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Stock Incentive Plans - Schedule of Stock-based Compensation (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Compensation      
Compensation expense related to share-based compensation $ 234 $ 222 $ 230
Stock Options and ESPP      
Compensation      
Compensation expense related to share-based compensation 65 79 90
Restricted Stock      
Compensation      
Compensation expense related to share-based compensation $ 169 $ 143 140
Restricted Stock | Executive Officer      
Compensation      
Compensation expense related to share-based compensation     $ 38