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Stock Plans (Details 3) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Stock Based Compensation Expense [Abstract]      
Stock-based compensation expense $ 283 $ 252 $ 234
Stock Plans (Textuals) [Abstract]      
Total income tax benefit recognized in the income statement for stock-based compensation arrangements 102 89 83
Restricted Stock Awards [Member]      
Stock Based Compensation Expense [Abstract]      
Stock-based compensation expense 170 178 190
Stock Plans (Textuals) [Abstract]      
Total unrecognized compensation cost 178    
Stock Option [Member]      
Stock Based Compensation Expense [Abstract]      
Stock-based compensation expense 21 14 12
Stock Plans (Textuals) [Abstract]      
Total unrecognized compensation cost $ 21    
Weighted-average remaining vesting period 2 years 1 month    
Liability-Based Awards [Member]      
Stock Based Compensation Expense [Abstract]      
Stock-based compensation expense $ 92 $ 60 $ 32