Supplemental Equity and Comprehensive Income Information - SE Rf (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Increase (decrease) in equity
Balance at the beginning of the period	$ 11,774	$ 13,952	$ 11,747	$ 13,142
Net income	1,293	1,303	2,571	2,504
Other comprehensive income (loss), net of tax:
Cumulative translation adjustment	37	23	175	(170)
Defined benefit pension and postretirement plans adjustment	67	96	136	187
Cash flow hedging instruments - unrealized gain (loss)	(27)	(32)	(137)	38
Total other comprehensive income (loss), net of tax	77	87	174	55
Dividends declared	(672)	(646)	(1,344)	(649)
Stock-based compensation, net of tax impacts in 2015	47	78	172	306
Reacquired stock	(837)	(1,787)	(2,000)	(2,683)
Issuances pursuant to stock option and benefit plans	255	143	617	455
Balance at the end of the period	11,937	13,130	11,937	13,130
Common Stock and Additional Paid-in Capital
Increase (decrease) in equity
Balance at the beginning of the period	4,925	4,616	4,800	4,388
Other comprehensive income (loss), net of tax:
Stock-based compensation, net of tax impacts in 2015	47	78	172	306
Balance at the end of the period	4,972	4,694	4,972	4,694
Retained Earnings
Increase (decrease) in equity
Balance at the beginning of the period	36,785	35,080	36,575	34,317
Net income	1,291	1,300	2,566	2,499
Other comprehensive income (loss), net of tax:
Dividends declared	(672)	(646)	(1,344)	(649)
Issuances pursuant to stock option and benefit plans	(210)	(119)	(603)	(552)
Balance at the end of the period	37,194	35,615	37,194	35,615
Treasury Stock
Increase (decrease) in equity
Balance at the beginning of the period	(23,716)	(19,458)	(23,308)	(19,307)
Other comprehensive income (loss), net of tax:
Reacquired stock	(837)	(1,787)	(2,000)	(2,683)
Issuances pursuant to stock option and benefit plans	465	262	1,220	1,007
Balance at the end of the period	(24,088)	(20,983)	(24,088)	(20,983)
Accumulated Other Comprehensive Income (Loss)
Increase (decrease) in equity
Balance at the beginning of the period	(6,261)	(6,321)	(6,359)	(6,289)
Other comprehensive income (loss), net of tax:
Cumulative translation adjustment	37	24	176	(169)
Defined benefit pension and postretirement plans adjustment	67	96	136	187
Cash flow hedging instruments - unrealized gain (loss)	(27)	(32)	(137)	38
Balance at the end of the period	(6,184)	(6,233)	(6,184)	(6,233)
Noncontrolling Interest
Increase (decrease) in equity
Balance at the beginning of the period	41	35	39	33
Net income	2	3	5	5
Other comprehensive income (loss), net of tax:
Cumulative translation adjustment		(1)	(1)	(1)
Balance at the end of the period	$ 43	$ 37	$ 43	$ 37