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Per Share Data (Basic and Diluted EPS Calculation Continuing Operations) (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Earnings Per Share [Abstract]        
Net income before non-controlling interests $ 279 $ 397 $ 1,511 $ 1,482
Less: Net income attributable to non-controlling interests 3 4 14 19
Net income attributable to the Company $ 276 $ 393 $ 1,497 $ 1,463
Basic weighted average common shares outstanding (in shares) 504 512 506 514
Dilutive effect of potentially issuable common shares (in shares) 6 7 6 6
Diluted weighted average common shares outstanding (in shares) 510 519 512 520
Average stock price used to calculate common stock equivalents (in dollars per share) $ 84.68 $ 79.35 $ 83.05 $ 75.36