Shareowners' Equity and Noncontrolling Interest (Summary of Changes in Shareowners' Equity and Noncontrolling Interest) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Shareowners' Equity, beginning of period	$ 27,594	$ 28,353	$ 27,579	$ 27,358
Noncontrolling interest, beginning of period	1,678	1,550	1,590	1,486
Total Equity, beginning of period	29,272	29,903	29,169	28,844
Net income, Shareowners' Equity	1,439	1,379	2,825	2,562
Net Income, Noncontrolling Interest	93	99	175	180
Net income, Total Equity	1,532	1,478	3,000	2,742
Total other comprehensive (loss) income, Shareowners' Equity	369	(140)	370	135
Total other comprehensive income (loss), Noncontrolling Interest	18	(2)	43	11
Total other comprehensive (loss) income	387	(142)	413	146
Total comprehensive income for the period, Shareowners' Equity	1,808	1,239	3,195	2,697
Total comprehensive income for the period, Noncontrolling Interest	111	97	218	191
Total comprehensive income for the period, Total Equity	1,919	1,336	3,413	2,888
Common Stock issued under employee plans	91	88	170	146
Common Stock repurchased	437	36	1,370	36
Dividends on Common Stock	503	526	1,008	1,035
Dividends on ESOP Common Stock	17	19	35	37
Dividends attributable to noncontrolling interest	64	90	69	141
Purchase of subsidiary shares from noncontrolling interest	5	6	6	7
Acquisition of noncontrolling interest			0	34
Redeemable noncontrolling interest fair value adjustment	94	3	95	3
Other	7	(1)	14	5
Shareowners' Equity, end of period	28,442	29,090	28,442	29,090
Noncontrolling interest, end of period	1,713	1,558	1,713	1,558
Total Equity, end of period	30,155	30,648	30,155	30,648
Shareowners' Equity [Member]
Purchase of subsidiary shares from noncontrolling interest	1	6	1	6
Redeemable noncontrolling interest fair value adjustment	94	3	95	3
Other	(1)	0	(7)	(6)
Noncontrolling Interest [Member]
Purchase of subsidiary shares from noncontrolling interest	4	0	5	1
Redeemable noncontrolling interest fair value adjustment	0	0	0	0
Other	$ 8	$ (1)	$ 21	$ 11