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, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Shareowners' Equity, beginning of period	$ 31,364	$ 28,442	$ 29,610	$ 27,579
Noncontrolling interest, beginning of period	1,982	1,713	1,811	1,590
Total Equity, beginning of period	33,346	30,155	31,421	29,169
Net income, Shareowners' Equity	1,238	1,330	4,583	4,155
Net Income, Noncontrolling Interest	111	104	273	279
Net income, Total Equity	1,349	1,434	4,856	4,434
Total other comprehensive income (loss), Shareowners' Equity	(39)	637	(198)	1,007
Total other comprehensive income (loss), Noncontrolling Interest	(19)	40	(24)	83
Total other comprehensive income (loss)	(58)	677	(222)	1,090
Total comprehensive income for the period, Shareowners' Equity	1,199	1,967	4,385	5,162
Total comprehensive income for the period, Noncontrolling Interest	92	144	249	362
Total comprehensive income for the period, Total Equity	1,291	2,111	4,634	5,524
Common Stock issued under employee plans	125	86	306	256
Common Stock repurchased	23	60	75	1,430
Dividends on Common Stock	536	533	1,606	1,541
Dividends on ESOP Common Stock	18	19	53	54
Dividends attributable to noncontrolling interest	73	105	212	217
Noncontrolling Interest, Increase from Capital Contributions	138	54	300	97
Purchase (sale) of subsidiary shares from noncontrolling interest, net	0	(14)	2	(8)
Noncontrolling Interest, Increase from Business Combination	0	14	0	14
Non-controlling interest, decrease from disposition of non-controlling interest			8	0
Redeemable noncontrolling interest fair value adjustment	6	4	8	99
Other	(6)	22	(33)	36
Shareowners' Equity, end of period	32,106	29,881	32,106	29,881
Noncontrolling interest, end of period	2,144	1,810	2,144	1,810
Total Equity, end of period	34,250	31,691	34,250	31,691
Shareowners' Equity
Purchase (sale) of subsidiary shares from noncontrolling interest, net	0	(5)	1	(4)
Redeemable noncontrolling interest fair value adjustment	6	4	8	99
Other	(1)	3	(28)	(4)
Noncontrolling Interest
Purchase (sale) of subsidiary shares from noncontrolling interest, net	0	(9)	1	(4)
Redeemable noncontrolling interest fair value adjustment	0	0	0	0
Other	$ (5)	$ 19	(5)	40
Accounting Standards Update 2014-09 [Member]
Other			$ 480	$ 0