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Stock-Based Compensation Plans (Exercise Price Range) (Details)
12 Months Ended
Dec. 31, 2015
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Options Outstanding - Shares (in shares) | shares 8,771,600
Options Outstanding - Per share weighted-average exercise price (in dollars per share) $ 31.26
Options Outstanding - Weighted-average remaining contractual life 3 years 4 months 24 days
Options Exercisable - Shares (in shares) | shares 8,054,932
Options Exercisable - Per share weighted-average exercise price (in dollars per share) $ 32.14
Options Exercisable - Weighted-average remaining contractual life 2 years 10 months 24 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 2,290,103
Options Outstanding - Per share weighted-average exercise price (in dollars per share) $ 20.23
Options Outstanding - Weighted-average remaining contractual life 5 years 7 months 6 days
Options Exercisable - Shares (in shares) | shares 1,880,102
Options Exercisable - Per share weighted-average exercise price (in dollars per share) $ 20.50
Options Exercisable - Weighted-average remaining contractual life 5 years 3 months 18 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 2,538,566
Options Outstanding - Per share weighted-average exercise price (in dollars per share) $ 25.26
Options Outstanding - Weighted-average remaining contractual life 4 years 8 months 12 days
Options Exercisable - Shares (in shares) | shares 2,231,899
Options Exercisable - Per share weighted-average exercise price (in dollars per share) $ 25.36
Options Exercisable - Weighted-average remaining contractual life 4 years 1 month 6 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 3,311,665
Options Outstanding - Per share weighted-average exercise price (in dollars per share) $ 40.30
Options Outstanding - Weighted-average remaining contractual life 1 year 2 months 12 days
Options Exercisable - Shares (in shares) | shares 3,311,665
Options Exercisable - Per share weighted-average exercise price (in dollars per share) $ 40.30
Options Exercisable - Weighted-average remaining contractual life 1 year 2 months 12 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 631,266
Options Outstanding - Per share weighted-average exercise price (in dollars per share) $ 48.03
Options Outstanding - Weighted-average remaining contractual life 1 year 1 month 6 days
Options Exercisable - Shares (in shares) | shares 631,266
Options Exercisable - Per share weighted-average exercise price (in dollars per share) $ 48.03
Options Exercisable - Weighted-average remaining contractual life 1 year 1 month 6 days