Per Share Data (Basic and Diluted EPS Calculation Continuing Operations) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Earnings Per Share [Abstract]
Net income before non-controlling interests	$ 696	$ 578
Less: Net income attributable to non-controlling interests	6	9
Net income attributable to the Company	$ 690	$ 569
Basic weighted average common shares outstanding (in shares)	508.0	515.0
Dilutive effect of potentially issuable common shares (in shares)	6.0	7.0
Diluted weighted average common shares outstanding (in shares)	514.0	522.0
Average stock price used to calculate common stock equivalents (in dollars per share)	$ 82.83	$ 71.32
Stock options outstanding (in shares)	10.6	12.8