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Stock Options and Incentive Plans (Stock Options Outstanding, Additional Info) (Details)
$ / shares in Units, shares in Thousands, $ in Millions
12 Months Ended
Dec. 31, 2015
USD ($)
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]  
Number of options (shares) | shares 1,852
Number of shares exercisable at December 31 (shares) | shares 1,295
Weighted-average exercise price per share | $ / shares $ 105.53
Weighted-Average Exercise Price Exercisable at December 31 (USD per share) | $ / shares $ 76.25
Aggregate intrinsic value | $ $ 94
Exercisable, intrinsic value | $ $ 92
Weighted-average remaining contractual term, in years 6 years
Weighted-average remaining contractual term, in years 5 years