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Per Common Share Information	3 Months Ended
Per Common Share Information	Mar. 31, 2016
Earnings Per Share [Abstract]
Per Common Share Information	Per Common Share Information Diluted earnings per common share is calculated using net income divided by diluted weighted-average shares. Diluted weighted-average shares include weighted-average shares outstanding plus the dilutive effect of share-based compensation, calculated using the treasury stock method, of 6.0 million shares and 4.9 million shares for the first quarter 2016 and 2015, respectively. Stock options that would have been antidilutive, and therefore were not included in the calculation of diluted weighted-average shares, totaled 4.2 million shares and 12.7 million shares for the first quarter 2016 and 2015, respectively. In the first quarter of 2016, the Company paid $2.7 billion under an Accelerated Share Repurchase agreement and received an initial delivery of 18.5 million shares, which represents 80% of the total shares the Company expects to receive based on the market price at the time of initial delivery. The final number of shares delivered upon settlement of the agreement, between April 1, 2016 and May 13, 2016, will be determined with reference to the volume weighted average price per share of the Company's common stock over the term of the agreement, less a negotiated discount. The transaction is accounted for as an equity transaction and is included in Treasury stock when the shares are received, at which time there is an immediate reduction in the weighted average common shares calculation for basic and diluted earnings per share.