Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Net income attributable to common shareowners:
Net income from continuing operations	$ 1,297	$ 1,386
Net income attributable to common shareowners	$ 1,297	$ 1,386
Basic weighted average number of shares outstanding	789.9	793.5
Stock awards and equity units	10.5	8.8
Diluted weighted average number of shares outstanding	800.4	802.3
Earnings Per Share of Common Stock - Basic:
Net income from continuing operations	$ 1.64	$ 1.75
Net income attributable to common shareowners	1.64	1.75
Earnings Per Share of Common Stock - Diluted:
Net income from continuing operations	1.62	1.73
Net income attributable to common shareowners	$ 1.62	$ 1.73
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	4.3	12.2