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Weighted Average Shares Outstanding (Details) - shares
shares in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Weighted average shares outstanding - basic 1,372.0 1,360.6 1,369.1 1,356.1
Weighted Average Number Diluted Shares Outstanding Adjustment 22.1 19.1 22.7 18.8
Weighted average shares outstanding - assuming dilution 1,394.1 1,379.7 1,391.8 1,374.9
Stock Issued During Period, Shares, New Issues 2.0 3.0 11.0 15.0