Shareowners' Equity and Noncontrolling Interest (Summary of Changes in Shareowners' Equity and Noncontrolling Interest) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013
Equity, beginning of period	$ 33,219	$ 27,069
Net income	1,306	1,348
Total other comprehensive income (loss)	(68)	(440)
Total comprehensive income for the period	1,238	908
Common Stock issued under employee plans	165	251
Common Stock repurchased	(335)	(335)
Dividends on Common Stock	(514)	(465)
Dividends on ESOP Common Stock	(18)	(17)
Dividends attributable to noncontrolling interest	(56)	(56)
Purchase of subsidiary shares from noncontrolling interest	(3)	(10)
Noncontrolling Interest, Increase from Subsidiary Equity Issuance	28	237
Redeemable Noncontrolling Interest in Subsidiaries Earning	(6)	0
Redeemable noncontrolling interest in other comprehensive income (loss)	2	4
Redeemable noncontrolling interest reclassification to noncontrolling interest	(25)	(23)
Equity, end of period	33,695	27,563
Redeemable noncontrolling interest, beginning of period	111	238
Redeemable noncontrolling interest, end of period	137	255
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Changes, Sale of Interest by Parent	4	0
Transfers to noncontrolling interests - Decrease in common stock for purchase of subsidiary shares	(3)	(1)
Change from net income attributable to common shareowners and transfers to noncontrolling interest	1,214	1,265
Accumulated other comprehensive loss	(2,941)		(2,880)
Shareowners' Equity [Member]
Equity, beginning of period	31,866	25,914
Net income	1,213	1,266
Total other comprehensive income (loss)	(61)	(419)
Total comprehensive income for the period	1,152	847
Common Stock issued under employee plans	165	251
Common Stock repurchased	(335)	(335)
Dividends on Common Stock	(514)	(465)
Dividends on ESOP Common Stock	(18)	(17)
Purchase of subsidiary shares from noncontrolling interest	(3)	(1)
Noncontrolling Interest, Increase from Subsidiary Equity Issuance	4	0
Equity, end of period	32,317	26,194
Noncontrolling Interest [Member]
Equity, beginning of period	1,353	1,155
Net Income (Loss) Attributable to Noncontrolling Interest	93	82
Total other comprehensive income (loss)	(7)	(21)
Total comprehensive income for the period	86	61
Dividends attributable to noncontrolling interest	(56)	(56)
Purchase of subsidiary shares from noncontrolling interest	0	(9)
Noncontrolling Interest, Increase from Subsidiary Equity Issuance	24	237
Redeemable Noncontrolling Interest in Subsidiaries Earning	(6)	0
Redeemable noncontrolling interest in other comprehensive income (loss)	2	4
Redeemable noncontrolling interest reclassification to noncontrolling interest	(25)	(23)
Equity, end of period	1,378	1,369
Redeemable Noncontrolling Interest [Member]
Net income	6	0
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	(2)	(4)
Dividends attributable to noncontrolling interest	(3)	(2)
Redeemable noncontrolling interest reclassification to noncontrolling interest	$ 25	$ 23