Shareowners' Equity and Noncontrolling Interest (Summary of Changes in Shareowners' Equity and Noncontrolling Interest) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Shareowners' Equity, beginning of period	$ 27,358	$ 31,213
Noncontrolling interest, beginning of period	1,486	1,351
Total Equity, beginning of period	28,844	32,564
Net income attributable to common shareowners	1,191	1,426
Net Income, Noncontrolling Interest	(81)	(72)
Net income, Total Equity	1,272	1,498
Total other comprehensive income (loss), Shareowners' Equity	275	(550)
Total other comprehensive income (loss), Noncontrolling Interest	(13)	40
Total other comprehensive income (loss), Total Equity	288	(590)
Total comprehensive income for the period, Shareowners' Equity	1,466	876
Total comprehensive income for the period, Noncontrolling Interest	(94)	(32)
Total comprehensive income for the period, Total Equity	1,560	908
Common Stock issued under employee plans	51	125
Common Stock Repurchased	0	3,000
Dividends on Common Stock	509	553
Dividends on ESOP Common Stock	18	19
Dividends attributable to noncontrolling interest	51	55
(Purchase) sale of subsidiary shares from noncontrolling interest	1	(25)
Acquisition of noncontrolling interest	34	172
Disposition of noncontrolling interest	0	3
Stockholders' Equity, Other	7	(3)
Shareowners' Equity, end of period	28,353	28,650
Noncontrolling interest, end of period	1,550	1,517
Total Equity, end of period	29,903	30,167
Shareowners' Equity [Member]
(Purchase) sale of subsidiary shares from noncontrolling interest	0	(11)
Stockholders' Equity, Other	(5)	3
Noncontrolling Interest [Member]
(Purchase) sale of subsidiary shares from noncontrolling interest	1	(14)
Stockholders' Equity, Other	$ 12	$ (6)