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Other Financial Data (Stockholders' Equity) (Details) - USD ($)
$ / shares in Units, shares in Millions
3 Months Ended 12 Months Ended 65 Months Ended
Nov. 03, 2016
Nov. 02, 2016
Dec. 31, 2016
Oct. 01, 2016
Jul. 02, 2016
Apr. 02, 2016
Dec. 31, 2015
Oct. 03, 2015
Jul. 04, 2015
Apr. 04, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2016
Aug. 03, 2016
Equity, Class of Treasury Stock [Line Items]                              
Share repurchase program, maximum amount                             $ 14,000,000,000
Share repurchase authority utilized during period                           $ 11,800,000,000  
Share repurchase program, available for repurchases     $ 2,200,000,000               $ 2,200,000,000     $ 2,200,000,000  
Payments for repurchase of common stock                     $ 842,000,000 $ 3,177,000,000 $ 2,546,000,000    
Stock repurchased and retired during period (in shares)                     12.0 48.0 39.4    
Repurchase of common shares, average cost per share (US$ per share)                     $ 70.28 $ 66.22 $ 64.63    
Dividends declared per share (US$ per share) $ 0.47 $ 0.41 $ 0.47 $ 0.41 $ 0.41 $ 0.41 $ 0.41 $ 0.34 $ 0.34 $ 0.34 $ 1.70 $ 1.43 $ 1.30    
Payment of dividends                     $ 280,000,000 $ 277,000,000 $ 318,000,000    
Shares Repurchased due to Tender Offer                              
Equity, Class of Treasury Stock [Line Items]                              
Payments for repurchase of common stock                       $ 2,000,000,000      
Stock repurchased and retired during period (in shares)                       30.1      
Repurchase of common shares, average cost per share (US$ per share)                       $ 66.50