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Weighted Average Shares Outstanding (Details) - shares
shares in Millions
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Weighted average shares outstanding - basic 1,376.5 1,365.4
Weighted Average Number Diluted Shares Outstanding Adjustment 20.2 24.8
Weighted average shares outstanding - assuming dilution 1,396.8 1,390.2
Stock Issued During Period, Shares, New Issues 6.0 7.0