Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Net income attributable to common shareowners:
Net income from continuing operations	$ 1,330	$ 1,443	$ 4,155	$ 4,041
Income from discontinued operations	0	37	0	1
Net income attributable to common shareowners	$ 1,330	$ 1,480	$ 4,155	$ 4,042
Basic weighted average number of shares outstanding	788.3	822.4	790.3	824.0
Stock awards and equity units	8.8	8.8	9.1	7.8
Diluted weighted average number of shares outstanding	797.1	831.2	799.4	831.8
Earnings Per Share of Common Stock - Basic:
Net income from continuing operations	$ 1.69	$ 1.76	$ 5.26	$ 4.90
Income from discontinued operations	0.00	0.04	0.00	0.00
Net income attributable to common shareowners	1.69	1.80	5.26	4.91
Earnings Per Share of Common Stock - Diluted:
Net income from continuing operations	1.67	1.74	5.20	4.86
Income from discontinued operations	0.00	0.04	0.00	0.00
Net income attributable to common shareowners	$ 1.67	$ 1.78	$ 5.20	$ 4.86
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	5.8	12.2	6.4	15.0