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, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Shareowners' Equity, beginning of period	$ 28,442	$ 29,090	$ 27,579	$ 27,358
Noncontrolling interest, beginning of period	1,713	1,558	1,590	1,486
Total Equity, beginning of period	30,155	30,648	29,169	28,844
Net income, Shareowners' Equity	1,330	1,480	4,155	4,042
Net Income, Noncontrolling Interest	104	91	279	271
Net income, Total Equity	1,434	1,571	4,434	4,313
Total other comprehensive income (loss), Shareowners' Equity	637	(245)	1,007	(110)
Total other comprehensive income (loss), Noncontrolling Interest	40	5	83	16
Total other comprehensive income (loss)	677	(240)	1,090	(94)
Total comprehensive income for the period, Shareowners' Equity	1,967	1,235	5,162	3,932
Total comprehensive income for the period, Noncontrolling Interest	144	96	362	287
Total comprehensive income for the period, Total Equity	2,111	1,331	5,524	4,219
Common Stock issued under employee plans	86	54	256	200
Common Stock repurchased	60	649	1,430	685
Dividends on Common Stock	533	526	1,541	1,561
Dividends on ESOP Common Stock	19	19	54	56
Dividends attributable to noncontrolling interest	51	129	120	270
Sale of subsidiary shares from noncontrolling interest, net	(14)	(24)	(8)	(17)
Acquisition of noncontrolling interest	14	29	14	63
Redeemable noncontrolling interest fair value adjustment	4	0	99	0
Other	22	(1)	36	7
Shareowners' Equity, end of period	29,881	29,187	29,881	29,187
Noncontrolling interest, end of period	1,810	1,577	1,810	1,577
Total Equity, end of period	31,691	30,764	31,691	30,764
Shareowners' Equity
Sale of subsidiary shares from noncontrolling interest, net	(5)	(2)	(4)	4
Redeemable noncontrolling interest fair value adjustment	4	0	99
Other	3	0	(4)	(3)
Noncontrolling Interest
Sale of subsidiary shares from noncontrolling interest, net	(9)	(22)	(4)	(21)
Redeemable noncontrolling interest fair value adjustment	0	0	0	0
Other	$ 19	$ (1)	$ 40	$ 10