Shareowners' Equity and Noncontrolling Interest (Summary of Changes in Shareowners' Equity and Noncontrolling Interest) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Shareowners' Equity, beginning of period	$ 27,579	$ 27,358
Noncontrolling interest, beginning of period	1,590	1,486
Total Equity, beginning of period	29,169	28,844
Net income, Shareowners' Equity	1,386	1,183
Net Income, Noncontrolling Interest	82	81
Net income, Total Equity	1,468	1,264
Total other comprehensive (loss) income, Shareowners' Equity	1	275
Total other comprehensive income (loss), Noncontrolling Interest	25	13
Total other comprehensive (loss) income	26	288
Total comprehensive income for the period, Shareowners' Equity	1,387	1,458
Total comprehensive income for the period, Noncontrolling Interest	107	94
Total comprehensive income for the period, Total Equity	1,494	1,552
Common Stock issued under employee plans	79	59
Common Stock repurchased	933	0
Dividends on Common Stock	505	509
Dividends on ESOP Common Stock	18	18
Dividends attributable to noncontrolling interest	5	51
Purchase of subsidiary shares from noncontrolling interest	1	1
Acquisition of noncontrolling interest	0	34
Other	8	7
Shareowners' Equity, end of period	27,594	28,353
Noncontrolling interest, end of period	1,678	1,550
Total Equity, end of period	29,272	29,903
Shareowners' Equity [Member]
Purchase of subsidiary shares from noncontrolling interest	0	0
Other	(5)	(5)
Noncontrolling Interest [Member]
Purchase of subsidiary shares from noncontrolling interest	1	1
Other	$ 13	$ 12