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, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Shareowners' Equity, beginning of period	$ 30,534	$ 27,594	$ 29,610	$ 27,579
Noncontrolling interest, beginning of period	1,958	1,678	1,811	1,590
Total Equity, beginning of period	32,492	29,272	31,421	29,169
Net income, Shareowners' Equity	2,048	1,439	3,345	2,825
Net Income, Noncontrolling Interest	91	93	162	175
Net income, Total Equity	2,139	1,532	3,507	3,000
Total other comprehensive income (loss), Shareowners' Equity	(747)	369	(159)	370
Total other comprehensive income (loss), Noncontrolling Interest	(38)	18	(5)	43
Total other comprehensive income (loss)	(785)	387	(164)	413
Total comprehensive income for the period, Shareowners' Equity	1,301	1,808	3,186	3,195
Total comprehensive income for the period, Noncontrolling Interest	53	111	157	218
Total comprehensive income for the period, Total Equity	1,354	1,919	3,343	3,413
Common Stock issued under employee plans	110	91	181	170
Common Stock repurchased	27	437	52	1,370
Dividends on Common Stock	535	503	1,070	1,008
Dividends on ESOP Common Stock	17	17	35	35
Dividends attributable to noncontrolling interest	73	64	139	112
Noncontrolling Interest, Increase from Capital Contributions	42	0	162	43
Purchase of subsidiary shares from noncontrolling interest, net	0	5	2	6
Non-controlling interest, decrease from disposition of non-controlling interest			8	0
Redeemable noncontrolling interest fair value adjustment	0	94	2	95
Other	0	7	(27)	14
Shareowners' Equity, end of period	31,364	28,442	31,364	28,442
Noncontrolling interest, end of period	1,982	1,713	1,982	1,713
Total Equity, end of period	33,346	30,155	33,346	30,155
Shareowners' Equity
Purchase of subsidiary shares from noncontrolling interest, net	0	1	1	1
Redeemable noncontrolling interest fair value adjustment	0	94	2	95
Other	2	(1)	(27)	(7)
Noncontrolling Interest
Purchase of subsidiary shares from noncontrolling interest, net	0	4	1	5
Redeemable noncontrolling interest fair value adjustment	0	0	0	0
Other	$ (2)	$ 8	0	21
Accounting Standards Update 2014-09 [Member]
Other			$ 480	$ 0