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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, 2016
Dec. 31, 2015
Dec. 31, 2014
Number of Shares (in shares):      
Beginning Balance (in shares) 5,702,000    
Granted (in shares) 1,212,600    
Vested (in shares) (2,302,525) (2,711,974) (3,974,560)
Forfeited (in shares) (111,085)    
Ending Balance (in shares) 4,500,990 5,702,000  
Weighted-Average Grant Date Fair Value:      
Beginning Balance (in dollars per share) $ 82.92    
Granted (in dollars per share) 89.03 $ 82.28 $ 77.79
Vested (in dollars per share) 87.81    
Forfeited (in dollars per share) 82.38    
Ending Balance (in dollars per share) $ 82.08 $ 82.92  
Total Weighted-Average Grant Date Fair Value of RSU Awards Granted $ 108 $ 126 $ 189
Compensation Expense related to RSU Awards 126 166 210
Grant Date Fair Value [Member]      
Weighted-Average Grant Date Fair Value:      
Grant Date Fair Value of RSU Awards Vested 202 217 255
Fair Value [Member]      
Weighted-Average Grant Date Fair Value:      
Grant Date Fair Value of RSU Awards Vested $ 210 $ 224 $ 320