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Stock Compensation Plans - Textual (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award      
Potential shares of common stock issued under current stock compensation plan 11,000,000    
Common stock shares 1    
Number of shares that count towards shares authorized limit 1.61    
Days after termination of employment 90 days    
Aggregate intrinsic value of options exercised $ 40 $ 37 $ 23
Other options exercise price range, lower range limit $ 6.22    
Other options exercise price range, upper range limit 36.25    
Weighted average exercise price, other options outstanding 17.15 $ 16.75  
Weighted average exercise price, other options exercisable $ 15.55    
Weighted average remaining contractual term, other options outstanding (in years) 5 years 9 months 18 days    
Weighted average remaining contractual term, other options exercisable (in years) 4 years 8 months 12 days    
Unvested portion of all stock-based awards $ 32    
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term [1] 7 years 3 months 18 days 7 years 4 months 23 days 6 years 3 months
Minimum      
Share-based Compensation Arrangement by Share-based Payment Award      
Percentage of units earned to units granted   0.00% 0.00%
Maximum      
Share-based Compensation Arrangement by Share-based Payment Award      
Percentage of units earned to units granted   200.00% 200.00%
All Other Grant Dates      
Share-based Compensation Arrangement by Share-based Payment Award      
Weighted average exercise price, other options outstanding $ 18.65    
Weighted average exercise price, other options exercisable $ 16.63    
Weighted average remaining contractual term, other options outstanding (in years) 6 years 1 month 6 days    
Weighted average remaining contractual term, other options exercisable (in years) 5 years    
Restricted Stock Units      
Share-based Compensation Arrangement by Share-based Payment Award      
Vesting period 3 years    
Employee Stock Option and Stock Appreciation Rights      
Share-based Compensation Arrangement by Share-based Payment Award      
Vesting period 4 years    
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term 10 years    
Performance Share Units      
Share-based Compensation Arrangement by Share-based Payment Award      
Award performance period 3 years    
Performance Share Units | Minimum      
Share-based Compensation Arrangement by Share-based Payment Award      
Percentage of units earned to units granted 0.00%    
Performance Share Units | Maximum      
Share-based Compensation Arrangement by Share-based Payment Award      
Percentage of units earned to units granted 200.00%    
Year 1      
Share-based Compensation Arrangement by Share-based Payment Award      
Vesting percentage 25.00%    
Year 2      
Share-based Compensation Arrangement by Share-based Payment Award      
Vesting percentage 50.00%    
Year 3      
Share-based Compensation Arrangement by Share-based Payment Award      
Vesting percentage 75.00%    
Year 4      
Share-based Compensation Arrangement by Share-based Payment Award      
Vesting percentage 100.00%    
[1] We review the assumptions used in our Black-Scholes model in conjunction with estimating the grant date fair value of the annual grants of options by our Board of Directors.