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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
Apr. 01, 2017
Apr. 01, 2017
Dec. 31, 2016
Feb. 28, 2017
Nov. 30, 2016
Aug. 31, 2016
Apr. 30, 2016
February 2017 ASR              
Accelerated Share Repurchases [Line Items]              
Stock repurchase program completion date 2017-05            
Number of shares repurchased (in shares) 17,527            
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)   6,300 44,800 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