Shareowners' Equity and Noncontrolling Interest (Summary of Changes in Shareowners' Equity and Noncontrolling Interest) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Shareowners' Equity, beginning of period	$ 29,090	$ 30,377	$ 27,358	$ 31,213
Noncontrolling interest, beginning of period	1,558	1,561	1,486	1,351
Total Equity, beginning of period	30,648	31,938	28,844	32,564
Net income, Shareowners' Equity	1,480	1,362	4,042	4,330
Net Income, Noncontrolling Interest	91	99	(271)	(281)
Net income, Total Equity	1,571	1,461	4,313	4,611
Total other comprehensive (loss) income, Shareowners' Equity	(245)	(811)	(110)	(727)
Total other comprehensive income (loss), Noncontrolling Interest	5	(23)	(16)	63
Total other comprehensive (loss) income	(240)	(834)	(94)	(790)
Total comprehensive income for the period, Shareowners' Equity	1,235	551	3,932	3,603
Total comprehensive income for the period, Noncontrolling Interest	96	76	287	218
Total comprehensive income for the period, Total Equity	1,331	627	4,219	3,821
Common Stock issued - equity unit remarketing	0	1,100	0	1,100
Common Stock issued under employee plans	54	65	200	302
Common Stock repurchased	649	1,000	685	4,000
Dividends on Common Stock	526	547	1,561	1,643
Dividends on ESOP Common Stock	19	19	56	56
Dividends attributable to noncontrolling interest	129	113	270	229
(Purchase) / sale of subsidiary shares from noncontrolling interest	(24)	(1)	(17)	(22)
Acquisition of noncontrolling interest	29	0	63	173
Disposition of noncontrolling interest			0	3
Other	(1)	1	7	0
Shareowners' Equity, end of period	29,187	30,525	29,187	30,525
Noncontrolling interest, end of period	1,577	1,526	1,577	1,526
Total Equity, end of period	30,764	32,051	30,764	32,051
Shareowners' Equity [Member]
(Purchase) / sale of subsidiary shares from noncontrolling interest	(2)	(1)	4	(12)
Other	0	3	(3)	6
Noncontrolling Interest [Member]
(Purchase) / sale of subsidiary shares from noncontrolling interest	(22)	0	(21)	(10)
Other	$ (1)	$ (2)	$ 10	$ (6)