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Earnings Per Share (EPS) (Weighted-average Shares Outstanding for Basic and Diluted EPS) (Details) - shares
shares in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]      
Shares for basic EPS(1) 280.0 286.5 291.1
Effect of dilutive securities 0.2 0.3 0.3
Shares for diluted EPS 280.2 286.8 291.4
Shares for Basic EPS, Participating Securities 2.7 2.9 3.5