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Stock Plans (Activity for Restricted Stock Awards) (Details) - Restricted Stock Units (RSUs) [Member] - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Number of Shares (in shares):      
Beginning Balance (in shares) 4,500,990    
Granted (in shares) 1,210,210    
Vested (in shares) (2,022,856) (2,302,525) (2,711,974)
Forfeited (in shares) (75,944)    
Ending Balance (in shares) 3,612,400 4,500,990  
Weighted-Average Grant Date Fair Value:      
Beginning Balance (in dollars per share) $ 82.08    
Granted (in dollars per share) 98.59 $ 89.03 $ 82.28
Vested (in dollars per share) 78.19    
Forfeited (in dollars per share) 88.82    
Ending Balance (in dollars per share) $ 89.65 $ 82.08  
Total Weighted-Average Grant Date Fair Value of RSU Awards Granted $ 119 $ 108 $ 126
Compensation Expense related to RSU Awards 111 126 166
Grant Date Fair Value [Member]      
Weighted-Average Grant Date Fair Value:      
Grant Date Fair Value of RSU Awards Vested 158 202 217
Fair Value [Member]      
Weighted-Average Grant Date Fair Value:      
Grant Date Fair Value of RSU Awards Vested $ 208 $ 210 $ 224