjustment	127	(279)	147	(677)
Defined benefit pension and postretirement plans adjustment	60	91	121	176
Debt and equity securities - unrealized gain (loss)	1	(4)	2	(4)
Cash flow hedging instruments - unrealized gain (loss)	(9)	8	(7)	32
Total other comprehensive income (loss), net of tax	179	(184)	263	(473)
Dividends declared	(556)	(436)	(555)	(876)
Purchase transfer from non-controlling interest	(5)		(5)
Sale of subsidiary shares				8
Stock-based compensation, net of tax impacts	97	64	267	192
Reacquired stock	(1,382)	(1,232)	(3,155)	(2,039)
Issuances pursuant to stock option and benefit plans	306	366	575	1,107
Balance at the end of the period	17,846	18,319	17,846	18,319
Common Stock and Additional Paid-in Capital
Increase (decrease) in equity
Balance at the beginning of the period	4,554	4,188	4,384	4,053
Other comprehensive income (loss), net of tax:
Purchase transfer from non-controlling interest	(1)		(1)
Sale of subsidiary shares				7
Stock-based compensation, net of tax impacts	97	64	267	192
Balance at the end of the period	4,650	4,252	4,650	4,252
Retained Earnings
Increase (decrease) in equity
Balance at the beginning of the period	33,312	31,073	32,416	30,679
Net income	1,267	1,197	2,474	2,326
Other comprehensive income (loss), net of tax:
Dividends declared	(556)	(436)	(555)	(876)
Issuances pursuant to stock option and benefit plans	(187)	(118)	(499)	(413)
Balance at the end of the period	33,836	31,716	33,836	31,716
Treasury Stock
Increase (decrease) in equity
Balance at the beginning of the period	(16,577)	(12,178)	(15,385)	(12,407)
Other comprehensive income (loss), net of tax:
Reacquired stock	(1,382)	(1,232)	(3,155)	(2,039)
Issuances pursuant to stock option and benefit plans	493	484	1,074	1,520
Balance at the end of the period	(17,466)	(12,926)	(17,466)	(12,926)
Accumulated Other Comprehensive Income (Loss)
Increase (decrease) in equity
Balance at the beginning of the period	(3,841)	(5,001)	(3,913)	(4,750)
Other comprehensive income (loss), net of tax:
Cumulative translation adjustment	123	(260)	131	(620)
Defined benefit pension and postretirement plans adjustment	60	91	121	176
Debt and equity securities - unrealized gain (loss)	1	(4)	2	(4)
Cash flow hedging instruments - unrealized gain (loss)	(9)	8	(7)	32
Balance at the end of the period	(3,666)	(5,166)	(3,666)	(5,166)
Noncontrolling Interest
Increase (decrease) in equity
Balance at the beginning of the period	476	446	446	465
Net income	16	16	34	34
Other comprehensive income (loss), net of tax:
Cumulative translation adjustment	4	(19)	16	(57)
Defined benefit pension and postretirement plans adjustment	0	0	0	0
Debt and equity securities - unrealized gain (loss)	0	0	0	0
Cash flow hedging instruments - unrealized gain (loss)	0	0	0	0
Purchase transfer from non-controlling interest	(4)		(4)
Sale of subsidiary shares				1
Balance at the end of the period	$ 492	$ 443	$ 492	$ 443