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Summary of Information Relating to Options Outstanding and Exercisable (Details) - $ / shares
shares in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Outstanding as of 12/31/2017 16.1      
Weighted Average Remaining Contractual Life 5 years 4 months 24 days      
Options Outstanding Weighted-Average Exercise Price $ 33.11 $ 30.06 $ 25.89 $ 22.75
Exercisable as of 12/31/2017 10.0      
Options Exercisable Weighted-Average Exercise Price $ 25.35      
$0.01 - $15.00        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Range of Exercise Prices, Lower Limit 0.01      
Range of Exercise Prices, Upper Limit $ 15.00      
Outstanding as of 12/31/2017 1.9      
Weighted Average Remaining Contractual Life 1 year 7 months 6 days      
Options Outstanding Weighted-Average Exercise Price $ 12.73      
Exercisable as of 12/31/2017 1.7      
Options Exercisable Weighted-Average Exercise Price $ 13.69      
$15.01 - $20.00        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Range of Exercise Prices, Lower Limit 15.01      
Range of Exercise Prices, Upper Limit $ 20.00      
Outstanding as of 12/31/2017 1.0      
Weighted Average Remaining Contractual Life 2 years 4 months 24 days      
Options Outstanding Weighted-Average Exercise Price $ 16.68      
Exercisable as of 12/31/2017 1.0      
Options Exercisable Weighted-Average Exercise Price $ 16.68      
$20.01 - $25.00        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Range of Exercise Prices, Lower Limit 20.01      
Range of Exercise Prices, Upper Limit $ 25.00      
Outstanding as of 12/31/2017 1.2      
Weighted Average Remaining Contractual Life 3 years 4 months 24 days      
Options Outstanding Weighted-Average Exercise Price $ 20.32      
Exercisable as of 12/31/2017 1.2      
Options Exercisable Weighted-Average Exercise Price $ 20.32      
$25.01 - $30.00        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Range of Exercise Prices, Lower Limit 25.01      
Range of Exercise Prices, Upper Limit $ 30.00      
Outstanding as of 12/31/2017 1.9      
Weighted Average Remaining Contractual Life 4 years 2 months 12 days      
Options Outstanding Weighted-Average Exercise Price $ 26.92      
Exercisable as of 12/31/2017 1.9      
Options Exercisable Weighted-Average Exercise Price $ 26.92      
$30.01 - $35.00        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Range of Exercise Prices, Lower Limit 30.01      
Range of Exercise Prices, Upper Limit $ 35.00      
Outstanding as of 12/31/2017 4.2      
Weighted Average Remaining Contractual Life 5 years 6 months      
Options Outstanding Weighted-Average Exercise Price $ 32.69      
Exercisable as of 12/31/2017 4.2      
Options Exercisable Weighted-Average Exercise Price $ 32.69      
$35.01 - $40.00        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Range of Exercise Prices, Lower Limit 35.01      
Range of Exercise Prices, Upper Limit $ 40.00      
Outstanding as of 12/31/2017 0.0      
Weighted Average Remaining Contractual Life 6 years 8 months 12 days      
Options Outstanding Weighted-Average Exercise Price $ 35.59      
Exercisable as of 12/31/2017 0.0      
Options Exercisable Weighted-Average Exercise Price $ 35.59      
$40.01 - $45.00        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Range of Exercise Prices, Lower Limit 40.01      
Range of Exercise Prices, Upper Limit $ 45.00      
Outstanding as of 12/31/2017 2.8      
Weighted Average Remaining Contractual Life 7 years 1 month 6 days      
Options Outstanding Weighted-Average Exercise Price $ 41.88      
Exercisable as of 12/31/2017 0.0      
Options Exercisable Weighted-Average Exercise Price $ 0.0      
$45.01 - $50.00        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Range of Exercise Prices, Lower Limit 45.01      
Range of Exercise Prices, Upper Limit $ 50.00      
Outstanding as of 12/31/2017 1.3      
Weighted Average Remaining Contractual Life 8 years      
Options Outstanding Weighted-Average Exercise Price $ 49.20      
Exercisable as of 12/31/2017 0.0      
Options Exercisable Weighted-Average Exercise Price $ 0.0      
$50.01 - $55.00        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Range of Exercise Prices, Lower Limit 50.01      
Range of Exercise Prices, Upper Limit $ 55.00      
Outstanding as of 12/31/2017 1.8      
Weighted Average Remaining Contractual Life 9 years 2 months 12 days      
Options Outstanding Weighted-Average Exercise Price $ 53.64      
Exercisable as of 12/31/2017 0.0      
Options Exercisable Weighted-Average Exercise Price $ 0.0