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Stock-Based Compensation Plans (Exercise Price Range) (Details)
12 Months Ended
Dec. 31, 2016
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Options Outstanding - Shares (in shares) | shares 9,122,762
Options Outstanding - Per share weighted-average exercise price (in dollars per share) $ 27.13
Options Outstanding - Weighted-average remaining contractual life 4 years 1 month 6 days
Options Exercisable - Shares (in shares) | shares 7,140,772
Options Exercisable - Per share weighted-average exercise price (in dollars per share) $ 29.66
Options Exercisable - Weighted-average remaining contractual life 2 years 8 months 12 days
$13.39 - $22.99  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Range of per share exercise prices, lower range (in dollars per share) $ 13.39
Range of per share exercise prices, upper range (in dollars per share) $ 22.99
Options Outstanding - Shares (in shares) | shares 3,926,391
Options Outstanding - Per share weighted-average exercise price (in dollars per share) $ 18.82
Options Outstanding - Weighted-average remaining contractual life 6 years 6 months
Options Exercisable - Shares (in shares) | shares 2,197,735
Options Exercisable - Per share weighted-average exercise price (in dollars per share) $ 20.22
Options Exercisable - Weighted-average remaining contractual life 4 years 7 months 6 days
$23.00 - $30.99  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Range of per share exercise prices, lower range (in dollars per share) $ 23.00
Range of per share exercise prices, upper range (in dollars per share) $ 30.99
Options Outstanding - Shares (in shares) | shares 2,511,223
Options Outstanding - Per share weighted-average exercise price (in dollars per share) $ 25.26
Options Outstanding - Weighted-average remaining contractual life 3 years 9 months 18 days
Options Exercisable - Shares (in shares) | shares 2,257,889
Options Exercisable - Per share weighted-average exercise price (in dollars per share) $ 25.33
Options Exercisable - Weighted-average remaining contractual life 3 years 2 months 23 days
$31.00 - $45.99  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Range of per share exercise prices, lower range (in dollars per share) $ 31.00
Range of per share exercise prices, upper range (in dollars per share) $ 45.99
Options Outstanding - Shares (in shares) | shares 2,055,824
Options Outstanding - Per share weighted-average exercise price (in dollars per share) $ 37.89
Options Outstanding - Weighted-average remaining contractual life 10 months 17 days
Options Exercisable - Shares (in shares) | shares 2,055,824
Options Exercisable - Per share weighted-average exercise price (in dollars per share) $ 38.90
Options Exercisable - Weighted-average remaining contractual life 10 months 17 days
$46.00 - $48.03  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Range of per share exercise prices, lower range (in dollars per share) $ 46.00
Range of per share exercise prices, upper range (in dollars per share) $ 48.03
Options Outstanding - Shares (in shares) | shares 629,324
Options Outstanding - Per share weighted-average exercise price (in dollars per share) $ 48.03
Options Outstanding - Weighted-average remaining contractual life 1 month 2 days
Options Exercisable - Shares (in shares) | shares 629,324
Options Exercisable - Per share weighted-average exercise price (in dollars per share) $ 48.00
Options Exercisable - Weighted-average remaining contractual life 10 months 24 days