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Shareholders' Equity - Accelerated Share Repurchase Activity and Related Information (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
2 Months Ended 3 Months Ended 4 Months Ended 6 Months Ended
Jul. 01, 2017
Jul. 01, 2017
Apr. 01, 2017
May 31, 2017
Feb. 28, 2017
Nov. 30, 2016
Aug. 31, 2016
Apr. 30, 2016
May 2017 ASR                
Accelerated Share Repurchases [Line Items]                
Stock repurchase program completion date 2017-08              
Number of shares repurchased (in shares) 15,598              
ASR amount $ 3,000              
February 2017 ASR                
Accelerated Share Repurchases [Line Items]                
Stock repurchase program completion date       2017-05        
Number of shares repurchased (in shares)   3,400 17,500 20,949        
Average repurchase price per share (in dollars per share)       $ 143.20        
ASR amount       $ 3,000        
November 2016 ASR                
Accelerated Share Repurchases [Line Items]                
Stock repurchase program completion date         2017-02      
Number of shares repurchased (in shares)         51,157      
Average repurchase price per share (in dollars per share)         $ 117.29      
ASR amount         $ 6,000      
August 2016 ASR                
Accelerated Share Repurchases [Line Items]                
Stock repurchase program completion date           2016-11    
Number of shares repurchased (in shares)           26,850    
Average repurchase price per share (in dollars per share)           $ 111.73    
ASR amount           $ 3,000    
May 2016 ASR                
Accelerated Share Repurchases [Line Items]                
Stock repurchase program completion date             2016-08  
Number of shares repurchased (in shares)             60,452  
Average repurchase price per share (in dollars per share)             $ 99.25  
ASR amount             $ 6,000  
November 2015 ASR                
Accelerated Share Repurchases [Line Items]                
Stock repurchase program completion date               2016-04
Number of shares repurchased (in shares)               29,122
Average repurchase price per share (in dollars per share)               $ 103.02
ASR amount               $ 3,000